# tzdb data for Europe and environs

# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.

# This file is by no means authoritative; if you think you know better,
# go ahead and edit the file, and please send any changes to
# the public mailing list tz@iana.org for general use in the future.
# For more, please see the file CONTRIBUTING in the tz distribution.

# From Paul Eggert (2017-02-10):
#
# Unless otherwise specified, the source for data through 1990 is:
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
# San Diego: ACS Publications, Inc. (2003).
# Unfortunately this book contains many errors and cites no sources.
#
# Many years ago Gwillim Law wrote that a good source
# for time zone data was the International Air Transport
# Association's Standard Schedules Information Manual (IATA SSIM),
# published semiannually.  Law sent in several helpful summaries
# of the IATA's data after 1990.  Except where otherwise noted,
# IATA SSIM is the source for entries after 1990.
#
# A reliable and entertaining source about time zones is
# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
#
# Except where otherwise noted, Shanks & Pottenger is the source for
# entries through 1991, and IATA SSIM is the source for entries afterwards.
#
# Other sources occasionally used include:
#
#	Edward W. Whitman, World Time Differences,
#	Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
#	which I found in the UCLA library.
#
#	William Willett, The Waste of Daylight, 19th edition
#	<http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
#	[PDF] (1914-03)
#
#	Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
#	<https://www.jstor.org/stable/1774359>.  He writes:
#	"It is requested that corrections and additions to these tables
#	may be sent to Mr. John Milne, Royal Geographical Society,
#	Savile Row, London."  Nowadays please see the file CONTRIBUTING.
#
#	Byalokoz EL. New Counting of Time in Russia since July 1, 1919.
#	This Russian-language source was consulted by Vladimir Karpinsky; see
#	https://mm.icann.org/pipermail/tz/2014-August/021320.html
#	The full Russian citation is:
#	Бялокоз, Евгений Людвигович. Новый счет времени в течении суток
#	введенный декретом Совета народных комиссаров для всей России с 1-го
#	июля 1919 г. / Изд. 2-е Междуведомственной комиссии. - Петроград:
#	Десятая гос. тип., 1919.
#	http://resolver.gpntb.ru/purl?docushare/dsweb/Get/Resource-2011/Byalokoz__E.L.__Novyy__schet__vremeni__v__techenie__sutok__izd__2(1).pdf
#
#	Brazil's Divisão de Serviços da Hora (DISHO)
#	History of Summer Time
#	<http://pcdsh01.on.br/HISTHV.htm>
#	(1998-09-21, in Portuguese)
#
# I invented the abbreviations marked '*' in the following table;
# the rest are variants of the "xMT" pattern for a city's mean time,
# or are from other sources.  Corrections are welcome!
#                   std  dst  2dst
#                   LMT             Local Mean Time
#       -4:00       AST  ADT        Atlantic
#        0:00       GMT  BST  BDST  Greenwich, British Summer
#        0:00       GMT  IST        Greenwich, Irish Summer
#        0:00       WET  WEST WEMT  Western Europe
#        1:00       BST             British Standard (1968-1971)
#        1:00       IST  GMT        Irish Standard (1968-) with winter DST
#        1:00       CET  CEST CEMT  Central Europe
#        1:00:14    SET             Swedish (1879-1899)
#        1:36:34    RMT* LST*       Riga, Latvian Summer (1880-1926)*
#        2:00       EET  EEST       Eastern Europe
#        3:00       MSK  MSD  MDST* Moscow

# From Peter Ilieve (1994-12-04), re EEC/EC/EU members:
# The original six: Belgium, France, (West) Germany, Italy,
# Luxembourg, the Netherlands.
# Plus, from 1 Jan 73: Denmark, Ireland, United Kingdom.
# Plus, from 1 Jan 81: Greece.
# Plus, from 1 Jan 86: Spain, Portugal.
# Plus, from 1 Jan 95: Austria, Finland, Sweden. (Norway negotiated terms for
# entry but in a referendum on 28 Nov 94 the people voted No by 52.2% to 47.8%
# on a turnout of 88.6%. This was almost the same result as Norway's previous
# referendum in 1972, they are the only country to have said No twice.
# Referendums in the other three countries voted Yes.)
# ...
# Estonia ... uses EU dates but not at 01:00 GMT, they use midnight GMT.
# I don't think they know yet what they will do from 1996 onwards.
# ...
# There shouldn't be any [current members who are not using EU rules].
# A Directive has the force of law, member states are obliged to enact
# national law to implement it. The only contentious issue was the
# different end date for the UK and Ireland, and this was always allowed
# in the Directive.


###############################################################################

# Britain (United Kingdom) and Ireland (Eire)

# From Peter Ilieve (1994-07-06):
#
# On 17 Jan 1994 the Independent, a UK quality newspaper, had a piece about
# historical vistas along the Thames in west London. There was a photo
# and a sketch map showing some of the sightlines involved. One paragraph
# of the text said:
#
# 'An old stone obelisk marking a forgotten terrestrial meridian stands
# beside the river at Kew. In the 18th century, before time and longitude
# was standardised by the Royal Observatory in Greenwich, scholars observed
# this stone and the movement of stars from Kew Observatory nearby. They
# made their calculations and set the time for the Horse Guards and Parliament,
# but now the stone is obscured by scrubwood and can only be seen by walking
# along the towpath within a few yards of it.'
#
# I have a one inch to one mile map of London and my estimate of the stone's
# position is 51° 28' 30" N, 0° 18' 45" W. The longitude should
# be within about ±2". The Ordnance Survey grid reference is TQ172761.
#
# [This yields STDOFF = -0:01:15 for London LMT in the 18th century.]

# From Paul Eggert (1993-11-18):
#
# Howse writes that Britain was the first country to use standard time.
# The railways cared most about the inconsistencies of local mean time,
# and it was they who forced a uniform time on the country.
# The original idea was credited to Dr. William Hyde Wollaston (1766-1828)
# and was popularized by Abraham Follett Osler (1808-1903).
# The first railway to adopt London time was the Great Western Railway
# in November 1840; other railways followed suit, and by 1847 most
# (though not all) railways used London time.  On 1847-09-22 the
# Railway Clearing House, an industry standards body, recommended that GMT be
# adopted at all stations as soon as the General Post Office permitted it.
# The transition occurred on 12-01 for the L&NW, the Caledonian,
# and presumably other railways; the January 1848 Bradshaw's lists many
# railways as using GMT.  By 1855 the vast majority of public
# clocks in Britain were set to GMT (though some, like the great clock
# on Tom Tower at Christ Church, Oxford, were fitted with two minute hands,
# one for local time and one for GMT).  The last major holdout was the legal
# system, which stubbornly stuck to local time for many years, leading
# to oddities like polls opening at 08:13 and closing at 16:13.
# The legal system finally switched to GMT when the Statutes (Definition
# of Time) Act took effect; it received the Royal Assent on 1880-08-02.
#
# In the tables below, we condense this complicated story into a single
# transition date for London, namely 1847-12-01.  We don't know as much
# about Dublin, so we use 1880-08-02, the legal transition time.

# From Paul Eggert (2014-07-19):
# The ancients had no need for daylight saving, as they kept time
# informally or via hours whose length depended on the time of year.
# Daylight saving time in its modern sense was invented by the
# New Zealand entomologist George Vernon Hudson (1867-1946),
# whose day job as a postal clerk led him to value
# after-hours daylight in which to pursue his research.
# In 1895 he presented a paper to the Wellington Philosophical Society
# that proposed a two-hour daylight-saving shift.  See:
# Hudson GV. On seasonal time-adjustment in countries south of lat. 30°.
# Transactions and Proceedings of the New Zealand Institute. 1895;28:734
# http://rsnz.natlib.govt.nz/volume/rsnz_28/rsnz_28_00_006110.html
# Although some interest was expressed in New Zealand, his proposal
# did not find its way into law and eventually it was almost forgotten.
#
# In England, DST was independently reinvented by William Willett (1857-1915),
# a London builder and member of the Royal Astronomical Society
# who circulated a pamphlet "The Waste of Daylight" (1907)
# that proposed advancing clocks 20 minutes on each of four Sundays in April,
# and retarding them by the same amount on four Sundays in September.
# A bill was drafted in 1909 and introduced in Parliament several times,
# but it met with ridicule and opposition, especially from farming interests.
# Later editions of the pamphlet proposed one-hour summer time, and
# it was eventually adopted as a wartime measure in 1916.
# See: Summer Time Arrives Early, The Times (2000-05-18).
# A monument to Willett was unveiled on 1927-05-21, in an open space in
# a 45-acre wood near Chislehurst, Kent that was purchased by popular
# subscription and open to the public.  On the south face of the monolith,
# designed by G. W. Miller, is the William Willett Memorial Sundial,
# which is permanently set to Summer Time.

# From Winston Churchill (1934-04-28):
# It is one of the paradoxes of history that we should owe the boon of
# summer time, which gives every year to the people of this country
# between 160 and 170 hours more daylight leisure, to a war which
# plunged Europe into darkness for four years, and shook the
# foundations of civilization throughout the world.
#	-- "A Silent Toast to William Willett", Pictorial Weekly;
#	republished in Finest Hour (Spring 2002) 1(114):26
#	https://www.winstonchurchill.org/publications/finest-hour/finest-hour-114/a-silent-toast-to-william-willett-by-winston-s-churchill

# From Paul Eggert (2015-08-08):
# The OED Supplement says that the English originally said "Daylight Saving"
# when they were debating the adoption of DST in 1908; but by 1916 this
# term appears only in quotes taken from DST's opponents, whereas the
# proponents (who eventually won the argument) are quoted as using "Summer".
# The term "Summer Time" was introduced by Herbert Samuel, Home Secretary; see:
# Viscount Samuel. Leisure in a Democracy. Cambridge University Press
# ISBN 978-1-107-49471-8 (1949, reissued 2015), p 8.

# From Arthur David Olson (1989-01-19):
# A source at the British Information Office in New York avers that it's
# known as "British" Summer Time in all parts of the United Kingdom.

# Date: 4 Jan 89 08:57:25 GMT (Wed)
# From: Jonathan Leffler
# [British Summer Time] is fixed annually by Act of Parliament.
# If you can predict what Parliament will do, you should be in
# politics making a fortune, not computing.

# From Chris Carrier (1996-06-14):
# I remember reading in various wartime issues of the London Times the
# acronym BDST for British Double Summer Time.  Look for the published
# time of sunrise and sunset in The Times, when BDST was in effect, and
# if you find a zone reference it will say, "All times B.D.S.T."

# From Joseph S. Myers (1999-09-02):
# ... some military cables (WO 219/4100 - this is a copy from the
# main SHAEF archives held in the US National Archives, SHAEF/5252/8/516)
# agree that the usage is BDST (this appears in a message dated 17 Feb 1945).

# From Joseph S. Myers (2000-10-03):
# On 18th April 1941, Sir Stephen Tallents of the BBC wrote to Sir
# Alexander Maxwell of the Home Office asking whether there was any
# official designation; the reply of the 21st was that there wasn't
# but he couldn't think of anything better than the "Double British
# Summer Time" that the BBC had been using informally.
# https://www.polyomino.org.uk/british-time/bbc-19410418.png
# https://www.polyomino.org.uk/british-time/ho-19410421.png

# From Sir Alexander Maxwell (1941-04-21) in the letter mentioned above:
# [N]o official designation has as far as I know been adopted for the time
# which is to be introduced in May....
# I cannot think of anything better than "Double British Summer Time"
# which could not be said to run counter to any official description.

# From Paul Eggert (2000-10-02):
# Howse writes (p 157) 'DBST' too, but 'BDST' seems to have been common
# and follows the more usual convention of putting the location name first,
# so we use 'BDST'.

# Peter Ilieve (1998-04-19) described at length
# the history of summer time legislation in the United Kingdom.
# Since 1998 Joseph S. Myers has been updating
# and extending this list, which can be found in
# https://www.polyomino.org.uk/british-time/

# From Joseph S. Myers (1998-01-06):
#
# The legal time in the UK outside of summer time is definitely GMT, not UTC;
# see Lord Tanlaw's speech
# https://www.publications.parliament.uk/pa/ld199798/ldhansrd/vo970611/text/70611-10.htm#70611-10_head0
# (Lords Hansard 11 June 1997 columns 964 to 976).

# From Paul Eggert (2006-03-22):
#
# For lack of other data, follow Shanks & Pottenger for Eire in 1940-1948.
#
# Given Ilieve and Myers's data, the following claims by Shanks & Pottenger
# are incorrect:
#     * Wales did not switch from GMT to daylight saving time until
#	1921 Apr 3, when they began to conform with the rest of Great Britain.
# Actually, Wales was identical after 1880.
#     * Eire had two transitions on 1916 Oct 1.
# It actually just had one transition.
#     * Northern Ireland used single daylight saving time throughout WW II.
# Actually, it conformed to Britain.
#     * GB-Eire changed standard time to 1 hour ahead of GMT on 1968-02-18.
# Actually, that date saw the usual switch to summer time.
# Standard time was not changed until 1968-10-27 (the clocks didn't change).
#
# Here is another incorrect claim by Shanks & Pottenger:
#     * Jersey, Guernsey, and the Isle of Man did not switch from GMT
#	to daylight saving time until 1921 Apr 3, when they began to
#	conform with Great Britain.
# S.R.&O. 1916, No. 382 and HO 45/10811/312364 (quoted above) say otherwise.
#
# The following claim by Shanks & Pottenger is possible though doubtful;
# we'll ignore it for now.
#     * Dublin's 1971-10-31 switch was at 02:00, even though London's was 03:00.

# From Paul Eggert (2017-12-04):
#
# Dunsink Observatory (8 km NW of Dublin's center) was to Dublin as
# Greenwich was to London.  For example:
#
#   "Timeball on the ballast office is down.  Dunsink time."
#   -- James Joyce, Ulysses
#
# The abbreviation DMT stood for "Dublin Mean Time" or "Dunsink Mean Time";
# this being Ireland, opinions differed.
#
# Whitman says Dublin/Dunsink Mean Time was UT-00:25:21, which agrees
# with measurements of recent visitors to the Meridian Room of Dunsink
# Observatory; see Malone D. Dunsink and timekeeping. 2016-01-24.
# <https://www.maths.tcd.ie/~dwmalone/time/dunsink.html>.  Malone
# writes that the Nautical Almanac listed UT-00:25:22 until 1896, when
# it moved to UT-00:25:21.1 (I confirmed that the 1893 edition used
# the former and the 1896 edition used the latter).  Evidently the
# news of this change propagated slowly, as Milne 1899 still lists
# UT-00:25:22 and cites the International Telegraph Bureau.  As it is
# not clear that there was any practical significance to the change
# from UT-00:25:22 to UT-00:25:21.1 in civil timekeeping, omit this
# transition for now and just use the latter value.

# "Countess Markievicz ... claimed that the [1916] abolition of Dublin Mean Time
# was among various actions undertaken by the 'English' government that
# would 'put the whole country into the SF (Sinn Féin) camp'.  She claimed
# Irish 'public feeling (was) outraged by forcing of English time on us'."
# -- Parsons M. Dublin lost its time zone - and 25 minutes - after 1916 Rising.
# Irish Times 2014-10-27.
# https://www.irishtimes.com/news/politics/dublin-lost-its-time-zone-and-25-minutes-after-1916-rising-1.1977411

# From Joseph S. Myers (2005-01-26):
# Irish laws are available online at <http://www.irishstatutebook.ie>.
# These include various relating to legal time, for example:
#
# ZZA13Y1923.html ZZA12Y1924.html ZZA8Y1925.html ZZSIV20PG1267.html
#
# ZZSI71Y1947.html ZZSI128Y1948.html ZZSI23Y1949.html ZZSI41Y1950.html
# ZZSI27Y1951.html ZZSI73Y1952.html
#
# ZZSI11Y1961.html ZZSI232Y1961.html ZZSI182Y1962.html
# ZZSI167Y1963.html ZZSI257Y1964.html ZZSI198Y1967.html
# ZZA23Y1968.html ZZA17Y1971.html
#
# ZZSI67Y1981.html ZZSI212Y1982.html ZZSI45Y1986.html
# ZZSI264Y1988.html ZZSI52Y1990.html ZZSI371Y1992.html
# ZZSI395Y1994.html ZZSI484Y1997.html ZZSI506Y2001.html
#
# [These are all relative to the root, e.g., the first is
# <http://www.irishstatutebook.ie/ZZA13Y1923.html>.]
#
# (These are those I found, but there could be more.  In any case these
# should allow various updates to the comments in the europe file to cover
# the laws applicable in Ireland.)
#
# (Note that the time in the Republic of Ireland since 1968 has been defined
# in terms of standard time being GMT+1 with a period of winter time when it
# is GMT, rather than standard time being GMT with a period of summer time
# being GMT+1.)

# From Paul Eggert (1999-03-28):
# Clive Feather (<news:859845706.26043.0@office.demon.net>, 1997-03-31)
# reports that Folkestone (Cheriton) Shuttle Terminal uses Concession Time
# (CT), equivalent to French civil time.
# Julian Hill (<news:36118128.5A14@virgin.net>, 1998-09-30) reports that
# trains between Dollands Moor (the freight facility next door)
# and Frethun run in CT.
# My admittedly uninformed guess is that the terminal has two authorities,
# the French concession operators and the British civil authorities,
# and that the time depends on who you're talking to.
# If, say, the British police were called to the station for some reason,
# I would expect the official police report to use GMT/BST and not CET/CEST.
# This is a borderline case, but for now let's stick to GMT/BST.

# From an anonymous contributor (1996-06-02):
# The law governing time in Ireland is under Statutory Instrument SI 395/94,
# which gives force to European Union 7th Council Directive No. 94/21/EC.
# Under this directive, the Minister for Justice in Ireland makes appropriate
# regulations. I spoke this morning with the Secretary of the Department of
# Justice (tel +353 1 678 9711) who confirmed to me that the correct name is
# "Irish Summer Time", abbreviated to "IST".
#
# From Paul Eggert (2017-12-07):
# The 1996 anonymous contributor's goal was to determine the correct
# abbreviation for summer time in Dublin and so the contributor
# focused on the "IST", not on the "Irish Summer Time".  Though the
# "IST" was correct, the "Irish Summer Time" appears to have been an
# error, as Ireland's Standard Time (Amendment) Act, 1971 states that
# standard time in Ireland remains at UT +01 and is observed in
# summer, and that Greenwich mean time is observed in winter.  (Thanks
# to Derick Rethans for pointing out the error.)  That is, when
# Ireland amended the 1968 act that established UT +01 as Irish
# Standard Time, it left standard time unchanged and established GMT
# as a negative daylight saving time in winter.  So, in this database
# IST stands for Irish Summer Time for timestamps before 1968, and for
# Irish Standard Time after that.  See:
# http://www.irishstatutebook.ie/eli/1971/act/17/enacted/en/print

# Michael Deckers (2017-06-01) gave the following URLs for Ireland's
# Summer Time Act, 1925 and Summer Time Orders, 1926 and 1947:
# http://www.irishstatutebook.ie/eli/1925/act/8/enacted/en/print
# http://www.irishstatutebook.ie/eli/1926/sro/919/made/en/print
# http://www.irishstatutebook.ie/eli/1947/sro/71/made/en/print

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
# Summer Time Act, 1916
Rule	GB-Eire	1916	only	-	May	21	2:00s	1:00	BST
Rule	GB-Eire	1916	only	-	Oct	 1	2:00s	0	GMT
# S.R.&O. 1917, No. 358
Rule	GB-Eire	1917	only	-	Apr	 8	2:00s	1:00	BST
Rule	GB-Eire	1917	only	-	Sep	17	2:00s	0	GMT
# S.R.&O. 1918, No. 274
Rule	GB-Eire	1918	only	-	Mar	24	2:00s	1:00	BST
Rule	GB-Eire	1918	only	-	Sep	30	2:00s	0	GMT
# S.R.&O. 1919, No. 297
Rule	GB-Eire	1919	only	-	Mar	30	2:00s	1:00	BST
Rule	GB-Eire	1919	only	-	Sep	29	2:00s	0	GMT
# S.R.&O. 1920, No. 458
Rule	GB-Eire	1920	only	-	Mar	28	2:00s	1:00	BST
# S.R.&O. 1920, No. 1844
Rule	GB-Eire	1920	only	-	Oct	25	2:00s	0	GMT
# S.R.&O. 1921, No. 363
Rule	GB-Eire	1921	only	-	Apr	 3	2:00s	1:00	BST
Rule	GB-Eire	1921	only	-	Oct	 3	2:00s	0	GMT
# S.R.&O. 1922, No. 264
Rule	GB-Eire	1922	only	-	Mar	26	2:00s	1:00	BST
Rule	GB-Eire	1922	only	-	Oct	 8	2:00s	0	GMT
# The Summer Time Act, 1922
Rule	GB-Eire	1923	only	-	Apr	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1923	1924	-	Sep	Sun>=16	2:00s	0	GMT
Rule	GB-Eire	1924	only	-	Apr	Sun>=9	2:00s	1:00	BST
Rule	GB-Eire	1925	1926	-	Apr	Sun>=16	2:00s	1:00	BST
# The Summer Time Act, 1925
Rule	GB-Eire	1925	1938	-	Oct	Sun>=2	2:00s	0	GMT
Rule	GB-Eire	1927	only	-	Apr	Sun>=9	2:00s	1:00	BST
Rule	GB-Eire	1928	1929	-	Apr	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1930	only	-	Apr	Sun>=9	2:00s	1:00	BST
Rule	GB-Eire	1931	1932	-	Apr	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1933	only	-	Apr	Sun>=9	2:00s	1:00	BST
Rule	GB-Eire	1934	only	-	Apr	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1935	only	-	Apr	Sun>=9	2:00s	1:00	BST
Rule	GB-Eire	1936	1937	-	Apr	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1938	only	-	Apr	Sun>=9	2:00s	1:00	BST
Rule	GB-Eire	1939	only	-	Apr	Sun>=16	2:00s	1:00	BST
# S.R.&O. 1939, No. 1379
Rule	GB-Eire	1939	only	-	Nov	Sun>=16	2:00s	0	GMT
# S.R.&O. 1940, No. 172 and No. 1883
Rule	GB-Eire	1940	only	-	Feb	Sun>=23	2:00s	1:00	BST
# S.R.&O. 1941, No. 476
Rule	GB-Eire	1941	only	-	May	Sun>=2	1:00s	2:00	BDST
Rule	GB-Eire	1941	1943	-	Aug	Sun>=9	1:00s	1:00	BST
# S.R.&O. 1942, No. 506
Rule	GB-Eire	1942	1944	-	Apr	Sun>=2	1:00s	2:00	BDST
# S.R.&O. 1944, No. 932
Rule	GB-Eire	1944	only	-	Sep	Sun>=16	1:00s	1:00	BST
# S.R.&O. 1945, No. 312
Rule	GB-Eire	1945	only	-	Apr	Mon>=2	1:00s	2:00	BDST
Rule	GB-Eire	1945	only	-	Jul	Sun>=9	1:00s	1:00	BST
# S.R.&O. 1945, No. 1208
Rule	GB-Eire	1945	1946	-	Oct	Sun>=2	2:00s	0	GMT
Rule	GB-Eire	1946	only	-	Apr	Sun>=9	2:00s	1:00	BST
# The Summer Time Act, 1947
Rule	GB-Eire	1947	only	-	Mar	16	2:00s	1:00	BST
Rule	GB-Eire	1947	only	-	Apr	13	1:00s	2:00	BDST
Rule	GB-Eire	1947	only	-	Aug	10	1:00s	1:00	BST
Rule	GB-Eire	1947	only	-	Nov	 2	2:00s	0	GMT
# Summer Time Order, 1948 (S.I. 1948/495)
Rule	GB-Eire	1948	only	-	Mar	14	2:00s	1:00	BST
Rule	GB-Eire	1948	only	-	Oct	31	2:00s	0	GMT
# Summer Time Order, 1949 (S.I. 1949/373)
Rule	GB-Eire	1949	only	-	Apr	 3	2:00s	1:00	BST
Rule	GB-Eire	1949	only	-	Oct	30	2:00s	0	GMT
# Summer Time Order, 1950 (S.I. 1950/518)
# Summer Time Order, 1951 (S.I. 1951/430)
# Summer Time Order, 1952 (S.I. 1952/451)
Rule	GB-Eire	1950	1952	-	Apr	Sun>=14	2:00s	1:00	BST
Rule	GB-Eire	1950	1952	-	Oct	Sun>=21	2:00s	0	GMT
# revert to the rules of the Summer Time Act, 1925
Rule	GB-Eire	1953	only	-	Apr	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1953	1960	-	Oct	Sun>=2	2:00s	0	GMT
Rule	GB-Eire	1954	only	-	Apr	Sun>=9	2:00s	1:00	BST
Rule	GB-Eire	1955	1956	-	Apr	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1957	only	-	Apr	Sun>=9	2:00s	1:00	BST
Rule	GB-Eire	1958	1959	-	Apr	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1960	only	-	Apr	Sun>=9	2:00s	1:00	BST
# Summer Time Order, 1961 (S.I. 1961/71)
# Summer Time (1962) Order, 1961 (S.I. 1961/2465)
# Summer Time Order, 1963 (S.I. 1963/81)
Rule	GB-Eire	1961	1963	-	Mar	lastSun	2:00s	1:00	BST
Rule	GB-Eire	1961	1968	-	Oct	Sun>=23	2:00s	0	GMT
# Summer Time (1964) Order, 1963 (S.I. 1963/2101)
# Summer Time Order, 1964 (S.I. 1964/1201)
# Summer Time Order, 1967 (S.I. 1967/1148)
Rule	GB-Eire	1964	1967	-	Mar	Sun>=19	2:00s	1:00	BST
# Summer Time Order, 1968 (S.I. 1968/117)
Rule	GB-Eire	1968	only	-	Feb	18	2:00s	1:00	BST
# The British Standard Time Act, 1968
#	(no summer time)
# The Summer Time Act, 1972
Rule	GB-Eire	1972	1980	-	Mar	Sun>=16	2:00s	1:00	BST
Rule	GB-Eire	1972	1980	-	Oct	Sun>=23	2:00s	0	GMT
# Summer Time Order, 1980 (S.I. 1980/1089)
# Summer Time Order, 1982 (S.I. 1982/1673)
# Summer Time Order, 1986 (S.I. 1986/223)
# Summer Time Order, 1988 (S.I. 1988/931)
Rule	GB-Eire	1981	1995	-	Mar	lastSun	1:00u	1:00	BST
Rule	GB-Eire 1981	1989	-	Oct	Sun>=23	1:00u	0	GMT
# Summer Time Order, 1989 (S.I. 1989/985)
# Summer Time Order, 1992 (S.I. 1992/1729)
# Summer Time Order 1994 (S.I. 1994/2798)
Rule	GB-Eire 1990	1995	-	Oct	Sun>=22	1:00u	0	GMT
# Summer Time Order 1997 (S.I. 1997/2982)
# See EU for rules starting in 1996.
#
# Use Europe/London for Jersey, Guernsey, and the Isle of Man.

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/London	-0:01:15 -	LMT	1847 Dec  1
			 0:00	GB-Eire	%s	1968 Oct 27
			 1:00	-	BST	1971 Oct 31  2:00u
			 0:00	GB-Eire	%s	1996
			 0:00	EU	GMT/BST

# From Paul Eggert (2018-02-15):
# In January 2018 we discovered that the negative SAVE values in the
# Eire rules cause problems with tests for ICU:
# https://mm.icann.org/pipermail/tz/2018-January/025825.html
# and with tests for OpenJDK:
# https://mm.icann.org/pipermail/tz/2018-January/025822.html
#
# To work around this problem, the build procedure can translate the
# following data into two forms, one with negative SAVE values and the
# other form with a traditional approximation for Irish timestamps
# after 1971-10-31 02:00 UTC; although this approximation has tm_isdst
# flags that are reversed, its UTC offsets are correct and this often
# suffices....
#
# The following is like GB-Eire and EU, except with standard time in
# summer and negative daylight saving time in winter.  It is for when
# negative SAVE values are used.
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Eire	1971	only	-	Oct	31	 2:00u	-1:00	-
Rule	Eire	1972	1980	-	Mar	Sun>=16	 2:00u	0	-
Rule	Eire	1972	1980	-	Oct	Sun>=23	 2:00u	-1:00	-
Rule	Eire	1981	max	-	Mar	lastSun	 1:00u	0	-
Rule	Eire	1981	1989	-	Oct	Sun>=23	 1:00u	-1:00	-
Rule	Eire	1990	1995	-	Oct	Sun>=22	 1:00u	-1:00	-
Rule	Eire	1996	max	-	Oct	lastSun	 1:00u	-1:00	-

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
		#STDOFF	-0:25:21.1
Zone	Europe/Dublin	-0:25:21 -	LMT	1880 Aug  2
			-0:25:21 -	DMT	1916 May 21  2:00s
			-0:25:21 1:00	IST	1916 Oct  1  2:00s
			 0:00	GB-Eire	%s	1921 Dec  6 # independence
			 0:00	GB-Eire	GMT/IST	1940 Feb 25  2:00s
			 0:00	1:00	IST	1946 Oct  6  2:00s
			 0:00	-	GMT	1947 Mar 16  2:00s
			 0:00	1:00	IST	1947 Nov  2  2:00s
			 0:00	-	GMT	1948 Apr 18  2:00s
			 0:00	GB-Eire	GMT/IST	1968 Oct 27
# Vanguard section, for zic and other parsers that support negative DST.
			 1:00	Eire	IST/GMT
# Rearguard section, for parsers lacking negative DST; see ziguard.awk.
#			 1:00	-	IST	1971 Oct 31  2:00u
#			 0:00	GB-Eire	GMT/IST	1996
#			 0:00	EU	GMT/IST
# End of rearguard section.


###############################################################################

# Europe

# The following rules are for the European Union and for its
# predecessor organization, the European Communities.
# For brevity they are called "EU rules" elsewhere in this file.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	EU	1977	1980	-	Apr	Sun>=1	 1:00u	1:00	S
Rule	EU	1977	only	-	Sep	lastSun	 1:00u	0	-
Rule	EU	1978	only	-	Oct	 1	 1:00u	0	-
Rule	EU	1979	1995	-	Sep	lastSun	 1:00u	0	-
Rule	EU	1981	max	-	Mar	lastSun	 1:00u	1:00	S
Rule	EU	1996	max	-	Oct	lastSun	 1:00u	0	-
# The most recent directive covers the years starting in 2002.  See:
# Directive 2000/84/EC of the European Parliament and of the Council
# of 19 January 2001 on summer-time arrangements.
# http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32000L0084:EN:NOT

# W-Eur differs from EU only in that W-Eur uses standard time.
Rule	W-Eur	1977	1980	-	Apr	Sun>=1	 1:00s	1:00	S
Rule	W-Eur	1977	only	-	Sep	lastSun	 1:00s	0	-
Rule	W-Eur	1978	only	-	Oct	 1	 1:00s	0	-
Rule	W-Eur	1979	1995	-	Sep	lastSun	 1:00s	0	-
Rule	W-Eur	1981	max	-	Mar	lastSun	 1:00s	1:00	S
Rule	W-Eur	1996	max	-	Oct	lastSun	 1:00s	0	-

# Older C-Eur rules are for convenience in the tables.
# From 1977 on, C-Eur differs from EU only in that C-Eur uses standard time.
Rule	C-Eur	1916	only	-	Apr	30	23:00	1:00	S
Rule	C-Eur	1916	only	-	Oct	 1	 1:00	0	-
Rule	C-Eur	1917	1918	-	Apr	Mon>=15	 2:00s	1:00	S
Rule	C-Eur	1917	1918	-	Sep	Mon>=15	 2:00s	0	-
Rule	C-Eur	1940	only	-	Apr	 1	 2:00s	1:00	S
Rule	C-Eur	1942	only	-	Nov	 2	 2:00s	0	-
Rule	C-Eur	1943	only	-	Mar	29	 2:00s	1:00	S
Rule	C-Eur	1943	only	-	Oct	 4	 2:00s	0	-
Rule	C-Eur	1944	1945	-	Apr	Mon>=1	 2:00s	1:00	S
# Whitman gives 1944 Oct 7; go with Shanks & Pottenger.
Rule	C-Eur	1944	only	-	Oct	 2	 2:00s	0	-
# From Jesper Nørgaard Welen (2008-07-13):
#
# I found what is probably a typo of 2:00 which should perhaps be 2:00s
# in the C-Eur rule from tz database version 2008d (this part was
# corrected in version 2008d). The circumstantial evidence is simply the
# tz database itself, as seen below:
#
# Zone Europe/Paris ...
#    0:00 France WE%sT 1945 Sep 16  3:00
#
# Zone Europe/Monaco ...
#    0:00 France WE%sT 1945 Sep 16  3:00
#
# Zone Europe/Belgrade ...
#    1:00 1:00 CEST 1945 Sep 16  2:00s
#
# Rule France 1945 only - Sep 16  3:00 0 -
# Rule Belgium 1945 only - Sep 16  2:00s 0 -
# Rule Neth 1945 only - Sep 16 2:00s 0 -
#
# The rule line to be changed is:
#
# Rule C-Eur 1945 only - Sep 16  2:00 0 -
#
# It seems that Paris, Monaco, Rule France, Rule Belgium all agree on
# 2:00 standard time, e.g. 3:00 local time.  However there are no
# countries that use C-Eur rules in September 1945, so the only items
# affected are apparently these fictitious zones that translate acronyms
# CET and MET:
#
# Zone CET  1:00 C-Eur CE%sT
# Zone MET  1:00 C-Eur ME%sT
#
# It this is right then the corrected version would look like:
#
# Rule C-Eur 1945 only - Sep 16  2:00s 0 -
#
# A small step for mankind though 8-)
Rule	C-Eur	1945	only	-	Sep	16	 2:00s	0	-
Rule	C-Eur	1977	1980	-	Apr	Sun>=1	 2:00s	1:00	S
Rule	C-Eur	1977	only	-	Sep	lastSun	 2:00s	0	-
Rule	C-Eur	1978	only	-	Oct	 1	 2:00s	0	-
Rule	C-Eur	1979	1995	-	Sep	lastSun	 2:00s	0	-
Rule	C-Eur	1981	max	-	Mar	lastSun	 2:00s	1:00	S
Rule	C-Eur	1996	max	-	Oct	lastSun	 2:00s	0	-

# E-Eur differs from EU only in that E-Eur switches at midnight local time.
Rule	E-Eur	1977	1980	-	Apr	Sun>=1	 0:00	1:00	S
Rule	E-Eur	1977	only	-	Sep	lastSun	 0:00	0	-
Rule	E-Eur	1978	only	-	Oct	 1	 0:00	0	-
Rule	E-Eur	1979	1995	-	Sep	lastSun	 0:00	0	-
Rule	E-Eur	1981	max	-	Mar	lastSun	 0:00	1:00	S
Rule	E-Eur	1996	max	-	Oct	lastSun	 0:00	0	-


# Daylight saving time for Russia and the Soviet Union
#
# The 1917-1921 decree URLs are from Alexander Belopolsky (2016-08-23).

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Russia	1917	only	-	Jul	 1	23:00	1:00	MST  # Moscow Summer Time
#
# Decree No. 142 (1917-12-22) http://istmat.info/node/28137
Rule	Russia	1917	only	-	Dec	28	 0:00	0	MMT  # Moscow Mean Time
#
# Decree No. 497 (1918-05-30) http://istmat.info/node/30001
Rule	Russia	1918	only	-	May	31	22:00	2:00	MDST # Moscow Double Summer Time
Rule	Russia	1918	only	-	Sep	16	 1:00	1:00	MST
#
# Decree No. 258 (1919-05-29) http://istmat.info/node/37949
Rule	Russia	1919	only	-	May	31	23:00	2:00	MDST
#
Rule	Russia	1919	only	-	Jul	 1	 0:00u	1:00	MSD
Rule	Russia	1919	only	-	Aug	16	 0:00	0	MSK
#
# Decree No. 63 (1921-02-03) http://istmat.info/node/45840
Rule	Russia	1921	only	-	Feb	14	23:00	1:00	MSD
#
# Decree No. 121 (1921-03-07) http://istmat.info/node/45949
Rule	Russia	1921	only	-	Mar	20	23:00	2:00	+05
#
Rule	Russia	1921	only	-	Sep	 1	 0:00	1:00	MSD
Rule	Russia	1921	only	-	Oct	 1	 0:00	0	-
# Act No. 925 of the Council of Ministers of the USSR (1980-10-24):
Rule	Russia	1981	1984	-	Apr	 1	 0:00	1:00	S
Rule	Russia	1981	1983	-	Oct	 1	 0:00	0	-
# Act No. 967 of the Council of Ministers of the USSR (1984-09-13), repeated in
# Act No. 227 of the Council of Ministers of the USSR (1989-03-14):
Rule	Russia	1984	1995	-	Sep	lastSun	 2:00s	0	-
Rule	Russia	1985	2010	-	Mar	lastSun	 2:00s	1:00	S
#
Rule	Russia	1996	2010	-	Oct	lastSun	 2:00s	0	-
# As described below, Russia's 2014 change affects Zone data, not Rule data.

# From Stepan Golosunov (2016-03-07):
# Wikipedia and other sources refer to the Act of the Council of
# Ministers of the USSR from 1988-01-04 No. 5 and the Act of the
# Council of Ministers of the USSR from 1989-03-14 No. 227.
#
# I did not find full texts of these acts.  For the 1989 one we have
# title at https://base.garant.ru/70754136/ :
# "About change in calculation of time on the territories of
# Lithuanian SSR, Latvian SSR and Estonian SSR, Astrakhan,
# Kaliningrad, Kirov, Kuybyshev, Ulyanovsk and Uralsk oblasts".
# And http://astrozet.net/files/Zones/DOC/RU/1980-925.txt appears to
# contain quotes from both acts: Since last Sunday of March 1988 rules
# of the second time belt are installed in Volgograd and Saratov
# oblasts.  Since last Sunday of March 1989:
# a) Lithuanian SSR, Latvian SSR, Estonian SSR, Kaliningrad oblast:
# second time belt rules without extra hour (Moscow-1);
# b) Astrakhan, Kirov, Kuybyshev, Ulyanovsk oblasts: second time belt
# rules (Moscow time)
# c) Uralsk oblast: third time belt rules (Moscow+1).

# From Stepan Golosunov (2016-03-27):
# Unamended version of the act of the
# Government of the Russian Federation No. 23 from 08.01.1992
# http://pravo.gov.ru/proxy/ips/?docbody=&nd=102014034&rdk=0
# says that every year clocks were to be moved forward on last Sunday
# of March at 2 hours and moved backwards on last Sunday of September
# at 3 hours.  It was amended in 1996 to replace September with October.

# From Alexander Krivenyshev (2011-06-14):
# According to Kremlin press service, Russian President Dmitry Medvedev
# signed a federal law "On calculation of time" on June 9, 2011.
# According to the law Russia is abolishing daylight saving time.
#
# Medvedev signed a law "On the Calculation of Time" (in russian):
# http://bmockbe.ru/events/?ID=7583
#
# Medvedev signed a law on the calculation of the time (in russian):
# https://www.regnum.ru/news/polit/1413906.html

# From Arthur David Olson (2011-06-15):
# Take "abolishing daylight saving time" to mean that time is now considered
# to be standard.

# Previous editions of this database used abbreviations like MET DST
# for Central European Summer Time, but this didn't agree with common usage.

# From Markus Kuhn (1996-07-12):
# The official German names ... are
#
#	Mitteleuropäische Zeit (MEZ)         = UTC+01:00
#	Mitteleuropäische Sommerzeit (MESZ)  = UTC+02:00
#
# as defined in the German Time Act (Gesetz über die Zeitbestimmung (ZeitG),
# 1978-07-25, Bundesgesetzblatt, Jahrgang 1978, Teil I, S. 1110-1111)....
# I wrote ... to the German Federal Physical-Technical Institution
#
#	Physikalisch-Technische Bundesanstalt (PTB)
#	Laboratorium 4.41 "Zeiteinheit"
#	Postfach 3345
#	D-38023 Braunschweig
#	phone: +49 531 592-0
#
# ... I received today an answer letter from Dr. Peter Hetzel, head of the PTB
# department for time and frequency transmission.  He explained that the
# PTB translates MEZ and MESZ into English as
#
#	Central European Time (CET)         = UTC+01:00
#	Central European Summer Time (CEST) = UTC+02:00


# Albania
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Albania	1940	only	-	Jun	16	0:00	1:00	S
Rule	Albania	1942	only	-	Nov	 2	3:00	0	-
Rule	Albania	1943	only	-	Mar	29	2:00	1:00	S
Rule	Albania	1943	only	-	Apr	10	3:00	0	-
Rule	Albania	1974	only	-	May	 4	0:00	1:00	S
Rule	Albania	1974	only	-	Oct	 2	0:00	0	-
Rule	Albania	1975	only	-	May	 1	0:00	1:00	S
Rule	Albania	1975	only	-	Oct	 2	0:00	0	-
Rule	Albania	1976	only	-	May	 2	0:00	1:00	S
Rule	Albania	1976	only	-	Oct	 3	0:00	0	-
Rule	Albania	1977	only	-	May	 8	0:00	1:00	S
Rule	Albania	1977	only	-	Oct	 2	0:00	0	-
Rule	Albania	1978	only	-	May	 6	0:00	1:00	S
Rule	Albania	1978	only	-	Oct	 1	0:00	0	-
Rule	Albania	1979	only	-	May	 5	0:00	1:00	S
Rule	Albania	1979	only	-	Sep	30	0:00	0	-
Rule	Albania	1980	only	-	May	 3	0:00	1:00	S
Rule	Albania	1980	only	-	Oct	 4	0:00	0	-
Rule	Albania	1981	only	-	Apr	26	0:00	1:00	S
Rule	Albania	1981	only	-	Sep	27	0:00	0	-
Rule	Albania	1982	only	-	May	 2	0:00	1:00	S
Rule	Albania	1982	only	-	Oct	 3	0:00	0	-
Rule	Albania	1983	only	-	Apr	18	0:00	1:00	S
Rule	Albania	1983	only	-	Oct	 1	0:00	0	-
Rule	Albania	1984	only	-	Apr	 1	0:00	1:00	S
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Tirane	1:19:20 -	LMT	1914
			1:00	-	CET	1940 Jun 16
			1:00	Albania	CE%sT	1984 Jul
			1:00	EU	CE%sT

# Andorra
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Andorra	0:06:04 -	LMT	1901
			0:00	-	WET	1946 Sep 30
			1:00	-	CET	1985 Mar 31  2:00
			1:00	EU	CE%sT

# Austria

# Milne says Vienna time was 1:05:21.

# From Paul Eggert (2006-03-22): Shanks & Pottenger give 1918-06-16 and
# 1945-11-18, but the Austrian Federal Office of Metrology and
# Surveying (BEV) gives 1918-09-16 and for Vienna gives the "alleged"
# date of 1945-04-12 with no time.  For the 1980-04-06 transition
# Shanks & Pottenger give 02:00, the BEV 00:00.  Go with the BEV,
# and guess 02:00 for 1945-04-12.

# From Alois Treindl (2019-07-22):
# In 1946 the end of DST was on Monday, 7 October 1946, at 3:00 am.
# Shanks had this right.  Source: Die Weltpresse, 5. Oktober 1946, page 5.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Austria	1920	only	-	Apr	 5	2:00s	1:00	S
Rule	Austria	1920	only	-	Sep	13	2:00s	0	-
Rule	Austria	1946	only	-	Apr	14	2:00s	1:00	S
Rule	Austria	1946	only	-	Oct	 7	2:00s	0	-
Rule	Austria	1947	1948	-	Oct	Sun>=1	2:00s	0	-
Rule	Austria	1947	only	-	Apr	 6	2:00s	1:00	S
Rule	Austria	1948	only	-	Apr	18	2:00s	1:00	S
Rule	Austria	1980	only	-	Apr	 6	0:00	1:00	S
Rule	Austria	1980	only	-	Sep	28	0:00	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Vienna	1:05:21 -	LMT	1893 Apr
			1:00	C-Eur	CE%sT	1920
			1:00	Austria	CE%sT	1940 Apr  1  2:00s
			1:00	C-Eur	CE%sT	1945 Apr  2  2:00s
			1:00	1:00	CEST	1945 Apr 12  2:00s
			1:00	-	CET	1946
			1:00	Austria	CE%sT	1981
			1:00	EU	CE%sT

# Belarus
#
# From Stepan Golosunov (2016-07-02):
# http://www.lawbelarus.com/repub/sub30/texf9611.htm
# (Act of the Cabinet of Ministers of the Republic of Belarus from
# 1992-03-25 No. 157) ... says clocks were to be moved forward at 2:00
# on last Sunday of March and backward at 3:00 on last Sunday of September
# (the same as previous USSR and contemporary Russian regulations).
#
# From Yauhen Kharuzhy (2011-09-16):
# By latest Belarus government act Europe/Minsk timezone was changed to
# GMT+3 without DST (was GMT+2 with DST).
#
# Sources (Russian language):
# http://www.belta.by/ru/all_news/society/V-Belarusi-otmenjaetsja-perexod-na-sezonnoe-vremja_i_572952.html
# http://naviny.by/rubrics/society/2011/09/16/ic_articles_116_175144/
# https://news.tut.by/society/250578.html
#
# From Alexander Bokovoy (2014-10-09):
# Belarussian government decided against changing to winter time....
# http://eng.belta.by/all_news/society/Belarus-decides-against-adjusting-time-in-Russias-wake_i_76335.html
#
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Minsk	1:50:16 -	LMT	1880
			1:50	-	MMT	1924 May  2 # Minsk Mean Time
			2:00	-	EET	1930 Jun 21
			3:00	-	MSK	1941 Jun 28
			1:00	C-Eur	CE%sT	1944 Jul  3
			3:00	Russia	MSK/MSD	1990
			3:00	-	MSK	1991 Mar 31  2:00s
			2:00	Russia	EE%sT	2011 Mar 27  2:00s
			3:00	-	%z

# Belgium
# Luxembourg
# Netherlands
#
# From Michael Deckers (2019-08-25):
# The exposition in the web page
# https://www.bestor.be/wiki/index.php/Voyager_dans_le_temps._L%E2%80%99introduction_de_la_norme_de_Greenwich_en_Belgique
# gives several contemporary sources from which one can conclude that
# the switch in Europe/Brussels on 1892-05-01 was from 00:17:30 to 00:00:00.
#
# From Paul Eggert (2019-08-28):
# This quote helps explain the late-1914 situation:
#   In early November 1914, the Germans imposed the time zone used in central
#   Europe and forced the inhabitants to set their watches and public clocks
#   sixty minutes ahead.  Many were reluctant to accept "German time" and
#   continued to use "Belgian time" among themselves.  Reflecting the spirit of
#   resistance that arose in the population, a song made fun of this change....
# The song ended:
#   Putting your clock forward
#   Will but hasten the happy hour
#   When we kick out the Boches!
# See: Pluvinage G. Brussels on German time. Cahiers Bruxellois -
# Brusselse Cahiers. 2014;XLVI(1E):15-38.
# https://www.cairn.info/revue-cahiers-bruxellois-2014-1E-page-15.htm
#
# Entries from 1914 through 1917 are taken from "De tijd in België"
# <https://www.astro.oma.be/GENERAL/INFO/nli001a.html>.
# Entries from 1918 through 1991 are taken from:
#	Annuaire de L'Observatoire Royal de Belgique,
#	Avenue Circulaire, 3, B-1180 BRUXELLES, CLVIIe année, 1991
#	(Imprimerie HAYEZ, s.p.r.l., Rue Fin, 4, 1080 BRUXELLES, MCMXC),
#	pp 8-9.
# Thanks to Pascal Delmoitie for the 1918/1991 references.
# The 1918 rules are listed for completeness; they apply to unoccupied Belgium.
# Assume Brussels switched to WET in 1918 when the armistice took effect.
#
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Belgium	1918	only	-	Mar	 9	 0:00s	1:00	S
Rule	Belgium	1918	1919	-	Oct	Sat>=1	23:00s	0	-
Rule	Belgium	1919	only	-	Mar	 1	23:00s	1:00	S
Rule	Belgium	1920	only	-	Feb	14	23:00s	1:00	S
Rule	Belgium	1920	only	-	Oct	23	23:00s	0	-
Rule	Belgium	1921	only	-	Mar	14	23:00s	1:00	S
Rule	Belgium	1921	only	-	Oct	25	23:00s	0	-
Rule	Belgium	1922	only	-	Mar	25	23:00s	1:00	S
Rule	Belgium	1922	1927	-	Oct	Sat>=1	23:00s	0	-
Rule	Belgium	1923	only	-	Apr	21	23:00s	1:00	S
Rule	Belgium	1924	only	-	Mar	29	23:00s	1:00	S
Rule	Belgium	1925	only	-	Apr	 4	23:00s	1:00	S
# DISHO writes that a royal decree of 1926-02-22 specified the Sun following 3rd
# Sat in Apr (except if it's Easter, in which case it's one Sunday earlier),
# to Sun following 1st Sat in Oct, and that a royal decree of 1928-09-15
# changed the transition times to 02:00 GMT.
Rule	Belgium	1926	only	-	Apr	17	23:00s	1:00	S
Rule	Belgium	1927	only	-	Apr	 9	23:00s	1:00	S
Rule	Belgium	1928	only	-	Apr	14	23:00s	1:00	S
Rule	Belgium	1928	1938	-	Oct	Sun>=2	 2:00s	0	-
Rule	Belgium	1929	only	-	Apr	21	 2:00s	1:00	S
Rule	Belgium	1930	only	-	Apr	13	 2:00s	1:00	S
Rule	Belgium	1931	only	-	Apr	19	 2:00s	1:00	S
Rule	Belgium	1932	only	-	Apr	 3	 2:00s	1:00	S
Rule	Belgium	1933	only	-	Mar	26	 2:00s	1:00	S
Rule	Belgium	1934	only	-	Apr	 8	 2:00s	1:00	S
Rule	Belgium	1935	only	-	Mar	31	 2:00s	1:00	S
Rule	Belgium	1936	only	-	Apr	19	 2:00s	1:00	S
Rule	Belgium	1937	only	-	Apr	 4	 2:00s	1:00	S
Rule	Belgium	1938	only	-	Mar	27	 2:00s	1:00	S
Rule	Belgium	1939	only	-	Apr	16	 2:00s	1:00	S
Rule	Belgium	1939	only	-	Nov	19	 2:00s	0	-
Rule	Belgium	1940	only	-	Feb	25	 2:00s	1:00	S
Rule	Belgium	1944	only	-	Sep	17	 2:00s	0	-
Rule	Belgium	1945	only	-	Apr	 2	 2:00s	1:00	S
Rule	Belgium	1945	only	-	Sep	16	 2:00s	0	-
Rule	Belgium	1946	only	-	May	19	 2:00s	1:00	S
Rule	Belgium	1946	only	-	Oct	 7	 2:00s	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Brussels	0:17:30 -	LMT	1880
			0:17:30	-	BMT	1892 May  1 00:17:30
			0:00	-	WET	1914 Nov  8
			1:00	-	CET	1916 May  1  0:00
			1:00	C-Eur	CE%sT	1918 Nov 11 11:00u
			0:00	Belgium	WE%sT	1940 May 20  2:00s
			1:00	C-Eur	CE%sT	1944 Sep  3
			1:00	Belgium	CE%sT	1977
			1:00	EU	CE%sT

# Bulgaria
#
# From Plamen Simenov via Steffen Thorsen (1999-09-09):
# A document of Government of Bulgaria (No. 94/1997) says:
# EET -> EETDST is in 03:00 Local time in last Sunday of March ...
# EETDST -> EET is in 04:00 Local time in last Sunday of October
#
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Bulg	1979	only	-	Mar	31	23:00	1:00	S
Rule	Bulg	1979	only	-	Oct	 1	 1:00	0	-
Rule	Bulg	1980	1982	-	Apr	Sat>=1	23:00	1:00	S
Rule	Bulg	1980	only	-	Sep	29	 1:00	0	-
Rule	Bulg	1981	only	-	Sep	27	 2:00	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Sofia	1:33:16 -	LMT	1880
			1:56:56	-	IMT	1894 Nov 30 # Istanbul MT?
			2:00	-	EET	1942 Nov  2  3:00
			1:00	C-Eur	CE%sT	1945
			1:00	-	CET	1945 Apr  2  3:00
			2:00	-	EET	1979 Mar 31 23:00
			2:00	Bulg	EE%sT	1982 Sep 26  3:00
			2:00	C-Eur	EE%sT	1991
			2:00	E-Eur	EE%sT	1997
			2:00	EU	EE%sT

# Cyprus
# Please see the 'asia' file for Asia/Nicosia.

# Czech Republic (Czechia)
# Slovakia
#
# From Ivan Benovic (2024-01-30):
# https://www.slov-lex.sk/pravne-predpisy/SK/ZZ/1946/54/
# (This is an official link to the Czechoslovak Summer Time Act of
# March 8, 1946 that authorizes the Czechoslovak government to set the
# exact dates of change to summer time and back to Central European Time.
# The act also implicitly confirms Central European Time as the
# official time zone of Czechoslovakia and currently remains in force
# in both the Czech Republic and Slovakia.)
# https://www.psp.cz/eknih/1945pns/tisky/t0216_00.htm
# (This is a link to the original legislative proposal dating back to
# February 22, 1946. The accompanying memorandum to the proposal says
# that an advisory committee on European railroad transportation that
# met in Brussels in October 1945 decided that the change of time
# should be carried out in all participating countries in a strictly
# coordinated manner....)
#
# From Paul Eggert (2024-01-30):
# The source for Czech data is: Kdy začíná a končí letní čas.
# https://kalendar.beda.cz/kdy-zacina-a-konci-letni-cas
# Its main text disagrees with its quoted sources only in 1918,
# where the main text says spring and autumn transitions
# occurred at 02:00 and 03:00 respectively (as usual),
# whereas the 1918 source "Oznámení o zavedení letního času v roce 1918"
# says transitions were at 01:00 and 02:00 respectively.
# As the 1918 source appears to be a humorous piece, and it is
# unlikely that Prague would have disagreed with its neighbors by an hour,
# go with the main text for now.
#
# We know of no English-language name for historical Czech winter time;
# abbreviate it as "GMT", as it happened to be GMT.
#
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Czech	1945	only	-	Apr	Mon>=1	2:00s	1:00	S
Rule	Czech	1945	only	-	Oct	 1	2:00s	0	-
Rule	Czech	1946	only	-	May	 6	2:00s	1:00	S
Rule	Czech	1946	1949	-	Oct	Sun>=1	2:00s	0	-
Rule	Czech	1947	1948	-	Apr	Sun>=15	2:00s	1:00	S
Rule	Czech	1949	only	-	Apr	 9	2:00s	1:00	S
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Prague	0:57:44 -	LMT	1850
			0:57:44	-	PMT	1891 Oct    # Prague Mean Time
			1:00	C-Eur	CE%sT	1945 May  9
			1:00	Czech	CE%sT	1946 Dec  1  3:00
# Vanguard section, for zic and other parsers that support negative DST.
			1:00	-1:00	GMT	1947 Feb 23  2:00
# Rearguard section, for parsers lacking negative DST; see ziguard.awk.
#			0:00	-	GMT	1947 Feb 23  2:00
# End of rearguard section.
			1:00	Czech	CE%sT	1979
			1:00	EU	CE%sT

# Faroe Is
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone Atlantic/Faroe	-0:27:04 -	LMT	1908 Jan 11 # Tórshavn
			 0:00	-	WET	1981
			 0:00	EU	WE%sT

# Greenland
#
# From Paul Eggert (2026-01-22):
# During World War II, Greenland was effectively independent of Denmark and
# observed daylight saving time.  TIME, volume 37, page 23 (1941-04-21)
# <https://time.com/archive/6770243/war-peace-greenlands-icy-mountains/> says,
# "Penfield and West made their way to the U.S.'s most northerly consulate.
# They were astonished to find that Greenlanders, with almost 24 hours of
# sunlight a day during the summer, have daylight saving time."
# As the details are unknown they are omitted from the data for now.
#
# During World War II, Germany maintained secret manned weather stations in
# East Greenland and Franz Josef Land, but we don't know their time zones.
# Also, they're likely out of scope for the database
# as we lack resources to track every bit of military activity.
# My source for this is Wilhelm Dege's book mentioned under Svalbard.
#
# From Paul Eggert (2017-12-10):
# Greenland joined the European Communities as part of Denmark,
# obtained home rule on 1979-05-01, and left the European Communities
# on 1985-02-01.  It therefore should have been using EU
# rules at least through 1984.  Shanks & Pottenger say Scoresbysund and Godthåb
# used C-Eur rules after 1980, but IATA SSIM (1991/1996) says they use EU
# rules since at least 1991.  Assume EU rules since 1980.

# From Gwillim Law (2001-06-06), citing
# <http://www.statkart.no/efs/efshefter/2001/efs5-2001.pdf> (2001-03-15),
# and with translations corrected by Steffen Thorsen:
#
# Greenland has four local times, and the relation to UTC
# is according to the following time line:
#
# The military zone near Thule	UTC-4
# Standard Greenland time	UTC-3
# Scoresbysund			UTC-1
# Danmarkshavn			UTC
#
# In the military area near Thule and in Danmarkshavn DST will not be
# introduced.

# From Rives McDow (2001-11-01):
#
# I correspond regularly with the Dansk Polarcenter, and wrote them at
# the time to clarify the situation in Thule.  Unfortunately, I have
# not heard back from them regarding my recent letter.  [But I have
# info from earlier correspondence.]
#
# According to the center, a very small local time zone around Thule
# Air Base keeps the time according to UTC-4, implementing daylight
# savings using North America rules, changing the time at 02:00 local time....
#
# The east coast of Greenland north of the community of Scoresbysund
# uses UTC in the same way as in Iceland, year round, with no dst.
# There are just a few stations on this coast, including the
# Danmarkshavn ICAO weather station mentioned in your September 29th
# email.  The other stations are two sledge patrol stations in
# Mestersvig and Daneborg, the air force base at Station Nord, and the
# DPC research station at Zackenberg.
#
# Scoresbysund and two small villages nearby keep time UTC-1 and use
# the same daylight savings time period as in West Greenland (Godthåb).
#
# The rest of Greenland, including Godthåb (this area, although it
# includes central Greenland, is known as west Greenland), keeps time
# UTC-3, with daylight savings methods according to European rules.
#
# It is common procedure to use UTC 0 in the wilderness of East and
# North Greenland, because it is mainly Icelandic aircraft operators
# maintaining traffic in these areas.  However, the official status of
# this area is that it sticks with Godthåb time.  This area might be
# considered a dual time zone in some respects because of this.

# From Rives McDow (2001-11-19):
# I heard back from someone stationed at Thule; the time change took place
# there at 2:00 AM.

# From Paul Eggert (2006-03-22):
# From 1997 on the CIA map shows Danmarkshavn on GMT;
# the 1995 map as like Godthåb.
# For lack of better info, assume they were like Godthåb before 1996.
# startkart.no says Thule does not observe DST, but this is clearly an error,
# so go with Shanks & Pottenger for Thule transitions until this year.
# For 2007 on assume Thule will stay in sync with US DST rules.

# From J William Piggott (2016-02-20):
# "Greenland north of the community of Scoresbysund" is officially named
# "National Park" by Executive Order:
# http://naalakkersuisut.gl/~/media/Nanoq/Files/Attached%20Files/Engelske-tekster/Legislation/Executive%20Order%20National%20Park.rtf
# It is their only National Park.

# From Jonas Nyrup (2022-11-24):
# On last Saturday in October 2023 when DST ends America/Nuuk will switch
# from -03/-02 to -02/-01
# https://sermitsiaq.ag/forslagtidsforskel-danmark-mindskes-sommertid-beholdes
# ...
# https://sermitsiaq.ag/groenland-skifte-tidszone-trods-bekymringer
#
# From Jürgen Appel (2022-11-25):
# https://ina.gl/samlinger/oversigt-over-samlinger/samling/dagsordener/dagsorden.aspx?lang=da&day=24-11-2022
#
# From Thomas M. Steenholdt (2022-12-02):
# - The bill to move America/Nuuk from UTC-03 to UTC-02 passed.
# - The bill to stop observing DST did not (Greenland will stop observing DST
#   when EU does).
# Details on the implementation are here (section 6):
# https://ina.gl/dvd/EM%202022/pdf/media/2553529/pkt17_em2022_tidens_bestemmelse_bem_da.pdf
# This is how the change will be implemented:
# 1. The shift *to* DST in 2023 happens as normal.
# 2. The shift *from* DST in 2023 happens as normal, but coincides with the
#    shift to UTC-02 normaltime (people will not change their clocks here).
# 3. After this, DST is still observed, but as -02/-01 instead of -03/-02.
#
# From Múte Bourup Egede via Jógvan Svabo Samuelsen (2023-03-15):
# Greenland will not switch to Daylight Saving Time this year, 2023,
# because the standard time for Greenland will change from UTC -3 to UTC -2.
# However, Greenland will change to Daylight Saving Time again in 2024
# and onwards.

# From Jule Dabars (2023-10-29):
# https://www.dr.dk/nyheder/seneste/i-nat-skal-uret-stilles-en-time-tilbage-men-foerste-gang-sker-det-ikke-i-groenland
# with a link to that page:
# https://naalakkersuisut.gl/Nyheder/2023/10/2710_sommertid
# ... Ittoqqortoormiit joins the time of Nuuk at March 2024.
# What would mean that America/Scoresbysund would either be in -01 year round
# or in -02/-01 like America/Nuuk, but no longer in -01/+00.
#
# From Paul Eggert (2023-10-29):
# For now, assume it will be like America/Nuuk.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Thule	1991	1992	-	Mar	lastSun	2:00	1:00	D
Rule	Thule	1991	1992	-	Sep	lastSun	2:00	0	S
Rule	Thule	1993	2006	-	Apr	Sun>=1	2:00	1:00	D
Rule	Thule	1993	2006	-	Oct	lastSun	2:00	0	S
Rule	Thule	2007	max	-	Mar	Sun>=8	2:00	1:00	D
Rule	Thule	2007	max	-	Nov	Sun>=1	2:00	0	S
#
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone America/Danmarkshavn -1:14:40 -	LMT	1916 Jul 28
			-3:00	-	%z	1980 Apr  6  2:00
			-3:00	EU	%z	1996
			0:00	-	GMT
#
# Use the old name Scoresbysund, as the current name Ittoqqortoormiit
# exceeds tzdb's 14-letter limit and has no common English abbreviation.
Zone America/Scoresbysund -1:27:52 -	LMT	1916 Jul 28 # Ittoqqortoormiit
			-2:00	-	%z	1980 Apr  6  2:00
			-2:00	C-Eur	%z	1981 Mar 29
			-1:00	EU	%z	2024 Mar 31
			-2:00	EU	%z
Zone America/Nuuk	-3:26:56 -	LMT	1916 Jul 28 # Godthåb
			-3:00	-	%z	1980 Apr  6  2:00
			-3:00	EU	%z	2023 Mar 26  1:00u
			-2:00	-	%z	2023 Oct 29  1:00u
			-2:00	EU	%z
Zone America/Thule	-4:35:08 -	LMT	1916 Jul 28 # Pituffik
			-4:00	Thule	A%sT

# Estonia
#
# From Paul Eggert (2016-03-18):
# The 1989 transition is from USSR act No. 227 (1989-03-14).
#
# From Peter Ilieve (1994-10-15):
# A relative in Tallinn confirms the accuracy of the data for 1989 onwards
# [through 1994] and gives the legal authority for it,
# a regulation of the Government of Estonia, No. 111 of 1989....
#
# From Peter Ilieve (1996-10-28):
# [IATA SSIM (1992/1996) claims that the Baltic republics switch at 01:00s,
# but a relative confirms that Estonia still switches at 02:00s, writing:]
# "I do not [know] exactly but there are some little different
# (confusing) rules for International Air and Railway Transport Schedules
# conversion in Sunday connected with end of summer time in Estonia....
# A discussion is running about the summer time efficiency and effect on
# human physiology.  It seems that Estonia maybe will not change to
# summer time next spring."

# From Peter Ilieve (1998-11-04), heavily edited:
# The 1998-09-22 Estonian time law
# http://trip.rk.ee/cgi-bin/thw?${BASE}=akt&${OOHTML}=rtd&TA=1998&TO=1&AN=1390
# refers to the Eighth Directive and cites the association agreement between
# the EU and Estonia, ratified by the Estonian law (RT II 1995, 22-27, 120).
#
# I also asked [my relative] whether they use any standard abbreviation
# for their standard and summer times. He says no, they use "suveaeg"
# (summer time) and "talveaeg" (winter time).

# From The Baltic Times <https://www.baltictimes.com/> (1999-09-09)
# via Steffen Thorsen:
# This year will mark the last time Estonia shifts to summer time,
# a council of the ruling coalition announced Sept. 6....
# But what this could mean for Estonia's chances of joining the European
# Union are still unclear.  In 1994, the EU declared summer time compulsory
# for all member states until 2001.  Brussels has yet to decide what to do
# after that.

# From Mart Oruaas (2000-01-29):
# Regulation No. 301 (1999-10-12) obsoletes previous regulation
# No. 206 (1998-09-22) and thus sticks Estonia to +02:00 GMT for all
# the year round.  The regulation is effective 1999-11-01.

# From Toomas Soome (2002-02-21):
# The Estonian government has changed once again timezone politics.
# Now we are using again EU rules.
#
# From Urmet Jänes (2002-03-28):
# The legislative reference is Government decree No. 84 on 2002-02-21.

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Tallinn	1:39:00	-	LMT	1880
			1:39:00	-	TMT	1918 Feb    # Tallinn Mean Time
			1:00	C-Eur	CE%sT	1919 Jul
			1:39:00	-	TMT	1921 May
			2:00	-	EET	1940 Aug  6
			3:00	-	MSK	1941 Sep 15
			1:00	C-Eur	CE%sT	1944 Sep 22
			3:00	Russia	MSK/MSD	1989 Mar 26  2:00s
			2:00	1:00	EEST	1989 Sep 24  2:00s
			2:00	C-Eur	EE%sT	1998 Sep 22
			2:00	EU	EE%sT	1999 Oct 31  4:00
			2:00	-	EET	2002 Feb 21
			2:00	EU	EE%sT

# Finland

# From Hannu Strang (1994-09-25 06:03:37 UTC):
# Well, here in Helsinki we're just changing from summer time to regular one,
# and it's supposed to change at 4am...

# From Janne Snabb (2010-07-15):
#
# I noticed that the Finland data is not accurate for years 1981 and 1982.
# During these two first trial years the DST adjustment was made one hour
# earlier than in forthcoming years. Starting 1983 the adjustment was made
# according to the central European standards.
#
# This is documented in Heikki Oja: Aikakirja 2007, published by The Almanac
# Office of University of Helsinki, ISBN 952-10-3221-9, available online (in
# Finnish) at
# https://almanakka.helsinki.fi/aikakirja/Aikakirja2007kokonaan.pdf
#
# Page 105 (56 in PDF version) has a handy table of all past daylight savings
# transitions. It is easy enough to interpret without Finnish skills.
#
# This is also confirmed by Finnish Broadcasting Company's archive at:
# http://www.yle.fi/elavaarkisto/?s=s&g=1&ag=5&t=&a=3401
#
# The news clip from 1981 says that "the time between 2 and 3 o'clock does not
# exist tonight."

# From Konstantin Hyppönen (2014-06-13):
# [Heikki Oja's book Aikakirja 2013]
# https://almanakka.helsinki.fi/images/aikakirja/Aikakirja2013kokonaan.pdf
# pages 104-105, including a scan from a newspaper published on Apr 2 1942
# say that ... [o]n Apr 2 1942, 24 o'clock (which means Apr 3 1942,
# 00:00), clocks were moved one hour forward. The newspaper
# mentions "on the night from Thursday to Friday"....
# On Oct 4 1942, clocks were moved at 1:00 one hour backwards.
#
# From Paul Eggert (2014-06-14):
# Go with Oja over Shanks.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Finland	1942	only	-	Apr	2	24:00	1:00	S
Rule	Finland	1942	only	-	Oct	4	1:00	0	-
Rule	Finland	1981	1982	-	Mar	lastSun	2:00	1:00	S
Rule	Finland	1981	1982	-	Sep	lastSun	3:00	0	-

# Milne says Helsinki (Helsingfors) time was 1:39:49.2 (official document).

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
		#STDOFF	1:39:49.2
Zone	Europe/Helsinki	1:39:49 -	LMT	1878 May 31
			1:39:49	-	HMT	1921 May    # Helsinki Mean Time
			2:00	Finland	EE%sT	1983
			2:00	EU	EE%sT

# France
# Monaco

# From Robert H. van Gent (2025-07-21):
# The most recent issue of the Annuaire [par le Bureau des Longitudes]
# on Gallica (2021) ... lists information for France
# https://gallica.bnf.fr/ark:/12148/bpt6k9127672b/f52.item
# From Paul Eggert (2025-07-21):
# Go with the 2020 Annuaire (published 2021) except as noted below.

# From Ciro Discepolo (2000-12-20):
#
# Henri Le Corre, Régimes horaires pour le monde entier, Éditions
# Traditionnelles - Paris 2 books, 1993
#
# Gabriel, Traité de l'heure dans le monde, Guy Trédaniel,
# Paris, 1991
#
# Françoise Gauquelin, Problèmes de l'heure résolus en astrologie,
# Guy Trédaniel, Paris 1987

# From Michael Deckers (2020-06-11):
# the law of 1891 <https://gallica.bnf.fr/ark:/12148/bpt6k64415343.texteImage>
# was published on 1891-03-15, so it could only take force on 1891-03-16.

# From Michael Deckers (2020-06-10):
# Le Gaulois, 1911-03-11, page 1/6, online at
# https://www.retronews.fr/societe/echo-de-presse/2018/01/29/1911-change-lheure-de-paris
# ... [ Instantly, all pressure driven clock dials halted...  Nine minutes and
#       twenty-one seconds later the hands resumed their circular motion. ]
# There are also precise reports about how the change was prepared in train
# stations: all the publicly visible clocks stopped at midnight railway time
# (or were covered), only the chief of service had a watch, labeled
# "Heure ancienne", that he kept running until it reached 00:04:21, when
# he announced "Heure nouvelle".  See the "Le Petit Journal 1911-03-11".
# https://gallica.bnf.fr/ark:/12148/bpt6k6192911/f1.item.zoom
#
# From Michael Deckers (2020-06-12):
# That "all French clocks stopped" for 00:09:21 is a misreading of French
# newspapers; this sort of adjustment applies only to certain
# remote-controlled clocks ("pendules pneumatiques", of which there existed
# perhaps a dozen in Paris, and which simply could not be set back remotely),
# but not to all the clocks in all French towns and villages.  For instance,
# the following story in the "Courrier de Saône-et-Loire" 1911-03-11, page 2:
# only works if legal time was stepped back (was not monotone): ...
#   [One can observe that children who had been born at midnight less 5
#    minutes and who had died at midnight of the old time, would turn out to
#    be dead before being born, time having been set back and having
#    suppressed 9 minutes and 25 seconds of their existence, that is, more
#    than they could spend.]
#
# From Paul Eggert (2020-06-12):
# French time in railway stations was legally five minutes behind civil time,
# which explains why railway "old time" ran to 00:04:21 instead of to 00:09:21.
# The law's text (which Michael Deckers noted is at
# <https://gallica.bnf.fr/ark:/12148/bpt6k2022333z/f2>) says only that
# at 1911-03-11 00:00 legal time was that of Paris mean time delayed by
# nine minutes and twenty-one seconds, and does not say how the
# transition from Paris mean time was to occur.
#
# tzdb has no way to represent stopped clocks.  As the railway practice
# was to keep a watch running on "old time" to decide when to restart
# the other clocks, this could be modeled as a transition for "old time" at
# 00:09:21.  However, since the law was ambiguous and clocks outside railway
# stations were probably done haphazardly with the popular impression being
# that the transition was done at 00:00 "old time", simply leave the time
# blank; this causes zic to default to 00:00 "old time" which is good enough.
# Do something similar for the 1891-03-16 transition.  There are similar
# problems in Algiers, Monaco and Tunis.

#
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	France	1916	only	-	Jun	14	23:00s	1:00	S
Rule	France	1916	1919	-	Oct	Sun>=1	23:00s	0	-
Rule	France	1917	only	-	Mar	24	23:00s	1:00	S
Rule	France	1918	only	-	Mar	 9	23:00s	1:00	S
Rule	France	1919	only	-	Mar	 1	23:00s	1:00	S
Rule	France	1920	only	-	Feb	14	23:00s	1:00	S
Rule	France	1920	only	-	Oct	23	23:00s	0	-
Rule	France	1921	only	-	Mar	14	23:00s	1:00	S
Rule	France	1921	only	-	Oct	25	23:00s	0	-
Rule	France	1922	only	-	Mar	25	23:00s	1:00	S
# From Robert H. van Gent (2025-07-22):
# There is a curious history behind the erroneous date for the start of
# daylight saving in France in 1923 as listed in the current issues of
# the Annuaire du Bureau des Longitudes.  [See:]
# https://lists.iana.org/hyperkitty/list/tz@iana.org/message/MYQEJMSXO2AIEZ3UIXZKMTTAIPY7KNT2/
# From Brian Inglis (2025-07-23):
# Légifrance JORF No. 0073 du 15 mars 1922
# https://www.legifrance.gouv.fr/jorf/jo/id/JORFCONT000000008324
# Légifrance JORF No. 0139 du 25 mai 1923
# https://www.legifrance.gouv.fr/jorf/jo/id/JORFCONT000000008416
# From Paul Eggert (2025-07-23):
# The latter specifies March's last Saturday at 23:00 to October's first
# Saturday at 24:00, except that if neighboring allies agree the dates
# can be moved to April's third Saturday and September's third Saturday.
# Apparently spring 1923 was tricky.  DISHO writes that in 1930,
# because of Easter, the transitions were Apr 12 and Oct 5.
# Use the 2020 Annuaire dates, except for spring 1923 where
# Shanks & Pottenger's May 26 matches the dates given in the 1924 and
# 1961-2001 issues of the Annuaire.
Rule	France	1922	1938	-	Oct	Sat>=1	23:00s	0	-
Rule	France	1923	only	-	May	26	23:00s	1:00	S
Rule	France	1924	only	-	Mar	29	23:00s	1:00	S
Rule	France	1925	only	-	Apr	 4	23:00s	1:00	S
Rule	France	1926	only	-	Apr	17	23:00s	1:00	S
Rule	France	1927	only	-	Apr	 9	23:00s	1:00	S
Rule	France	1928	only	-	Apr	14	23:00s	1:00	S
Rule	France	1929	only	-	Apr	20	23:00s	1:00	S
Rule	France	1930	only	-	Apr	12	23:00s	1:00	S
Rule	France	1931	only	-	Apr	18	23:00s	1:00	S
Rule	France	1932	only	-	Apr	 2	23:00s	1:00	S
Rule	France	1933	only	-	Mar	25	23:00s	1:00	S
Rule	France	1934	only	-	Apr	 7	23:00s	1:00	S
Rule	France	1935	only	-	Mar	30	23:00s	1:00	S
Rule	France	1936	only	-	Apr	18	23:00s	1:00	S
Rule	France	1937	only	-	Apr	 3	23:00s	1:00	S
Rule	France	1938	only	-	Mar	26	23:00s	1:00	S
Rule	France	1939	only	-	Apr	15	23:00s	1:00	S
Rule	France	1939	only	-	Nov	18	23:00s	0	-
Rule	France	1940	only	-	Feb	25	 2:00	1:00	S
# The French rules for 1941-1944 were not used in Paris, but Shanks & Pottenger
# write that they were used in Monaco and in many French locations.
# Le Corre writes that the upper limit of the free zone was Arnéguy, Orthez,
# Mont-de-Marsan, Bazas, Langon, Lamothe-Montravel, Marœuil, La
# Rochefoucauld, Champagne-Mouton, La Roche-Posay, La Haye-Descartes,
# Loches, Montrichard, Vierzon, Bourges, Moulins, Digoin,
# Paray-le-Monial, Montceau-les-Mines, Chalon-sur-Saône, Arbois,
# Dole, Morez, St-Claude, and Collonges (Haute-Savoie).
Rule	France	1941	only	-	May	 5	 0:00	2:00	M # Midsummer
# Shanks & Pottenger say this transition occurred at Oct 6 1:00,
# but go with Denis Excoffier (1997-12-12),
# who quotes the Ephémérides astronomiques for 1998 from Bureau des Longitudes
# as saying 5/10/41 22hUT.
Rule	France	1941	only	-	Oct	 6	 0:00	1:00	S
Rule	France	1942	only	-	Mar	 9	 0:00	2:00	M
Rule	France	1942	only	-	Nov	 2	 3:00	1:00	S
Rule	France	1943	only	-	Mar	29	 2:00	2:00	M
Rule	France	1943	only	-	Oct	 4	 3:00	1:00	S
Rule	France	1944	only	-	Apr	 3	 2:00	2:00	M
Rule	France	1944	only	-	Oct	 8	 1:00	1:00	S
Rule	France	1945	only	-	Apr	 2	 2:00	2:00	M
Rule	France	1945	only	-	Sep	16	 3:00	0	-
# Shanks & Pottenger give Mar 28 2:00 and Sep 26 3:00;
# go with Excoffier's 28/3/76 0hUT and 25/9/76 23hUT.
Rule	France	1976	only	-	Mar	28	 1:00	1:00	S
Rule	France	1976	only	-	Sep	26	 1:00	0	-
# Howse writes that the time in France was officially based
# on PMT-0:09:21 until 1978-08-09, when the time base finally switched to UTC.
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Paris	0:09:21 -	LMT	1891 Mar 16
			0:09:21	-	PMT	1911 Mar 11 # Paris Mean Time
# Shanks & Pottenger give 1940 Jun 14 0:00; go with Excoffier and Le Corre.
			0:00	France	WE%sT	1940 Jun 14 23:00
# Le Corre says Paris stuck with occupied-France time after the liberation;
# go with Shanks & Pottenger.
			1:00	C-Eur	CE%sT	1944 Aug 25
			0:00	France	WE%sT	1945 Sep 16  3:00
			1:00	France	CE%sT	1977
			1:00	EU	CE%sT

# Denmark
# Germany
# Norway
# Sweden

# From Markus Kuhn (1998-09-29):
# The German time zone web site by the Physikalisch-Technische
# Bundesanstalt contains DST information back to 1916.
# [See tz-link.html for the URL.]

# From Jörg Schilling (2002-10-23):
# In 1945, Berlin was switched to Moscow Summer time (GMT+4) by
# https://www.dhm.de/lemo/html/biografien/BersarinNikolai/
# General [Nikolai] Bersarin.

# From Paul Eggert (2003-03-08):
# http://www.parlament-berlin.de/pds-fraktion.nsf/727459127c8b66ee8525662300459099/defc77cb784f180ac1256c2b0030274b/$FILE/bersarint.pdf
# says that Bersarin issued an order to use Moscow time on May 20.
# However, Moscow did not observe daylight saving in 1945, so
# this was equivalent to UT +03, not +04.

# Svalbard & Jan Mayen

# From Steffen Thorsen (2001-05-01):
# Although I could not find it explicitly, it seems that Jan Mayen and
# Svalbard have been using the same time as Norway at least since the
# time they were declared as parts of Norway.  Svalbard was declared
# as a part of Norway by law of 1925-07-17 no 11, section 4 and Jan
# Mayen by law of 1930-02-27 no 2, section 2. (From
# <http://www.lovdata.no/all/nl-19250717-011.html> and
# <http://www.lovdata.no/all/nl-19300227-002.html>).  The law/regulation
# for normal/standard time in Norway is from 1894-06-29 no 1 (came
# into operation on 1895-01-01) and Svalbard/Jan Mayen seem to be a
# part of this law since 1925/1930. (From
# <http://www.lovdata.no/all/nl-18940629-001.html>) I have not been
# able to find if Jan Mayen used a different time zone (e.g. -0100)
# before 1930. Jan Mayen has only been "inhabited" since 1921 by
# Norwegian meteorologists and maybe used the same time as Norway ever
# since 1921.  Svalbard (Arctic/Longyearbyen) has been inhabited since
# before 1895, and therefore probably changed the local time somewhere
# between 1895 and 1925 (inclusive).

# From Paul Eggert (2013-09-04):
#
# Actually, Jan Mayen was never occupied by Germany during World War II,
# so it must have diverged from Oslo time during the war, as Oslo was
# keeping Berlin time.
#
# <https://www.jan-mayen.no/history.htm> says that the meteorologists
# burned down their station in 1940 and left the island, but returned in
# 1941 with a small Norwegian garrison and continued operations despite
# frequent air attacks from Germans.  In 1943 the Americans established a
# radiolocating station on the island, called "Atlantic City".  Possibly
# the UT offset changed during the war, but I think it unlikely that
# Jan Mayen used German daylight-saving rules.
#
# Svalbard is more complicated, as it was raided in August 1941 by an
# Allied party that evacuated the civilian population to England (says
# <http://www.bartleby.com/65/sv/Svalbard.html>).  The Svalbard FAQ
# <http://www.svalbard.com/SvalbardFAQ.html> says that the Germans were
# expelled on 1942-05-14.  However, small parties of Germans did return,
# and according to Wilhelm Dege's book "War North of 80" (1954)
# http://www.ucalgary.ca/UofC/departments/UP/1-55238/1-55238-110-2.html
# the German armed forces at the Svalbard weather station code-named
# Haudegen did not surrender to the Allies until September 1945.
#
# All these events predate our cutoff date of 1970, so use Europe/Berlin
# for these regions.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Germany	1946	only	-	Apr	14	2:00s	1:00	S
Rule	Germany	1946	only	-	Oct	 7	2:00s	0	-
Rule	Germany	1947	1949	-	Oct	Sun>=1	2:00s	0	-
# https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-441/realisation-of-legal-time-in-germany/dst-and-midsummer-dst-in-germany-until-1979.html
# says the following transition occurred at 3:00 MEZ, not the 2:00 MEZ
# given in Shanks & Pottenger. Go with the PTB.
Rule	Germany	1947	only	-	Apr	 6	3:00s	1:00	S
Rule	Germany	1947	only	-	May	11	2:00s	2:00	M
Rule	Germany	1947	only	-	Jun	29	3:00	1:00	S
Rule	Germany	1948	only	-	Apr	18	2:00s	1:00	S
Rule	Germany	1949	only	-	Apr	10	2:00s	1:00	S

Rule SovietZone	1945	only	-	May	24	2:00	2:00	M # Midsummer
Rule SovietZone	1945	only	-	Sep	24	3:00	1:00	S
Rule SovietZone	1945	only	-	Nov	18	2:00s	0	-

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Berlin	0:53:28 -	LMT	1893 Apr
			1:00	C-Eur	CE%sT	1945 May 24  2:00
			1:00 SovietZone	CE%sT	1946
			1:00	Germany	CE%sT	1980
			1:00	EU	CE%sT

# Georgia
# Please see the "asia" file for Asia/Tbilisi.
# Herodotus (Histories, IV.45) says Georgia north of the Phasis (now Rioni)
# is in Europe.  Our reference location Tbilisi is in the Asian part.

# Gibraltar
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone Europe/Gibraltar	-0:21:24 -	LMT	1880 Aug  2
			0:00	GB-Eire	%s	1957 Apr 14  2:00
			1:00	-	CET	1982
			1:00	EU	CE%sT

# Greece
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
# Whitman gives 1932 Jul 5 - Nov 1; go with Shanks & Pottenger.
Rule	Greece	1932	only	-	Jul	 7	0:00	1:00	S
Rule	Greece	1932	only	-	Sep	 1	0:00	0	-
# Whitman gives 1941 Apr 25 - ?; go with Shanks & Pottenger.
Rule	Greece	1941	only	-	Apr	 7	0:00	1:00	S
# Whitman gives 1942 Feb 2 - ?; go with Shanks & Pottenger.
Rule	Greece	1942	only	-	Nov	 2	3:00	0	-
Rule	Greece	1943	only	-	Mar	30	0:00	1:00	S
Rule	Greece	1943	only	-	Oct	 4	0:00	0	-
# Whitman gives 1944 Oct 3 - Oct 31; go with Shanks & Pottenger.
Rule	Greece	1952	only	-	Jul	 1	0:00	1:00	S
Rule	Greece	1952	only	-	Nov	 2	0:00	0	-
Rule	Greece	1975	only	-	Apr	12	0:00s	1:00	S
Rule	Greece	1975	only	-	Nov	26	0:00s	0	-
Rule	Greece	1976	only	-	Apr	11	2:00s	1:00	S
Rule	Greece	1976	only	-	Oct	10	2:00s	0	-
Rule	Greece	1977	1978	-	Apr	Sun>=1	2:00s	1:00	S
Rule	Greece	1977	only	-	Sep	26	2:00s	0	-
Rule	Greece	1978	only	-	Sep	24	4:00	0	-
Rule	Greece	1979	only	-	Apr	 1	9:00	1:00	S
Rule	Greece	1979	only	-	Sep	29	2:00	0	-
Rule	Greece	1980	only	-	Apr	 1	0:00	1:00	S
Rule	Greece	1980	only	-	Sep	28	0:00	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Athens	1:34:52 -	LMT	1895 Sep 14
			1:34:52	-	AMT	1916 Jul 28  0:01 # Athens MT
			2:00	Greece	EE%sT	1941 Apr 30
			1:00	Greece	CE%sT	1944 Apr  4
			2:00	Greece	EE%sT	1981
			# Shanks & Pottenger say it switched to C-Eur in 1981;
			# go with EU rules instead, since Greece joined Jan 1.
			2:00	EU	EE%sT

# Hungary

# From Michael Deckers (2020-06-09):
# an Austrian encyclopedia of railroads of 1913, online at
# http://www.zeno.org/Roell-1912/A/Eisenbahnzeit
# says that the switch [to CET] happened on 1890-11-01.

# From Géza Nyáry (2020-06-07):
# Data for 1918-1983 are based on the archive database of Library Hungaricana.
# The dates are collected from original, scanned governmental orders,
# bulletins, instructions and public press.
# [See URLs below.]

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
# https://library.hungaricana.hu/hu/view/OGYK_RT_1918/?pg=238
# https://library.hungaricana.hu/hu/view/OGYK_RT_1919/?pg=808
# https://library.hungaricana.hu/hu/view/OGYK_RT_1920/?pg=201
Rule	Hungary	1918	1919	-	Apr	15	 2:00	1:00	S
Rule	Hungary	1918	1920	-	Sep	Mon>=15	 3:00	0	-
Rule	Hungary	1920	only	-	Apr	 5	 2:00	1:00	S
# https://library.hungaricana.hu/hu/view/OGYK_RT_1945/?pg=882
Rule	Hungary	1945	only	-	May	 1	23:00	1:00	S
Rule	Hungary	1945	only	-	Nov	 1	 1:00	0	-
# https://library.hungaricana.hu/hu/view/Delmagyarorszag_1946_03/?pg=49
Rule	Hungary	1946	only	-	Mar	31	 2:00s	1:00	S
# https://library.hungaricana.hu/hu/view/Delmagyarorszag_1946_09/?pg=54
Rule	Hungary	1946	only	-	Oct	 7	 2:00	0	-
# https://library.hungaricana.hu/hu/view/KulfBelfHirek_1947_04_1__001-123/?pg=90
# https://library.hungaricana.hu/hu/view/DunantuliNaplo_1947_09/?pg=128
# https://library.hungaricana.hu/hu/view/KulfBelfHirek_1948_03_3__001-123/?pg=304
# https://library.hungaricana.hu/hu/view/Zala_1948_09/?pg=64
# https://library.hungaricana.hu/hu/view/SatoraljaujhelyiLeveltar_ZempleniNepujsag_1948/?pg=53
# https://library.hungaricana.hu/hu/view/SatoraljaujhelyiLeveltar_ZempleniNepujsag_1948/?pg=160
# https://library.hungaricana.hu/hu/view/UjSzo_1949_01-04/?pg=102
# https://library.hungaricana.hu/hu/view/KeletMagyarorszag_1949_03/?pg=96
# https://library.hungaricana.hu/hu/view/Delmagyarorszag_1949_09/?pg=94
Rule	Hungary	1947	1949	-	Apr	Sun>=4	 2:00s	1:00	S
Rule	Hungary	1947	1949	-	Oct	Sun>=1	 2:00s	0	-
# https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1954/?pg=513
Rule	Hungary	1954	only	-	May	23	 0:00	1:00	S
Rule	Hungary	1954	only	-	Oct	 3	 0:00	0	-
# https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1955/?pg=398
Rule	Hungary	1955	only	-	May	22	 2:00	1:00	S
Rule	Hungary	1955	only	-	Oct	 2	 3:00	0	-
# https://library.hungaricana.hu/hu/view/HevesMegyeiNepujsag_1956_06/?pg=0
# https://library.hungaricana.hu/hu/view/EszakMagyarorszag_1956_06/?pg=6
# https://library.hungaricana.hu/hu/view/SzolnokMegyeiNeplap_1957_04/?pg=120
# https://library.hungaricana.hu/hu/view/PestMegyeiHirlap_1957_09/?pg=143
Rule	Hungary	1956	1957	-	Jun	Sun>=1	 2:00	1:00	S
Rule	Hungary	1956	1957	-	Sep	lastSun	 3:00	0	-
# https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1980/?pg=189
Rule	Hungary	1980	only	-	Apr	 6	 0:00	1:00	S
Rule	Hungary	1980	only	-	Sep	28	 1:00	0	-
# https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1980/?pg=1227
# https://library.hungaricana.hu/hu/view/Delmagyarorszag_1981_01/?pg=79
# https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1982/?pg=115
# https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1983/?pg=85
Rule	Hungary	1981	1983	-	Mar	lastSun	 0:00	1:00	S
Rule	Hungary	1981	1983	-	Sep	lastSun	 1:00	0	-
#
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Budapest	1:16:20 -	LMT	1890 Nov  1
			1:00	C-Eur	CE%sT	1918
# https://library.hungaricana.hu/hu/view/OGYK_RT_1941/?pg=1204
# https://library.hungaricana.hu/hu/view/OGYK_RT_1942/?pg=3955
			1:00	Hungary	CE%sT	1941 Apr  7 23:00
			1:00	C-Eur	CE%sT	1945
			1:00	Hungary	CE%sT	1984
			1:00	EU	CE%sT

# Italy
# San Marino
# Vatican City
#
# From Paul Eggert (2001-03-06):
# Sicily and Sardinia each had their own time zones from 1866 to 1893,
# called Palermo Time (+00:53:28) and Cagliari Time (+00:36:32).
# During World War II, German-controlled Italy used German time.
# But these events all occurred before the 1970 cutoff,
# so record only the time in Rome.
#
# From Stephen Trainor (2019-05-06):
# http://www.ac-ilsestante.it/MERIDIANE/ora_legale/ORA_LEGALE_ESTIVA_IN_ITALIA.htm
# ... the [1866] law went into effect on 12 December 1866, rather than
# the date of the decree (22 Sep 1866)
# https://web.archive.org/web/20070824155341/http://www.iav.it/planetario/didastro/didastro/english.htm
# ... "In Italy in 1866 there were 6 railway times (Torino, Verona, Firenze,
# Roma, Napoli, Palermo). On that year it was decided to unify them, adopting
# the average time of Rome (even if this city was not yet part of the
# kingdom).  On the 12th December 1866, on the starting of the winter time
# table, it took effect in the railways, the post office and the telegraph,
# not only for the internal service but also for the public....  Milano set
# the public watches on the Rome time on the same day (12th December 1866),
# Torino and Bologna on the 1st January 1867, Venezia the 1st May 1880 and the
# last city was Cagliari in 1886."
#
# From Luigi Rosa (2019-05-07):
# this is the scan of the decree:
# http://www.radiomarconi.com/marconi/filopanti/1866c.jpg
#
# From Michael Deckers (2016-10-24):
# http://www.ac-ilsestante.it/MERIDIANE/ora_legale quotes a law of 1893-08-10
# ... [translated as] "The preceding dispositions will enter into
# force at the instant at which, according to the time specified in
# the 1st article, the 1st of November 1893 will begin...."
#
# From Pierpaolo Bernardi (2016-10-20):
# The authoritative source for time in Italy is the national metrological
# institute, which has a summary page of historical DST data at
# http://www.inrim.it/res/tf/ora_legale_i.shtml
# [now at http://oldsite.inrim.it/res/tf/ora_legale_i.shtml as of 2017]
# (2016-10-24):
# http://www.renzobaldini.it/le-ore-legali-in-italia/
# has still different data for 1944.  It divides Italy in two, as
# there were effectively two governments at the time, north of Gothic
# Line German controlled territory, official government RSI, and south
# of the Gothic Line, controlled by allied armies.
#
# From Brian Inglis (2016-10-23):
# Viceregal LEGISLATIVE DECREE. 14 September 1944, no. 219.
# Restoration of Standard Time. (044U0219) (OJ 62 of 30.9.1944) ...
# Given the R. law decreed on 1944-03-29, no. 92, by which standard time is
# advanced to sixty minutes later starting at hour two on 1944-04-02; ...
# Starting at hour three on the date 1944-09-17 standard time will be resumed.
#
# From Alois Treindl (2019-07-02):
# I spent 6 Euros to buy two archive copies of Il Messaggero, a Roman paper,
# for 1 and 2 April 1944.  The edition of 2 April has this note: "Tonight at 2
# am, put forward the clock by one hour.  Remember that in the night between
# today and Monday the 'ora legale' will come in force again."  That makes it
# clear that in Rome the change was on Monday, 3 April 1944 at 2 am.
#
# From Paul Eggert (2021-10-05):
# Go with INRiM for DST rules, except as corrected by Inglis for 1944
# for the Kingdom of Italy.  This is consistent with Renzo Baldini.
# Model Rome's occupation by using C-Eur rules from 1943-09-10
# to 1944-06-04; although Rome was an open city during this period, it
# was effectively controlled by Germany.  Using C-Eur is consistent
# with Treindl's comment about Rome in April 1944, as the "Rule Italy"
# lines during German occupation do not affect Europe/Rome
# (though they do affect Europe/Malta).
#
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Italy	1916	only	-	Jun	 3	24:00	1:00	S
Rule	Italy	1916	1917	-	Sep	30	24:00	0	-
Rule	Italy	1917	only	-	Mar	31	24:00	1:00	S
Rule	Italy	1918	only	-	Mar	 9	24:00	1:00	S
Rule	Italy	1918	only	-	Oct	 6	24:00	0	-
Rule	Italy	1919	only	-	Mar	 1	24:00	1:00	S
Rule	Italy	1919	only	-	Oct	 4	24:00	0	-
Rule	Italy	1920	only	-	Mar	20	24:00	1:00	S
Rule	Italy	1920	only	-	Sep	18	24:00	0	-
Rule	Italy	1940	only	-	Jun	14	24:00	1:00	S
Rule	Italy	1942	only	-	Nov	 2	 2:00s	0	-
Rule	Italy	1943	only	-	Mar	29	 2:00s	1:00	S
Rule	Italy	1943	only	-	Oct	 4	 2:00s	0	-
Rule	Italy	1944	only	-	Apr	 2	 2:00s	1:00	S
Rule	Italy	1944	only	-	Sep	17	 2:00s	0	-
Rule	Italy	1945	only	-	Apr	 2	 2:00	1:00	S
Rule	Italy	1945	only	-	Sep	15	 1:00	0	-
Rule	Italy	1946	only	-	Mar	17	 2:00s	1:00	S
Rule	Italy	1946	only	-	Oct	 6	 2:00s	0	-
Rule	Italy	1947	only	-	Mar	16	 0:00s	1:00	S
Rule	Italy	1947	only	-	Oct	 5	 0:00s	0	-
Rule	Italy	1948	only	-	Feb	29	 2:00s	1:00	S
Rule	Italy	1948	only	-	Oct	 3	 2:00s	0	-
Rule	Italy	1966	1968	-	May	Sun>=22	 0:00s	1:00	S
Rule	Italy	1966	only	-	Sep	24	24:00	0	-
Rule	Italy	1967	1969	-	Sep	Sun>=22	 0:00s	0	-
Rule	Italy	1969	only	-	Jun	 1	 0:00s	1:00	S
Rule	Italy	1970	only	-	May	31	 0:00s	1:00	S
Rule	Italy	1970	only	-	Sep	lastSun	 0:00s	0	-
Rule	Italy	1971	1972	-	May	Sun>=22	 0:00s	1:00	S
Rule	Italy	1971	only	-	Sep	lastSun	 0:00s	0	-
Rule	Italy	1972	only	-	Oct	 1	 0:00s	0	-
Rule	Italy	1973	only	-	Jun	 3	 0:00s	1:00	S
Rule	Italy	1973	1974	-	Sep	lastSun	 0:00s	0	-
Rule	Italy	1974	only	-	May	26	 0:00s	1:00	S
Rule	Italy	1975	only	-	Jun	 1	 0:00s	1:00	S
Rule	Italy	1975	1977	-	Sep	lastSun	 0:00s	0	-
Rule	Italy	1976	only	-	May	30	 0:00s	1:00	S
Rule	Italy	1977	1979	-	May	Sun>=22	 0:00s	1:00	S
Rule	Italy	1978	only	-	Oct	 1	 0:00s	0	-
Rule	Italy	1979	only	-	Sep	30	 0:00s	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Rome	0:49:56 -	LMT	1866 Dec 12
			0:49:56	-	RMT	1893 Oct 31 23:00u # Rome Mean
			1:00	Italy	CE%sT	1943 Sep 10
			1:00	C-Eur	CE%sT	1944 Jun  4
			1:00	Italy	CE%sT	1980
			1:00	EU	CE%sT

# Latvia

# From Liene Kanepe (1998-09-17):

# I asked about this matter Scientific Secretary of the Institute of Astronomy
# of The University of Latvia Dr. paed Mr. Ilgonis Vilks. I also searched the
# correct data in juridical acts and I found some juridical documents about
# changes in the counting of time in Latvia from 1981....
#
# Act No. 35 of the Council of Ministers of Latvian SSR of 1981-01-22 ...
# according to the Act No. 925 of the Council of Ministers of USSR of 1980-10-24
# ...: all year round the time of 2nd time zone + 1 hour, in addition turning
# the hands of the clock 1 hour forward on 1 April at 00:00 (GMT 31 March 21:00)
# and 1 hour backward on the 1 October at 00:00 (GMT 30 September 20:00).
#
# Act No. 592 of the Council of Ministers of Latvian SSR of 1984-09-24 ...
# according to the Act No. 967 of the Council of Ministers of USSR of 1984-09-13
# ...: all year round the time of 2nd time zone + 1 hour, in addition turning
# the hands of the clock 1 hour forward on the last Sunday of March at 02:00
# (GMT 23:00 on the previous day) and 1 hour backward on the last Sunday of
# September at 03:00 (GMT 23:00 on the previous day).
#
# Act No. 81 of the Council of Ministers of Latvian SSR of 1989-03-22 ...
# according to the Act No. 227 of the Council of Ministers of USSR of 1989-03-14
# ...: since the last Sunday of March 1989 in Lithuanian SSR, Latvian SSR,
# Estonian SSR and Kaliningrad region of Russian Federation all year round the
# time of 2nd time zone (Moscow time minus one hour). On the territory of Latvia
# transition to summer time is performed on the last Sunday of March at 02:00
# (GMT 00:00), turning the hands of the clock 1 hour forward.  The end of
# daylight saving time is performed on the last Sunday of September at 03:00
# (GMT 00:00), turning the hands of the clock 1 hour backward. Exception is
# 1989-03-26, when we must not turn the hands of the clock....
#
# The Regulations of the Cabinet of Ministers of the Republic of Latvia of
# 1997-01-21 on transition to Summer time ... established the same order of
# daylight savings time settings as in the States of the European Union.

# From Andrei Ivanov (2000-03-06):
# This year Latvia will not switch to Daylight Savings Time (as specified in
# The Regulations of the Cabinet of Ministers of the Rep. of Latvia of
# 29-Feb-2000 (No. 79) <http://www.lv-laiks.lv/wwwraksti/2000/071072/vd4.htm>,
# in Latvian for subscribers only).

# From RFE/RL Newsline
# http://www.rferl.org/newsline/2001/01/3-CEE/cee-030101.html
# (2001-01-03), noted after a heads-up by Rives McDow:
# The Latvian government on 2 January decided that the country will
# institute daylight-saving time this spring, LETA reported.
# Last February the three Baltic states decided not to turn back their
# clocks one hour in the spring....
# Minister of Economy Aigars Kalvītis noted that Latvia had too few
# daylight hours and thus decided to comply with a draft European
# Commission directive that provides for instituting daylight-saving
# time in EU countries between 2002 and 2006. The Latvian government
# urged Lithuania and Estonia to adopt a similar time policy, but it
# appears that they will not do so....

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Latvia	1989	1996	-	Mar	lastSun	 2:00s	1:00	S
Rule	Latvia	1989	1996	-	Sep	lastSun	 2:00s	0	-

# Milne 1899 says Riga was 1:36:28 (Polytechnique House time).
# Byalokoz 1919 says Latvia was 1:36:34.
# Go with Byalokoz.

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Riga	1:36:34	-	LMT	1880
			1:36:34	-	RMT	1918 Apr 15  2:00 # Riga MT
			1:36:34	1:00	LST	1918 Sep 16  3:00 # Latvian ST
			1:36:34	-	RMT	1919 Apr  1  2:00
			1:36:34	1:00	LST	1919 May 22  3:00
			1:36:34	-	RMT	1926 May 11
			2:00	-	EET	1940 Aug  5
			3:00	-	MSK	1941 Jul
			1:00	C-Eur	CE%sT	1944 Oct 13
			3:00	Russia	MSK/MSD	1989 Mar lastSun  2:00s
			2:00	1:00	EEST	1989 Sep lastSun  2:00s
			2:00	Latvia	EE%sT	1997 Jan 21
			2:00	EU	EE%sT	2000 Feb 29
			2:00	-	EET	2001 Jan  2
			2:00	EU	EE%sT

# Lithuania

# From Paul Eggert (2016-03-18):
# The 1989 transition is from USSR act No. 227 (1989-03-14).

# From Paul Eggert (1996-11-22):
# IATA SSIM (1992/1996) says Lithuania uses W-Eur rules, but since it is
# known to be wrong about Estonia and Latvia, assume it's wrong here too.

# From Marius Gedminas (1998-08-07):
# I would like to inform that in this year Lithuanian time zone
# (Europe/Vilnius) was changed.

# From ELTA No. 972 (2582) (1999-09-29) <http://www.elta.lt/>,
# via Steffen Thorsen:
# Lithuania has shifted back to the second time zone (GMT plus two hours)
# to be valid here starting from October 31,
# as decided by the national government on Wednesday....
# The Lithuanian government also announced plans to consider a
# motion to give up shifting to summer time in spring, as it was
# already done by Estonia.

# From the Fact File, Lithuanian State Department of Tourism
# <http://www.tourism.lt/informa/ff.htm> (2000-03-27):
# Local time is GMT+2 hours ..., no daylight saving.

# From a user via Klaus Marten (2003-02-07):
# As a candidate for membership of the European Union, Lithuania will
# observe Summer Time in 2003, changing its clocks at the times laid
# down in EU Directive 2000/84 of 19.I.01 (i.e. at the same times as its
# neighbour Latvia). The text of the Lithuanian government Order of
# 7.XI.02 to this effect can be found at
# http://www.lrvk.lt/nut/11/n1749.htm


# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Vilnius	1:41:16	-	LMT	1880
			1:24:00	-	WMT	1917        # Warsaw Mean Time
			1:35:36	-	KMT	1919 Oct 10 # Kaunas Mean Time
			1:00	-	CET	1920 Jul 12
			2:00	-	EET	1920 Oct  9
			1:00	-	CET	1940 Aug  3
			3:00	-	MSK	1941 Jun 24
			1:00	C-Eur	CE%sT	1944 Aug
			3:00	Russia	MSK/MSD	1989 Mar 26  2:00s
			2:00	Russia	EE%sT	1991 Sep 29  2:00s
			2:00	C-Eur	EE%sT	1998
			2:00	-	EET	1998 Mar 29  1:00u
			1:00	EU	CE%sT	1999 Oct 31  1:00u
			2:00	-	EET	2003 Jan  1
			2:00	EU	EE%sT

# Malta
#
# From Paul Eggert (2016-10-21):
# Assume 1900-1972 was like Rome, overriding Shanks.
#
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Malta	1973	only	-	Mar	31	0:00s	1:00	S
Rule	Malta	1973	only	-	Sep	29	0:00s	0	-
Rule	Malta	1974	only	-	Apr	21	0:00s	1:00	S
Rule	Malta	1974	only	-	Sep	16	0:00s	0	-
Rule	Malta	1975	1979	-	Apr	Sun>=15	2:00	1:00	S
Rule	Malta	1975	1980	-	Sep	Sun>=15	2:00	0	-
Rule	Malta	1980	only	-	Mar	31	2:00	1:00	S
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Malta	0:58:04 -	LMT	1893 Nov  2 # Valletta
			1:00	Italy	CE%sT	1973 Mar 31
			1:00	Malta	CE%sT	1981
			1:00	EU	CE%sT

# Moldova

# From Stepan Golosunov (2016-03-07):
# the act of the government of the Republic of Moldova Nr. 132 from 1990-05-04
# ... says that since 1990-05-06 on the territory of the Moldavian SSR
# time would be calculated as the standard time of the second time belt
# plus one hour of the "summer" time. To implement that clocks would be
# adjusted one hour backwards at 1990-05-06 2:00. After that "summer"
# time would be cancelled last Sunday of September at 3:00 and
# reintroduced last Sunday of March at 2:00.

# From Paul Eggert (2006-03-22):
# A previous version of this database followed Shanks & Pottenger, who write
# that Tiraspol switched to Moscow time on 1992-01-19 at 02:00.
# However, this is most likely an error, as Moldova declared independence
# on 1991-08-27 (the 1992-01-19 date is that of a Russian decree).
# In early 1992 there was large-scale interethnic violence in the area
# and it's possible that some Russophones continued to observe Moscow time.
# But [two people] separately reported via
# Jesper Nørgaard that as of 2001-01-24 Tiraspol was like Chisinau.
# The Tiraspol entry has therefore been removed for now.
#
# From Alexander Krivenyshev (2011-10-17):
# Pridnestrovian Moldavian Republic (PMR, also known as
# "Pridnestrovie") has abolished seasonal clock change (no transition
# to the Winter Time).
#
# News (in Russian):
# http://www.kyivpost.ua/russia/news/pridnestrove-otkazalos-ot-perehoda-na-zimnee-vremya-30954.html
# http://www.allmoldova.com/moldova-news/1249064116.html
#
# The substance of this change (reinstatement of the Tiraspol entry)
# is from a patch from Petr Machata (2011-10-17)
#
# From Tim Parenti (2011-10-19)
# In addition, being situated at +4651+2938 would give Tiraspol
# a pre-1880 LMT offset of 1:58:32.
#
# (which agrees with the earlier entry that had been removed)
#
# From Alexander Krivenyshev (2011-10-26)
# NO need to divide Moldova into two timezones at this point.
# As of today, Transnistria (Pridnestrovie)- Tiraspol reversed its own
# decision to abolish DST this winter.
# Following Moldova and neighboring Ukraine- Transnistria (Pridnestrovie)-
# Tiraspol will go back to winter time on October 30, 2011.
# News from Moldova (in russian):
# https://ru.publika.md/link_317061.html

# From Roman Tudos (2015-07-02):
# http://lex.justice.md/index.php?action=view&view=doc&lang=1&id=355077
# From Paul Eggert (2015-07-01):
# The above-mentioned official link to IGO1445-868/2014 states that
# 2014-10-26's fallback transition occurred at 03:00 local time.  Also,
# https://www.trm.md/en/social/la-30-martie-vom-trece-la-ora-de-vara
# says the 2014-03-30 spring-forward transition was at 02:00 local time.
# Guess that since 1997 Moldova has switched one hour before the EU.

# From Heitor David Pinto (2026-02-22):
# Soviet Moldovan resolution 132 of 1990 defined the summer time period from
# the last Sunday in March at 2:00 to the last Sunday in September at 3:00,
# matching the dates used in most of Europe at the time:
# https://web.archive.org/web/20211107050832/http://lex.justice.md/viewdoc.php?action=view&view=doc&id=298782&lang=1
#
# It seems that in 1996 Moldova changed the end date to October like most of
# Europe, but kept the transitions at 2:00 and 3:00 rather than 1:00 UTC,
# which would have been locally 3:00 and 4:00....
#
# The notices in the Moldovan government website and broadcaster showed the
# transitions at 2:00 and 3:00 until 2021:
# 2015 https://old.gov.md/en/node/7304
# 2016 https://old.gov.md/en/node/12587
# 2017 https://old.gov.md/en/node/20654
# 2017 https://old.gov.md/en/content/moldova-upholds-winter-time-night-28-29-october
# 2018 https://old.gov.md/en/content/moldova-switch-summer-time
# 2018 https://old.gov.md/en/content/cabinet-ministers-informs-about-switch-winter-time-28-october
# 2019 https://old.gov.md/en/content/moldova-switch-summer-time-31-march
# 2019 https://old.gov.md/en/node/31122
# 2020 https://old.gov.md/en/node/32771
# 2020 https://old.gov.md/en/node/34497
# 2021 https://trm.md/ro/social/moldova-trece-in-aceasta-noapte-la-ora-de-vara
# 2021 https://trm.md/en/social/republica-moldova-trece-la-ora-de-iarna1
#
# However, since 2022, the notices showed the transitions at 3:00 and 4:00,
# matching the EU rule at 1:00 UTC:
# 2022 https://trm.md/en/social/in-acest-weekend-republica-moldova-trece-la-ora-de-vara
# 2022 https://old.gov.md/en/content/moldova-switch-winter-time
# 2023 https://moldova1.md/p/6587/ora-de-vara-2023-cum-schimbam-acele-ceasornicelor-si-cand-trecem-la-ora-de-vara
# 2023 https://old.gov.md/en/node/46662
# 2024 https://moldova1.md/p/26535/republica-moldova-trece-la-ora-de-vara-in-acest-weekend
# 2024 https://moldova1.md/p/37768/republica-moldova-trece-in-aceasta-noapte-la-ora-de-iarna
# 2025 https://moldova1.md/p/46349/republica-moldova-trece-la-ora-de-vara-pe-30-martie-cum-ne-afecteaza-si-ce-recomanda-medicii
# 2025 https://moldova1.md/p/60469/republica-moldova-trece-la-ora-de-iarna-ceasurile-se-dau-inapoi-cu-o-ora
#
# It seems that the changes to the end date and transition times were just
# done in practice without formally changing the resolution. In late 2025, the
# government said that the Soviet resolution was still in force, and proposed
# a new resolution to replace it and formally establish the EU rule:
# ... based on the notices, it seems that in practice Moldova already
# uses the EU rule since 2022. This was also the year when Moldova applied to
# join the EU.
#
# From Robert Bastian (2026-02-26):
# This has been approved and published in the government gazette:
# https://monitorul.gov.md/ro/monitorul/view/pdf/3234/part/2#page=27
#
# From Paul Eggert (2026-02-24):
# Also see Svetlana Rudenko, "Moldova abandons the 'Soviet era'", Logos Press,
# 2026-02-21 <https://logos-pres.md/en/news/moldova-abandons-the-soviet-era/>.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Moldova	1997	2021	-	Mar	lastSun	 2:00	1:00	S
Rule	Moldova	1997	2021	-	Oct	lastSun	 3:00	0	-

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Chisinau	1:55:20 -	LMT	1880
			1:55	-	CMT	1918 Feb 15 # Chisinau MT
			1:44:24	-	BMT	1931 Jul 24 # Bucharest MT
			2:00	Romania	EE%sT	1940 Aug 15
			2:00	1:00	EEST	1941 Jul 17
			1:00	C-Eur	CE%sT	1944 Aug 24
			3:00	Russia	MSK/MSD	1990 May  6  2:00
			2:00	Russia	EE%sT	1992
			2:00	E-Eur	EE%sT	1997
# See Romania commentary for the guessed 1997 transition to EU rules.
			2:00	Moldova	EE%sT	2022
			2:00	EU	EE%sT

# Poland

# The 1919 dates and times can be found in Tygodnik Urzędowy nr 1 (1919-03-20),
# <http://www.wbc.poznan.pl/publication/32156> pp 1-2.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Poland	1918	1919	-	Sep	16	2:00s	0	-
Rule	Poland	1919	only	-	Apr	15	2:00s	1:00	S
Rule	Poland	1944	only	-	Apr	 3	2:00s	1:00	S
# Whitman gives 1944 Nov 30; go with Shanks & Pottenger.
Rule	Poland	1944	only	-	Oct	 4	2:00	0	-
# For 1944-1948 Whitman gives the previous day; go with Shanks & Pottenger.
Rule	Poland	1945	only	-	Apr	29	0:00	1:00	S
Rule	Poland	1945	only	-	Nov	 1	0:00	0	-
# For 1946 on the source is Kazimierz Borkowski,
# Toruń Center for Astronomy, Dept. of Radio Astronomy, Nicolaus Copernicus U.,
# https://www.astro.uni.torun.pl/~kb/Artykuly/U-PA/Czas2.htm#tth_tAb1
# Thanks to Przemysław Augustyniak (2005-05-28) for this reference.
# He also gives these further references:
# Mon Pol nr 13, poz 162 (1995) <http://www.abc.com.pl/serwis/mp/1995/0162.htm>
# Druk nr 2180 (2003) <http://www.senat.gov.pl/k5/dok/sejm/053/2180.pdf>
Rule	Poland	1946	only	-	Apr	14	0:00s	1:00	S
Rule	Poland	1946	only	-	Oct	 7	2:00s	0	-
Rule	Poland	1947	only	-	May	 4	2:00s	1:00	S
Rule	Poland	1947	1949	-	Oct	Sun>=1	2:00s	0	-
Rule	Poland	1948	only	-	Apr	18	2:00s	1:00	S
Rule	Poland	1949	only	-	Apr	10	2:00s	1:00	S
Rule	Poland	1957	only	-	Jun	 2	1:00s	1:00	S
Rule	Poland	1957	1958	-	Sep	lastSun	1:00s	0	-
Rule	Poland	1958	only	-	Mar	30	1:00s	1:00	S
Rule	Poland	1959	only	-	May	31	1:00s	1:00	S
Rule	Poland	1959	1961	-	Oct	Sun>=1	1:00s	0	-
Rule	Poland	1960	only	-	Apr	 3	1:00s	1:00	S
Rule	Poland	1961	1964	-	May	lastSun	1:00s	1:00	S
Rule	Poland	1962	1964	-	Sep	lastSun	1:00s	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Warsaw	1:24:00 -	LMT	1880
			1:24:00	-	WMT	1915 Aug  5 # Warsaw Mean Time
			1:00	C-Eur	CE%sT	1918 Sep 16  3:00
			2:00	Poland	EE%sT	1922 Jun
			1:00	Poland	CE%sT	1940 Jun 23  2:00
			1:00	C-Eur	CE%sT	1944 Oct
			1:00	Poland	CE%sT	1977
			1:00	W-Eur	CE%sT	1988
			1:00	EU	CE%sT

# Portugal

# From Tim Parenti (2024-07-01), per Alois Treindl (2021-02-07) and Michael
# Deckers (2021-02-10):
# http://oal.ul.pt/documentos/2018/01/hl1911a2018.pdf/
# The Astronomical Observatory of Lisbon has published a list detailing the
# historical transitions in legal time within continental Portugal.  It
# directly references many decrees and ordinances which are, in turn,
# referenced below.  They can be viewed in the public archives of the Diário da
# República (until 1976-04-09 known as the Diário do Govêrno) at
# https://dre.pt/ (in Portuguese).
#
# Most of the Rules below have been updated simply to match the Observatory's
# listing for continental (mainland) Portugal.  Although there are over 50
# referenced decrees and ordinances, only the handful with comments below have
# been verified against the text, typically to provide additional confidence
# wherever dates provided by Whitman and Shanks & Pottenger had disagreed.
# See further below for the Azores and Madeira.

# From Tim Parenti (2024-07-01), per Paul Eggert (2014-08-11), after a
# heads-up from Stephen Colebourne:
# According to a 1911-05-24 Portuguese decree, Lisbon was at -0:36:44.68, but
# switched to GMT on 1912-01-01 at 00:00.
# https://dre.pt/dr/detalhe/decreto/593090
# https://dre.pt/application/conteudo/593090
# The decree made legal time throughout Portugal and her possessions
# "subordinate to the Greenwich meridian, according to the principle adopted at
# the Washington Convention in 1884" and eliminated the "difference of five
# minutes between the internal and external clocks of railway stations".
#
# The decree was gazetted in the 1911-05-30 issue of Diário do Govêrno, and is
# considered to be dated 1911-05-24 by that issue's summary; however, the text
# of the decree itself is dated 1911-05-26.  The Diário da República website
# notes the discrepancy, but later laws and the Observatory all seem to refer
# to this decree by the 1911-05-24 date.
#
# From Michael Deckers (2018-02-15):
# article 5 [of the 1911 decree; Deckers's translation] ...:
# These dispositions shall enter into force at the instant at which,
# according to the 2nd article, the civil day January 1, 1912 begins,
# all clocks therefore having to be advanced or set back correspondingly ...

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
# From Tim Parenti (2024-07-01):
# Decreto 1469 of 1915-03-30 ... had nothing to do with DST;
# rather it regulated the sending of time signals.
# But we do see linkage to Spain in the 1920s below.
# https://dre.pt/dr/detalhe/decreto/1469-1915-285721
# https://dre.pt/application/conteudo/285721
#
# According to the Observatory, standard time was first advanced by Decreto
# 2433 of 1916-06-09 and restored by Decreto 2712 of 1916-10-28.  While Whitman
# gives 1916-10-31 for the latter transition, Shanks & Pottenger agrees more
# closely with the decree, which stated that its provision "will start sixty
# minutes after the end of 31 October, according to the current time," i.e.,
# 01:00 on 1 November.
# https://dre.pt/dr/detalhe/decreto/2433-1916-267192
# https://dre.pt/application/conteudo/267192
# https://dre.pt/dr/detalhe/decreto/2712-1916-590937
# https://dre.pt/application/conteudo/590937
Rule	Port	1916	only	-	Jun	17	23:00	1:00	S
Rule	Port	1916	only	-	Nov	 1	 1:00	0	-
# From Tim Parenti (2024-07-01):
# Article 7 of Decreto 2922 of 1916-12-30 stated that "the legal time will be
# advanced by sixty minutes from 1 March to 31 October."  Per Article 15, this
# came into force from 1917-01-01.  Just before the first fall back, Decreto
# 3446 of 1917-10-11 changed the annual end date to 14 October.
# https://dre.pt/dr/detalhe/decreto/2922-1916-261894
# https://dre.pt/application/conteudo/261894
# https://dre.pt/dr/detalhe/decreto/3446-1917-495161
# https://dre.pt/application/conteudo/495161
# This annual change was revoked by Decreto 8038 of 1922-02-18.
# https://dre.pt/dr/detalhe/decreto/8038-1922-569751
# https://dre.pt/application/conteudo/569751
Rule	Port	1917	1921	-	Mar	 1	 0:00	1:00	S
Rule	Port	1917	1921	-	Oct	14	24:00	0	-
# From Tim Parenti (2024-07-01):
# Decreto 9592 of 1924-04-14 noted that "France maintains the advance of legal
# time in the summer and Spain has now adopted it for the first time" and
# considered "that the absence of similar measures would cause serious
# difficulties for international rail connections with consequent repercussions
# on domestic service hours..." along with "inconvenient analogues...for postal
# and telegraph services."  Summer time would be in effect from 17 April to 4
# October, with the spring change explicitly specified by bringing clocks
# forward from 16 April 23:00.
# https://dre.pt/dr/detalhe/decreto/9592-1924-652133
# https://dre.pt/application/conteudo/652133
#
# Decreto 10700, issued 1925-04-16, noted that Spain had not continued summer
# time, declared that "the current legal hour prior to 17 April remains
# unchanged from that day forward", and revoked legislation to the contrary,
# just a day before summer time would have otherwise resumed.
# https://dre.pt/dr/detalhe/decreto/10700-1925-437826
# https://dre.pt/application/conteudo/437826
Rule	Port	1924	only	-	Apr	16	23:00s	1:00	S
Rule	Port	1924	only	-	Oct	 4	23:00s	0	-
Rule	Port	1926	only	-	Apr	17	23:00s	1:00	S
Rule	Port	1926	1929	-	Oct	Sat>=1	23:00s	0	-
Rule	Port	1927	only	-	Apr	 9	23:00s	1:00	S
Rule	Port	1928	only	-	Apr	14	23:00s	1:00	S
Rule	Port	1929	only	-	Apr	20	23:00s	1:00	S
Rule	Port	1931	only	-	Apr	18	23:00s	1:00	S
# Whitman gives 1931 Oct 8; go with Shanks & Pottenger.
Rule	Port	1931	1932	-	Oct	Sat>=1	23:00s	0	-
Rule	Port	1932	only	-	Apr	 2	23:00s	1:00	S
Rule	Port	1934	only	-	Apr	 7	23:00s	1:00	S
# Whitman gives 1934 Oct 5; go with Shanks & Pottenger.
# Note: The 1935 law specified 10-06 00:00, not 10-05 24:00, but the following
# is equivalent and more succinct.
Rule	Port	1934	1938	-	Oct	Sat>=1	23:00s	0	-
# Shanks & Pottenger give 1935 Apr 30; go with Whitman.
Rule	Port	1935	only	-	Mar	30	23:00s	1:00	S
Rule	Port	1936	only	-	Apr	18	23:00s	1:00	S
# Whitman gives 1937 Apr 2; go with Shanks & Pottenger.
Rule	Port	1937	only	-	Apr	 3	23:00s	1:00	S
Rule	Port	1938	only	-	Mar	26	23:00s	1:00	S
Rule	Port	1939	only	-	Apr	15	23:00s	1:00	S
# Whitman gives 1939 Oct 7; go with Shanks & Pottenger.
Rule	Port	1939	only	-	Nov	18	23:00s	0	-
# From Tim Parenti (2024-07-01):
# Portaria 9465 of 1940-02-17 advanced clocks from Saturday 1940-02-24 23:00.
# The clocks were restored by Portaria 9658, issued Monday 1940-10-07,
# effective from 24:00 that very night, which agrees with Shanks & Pottenger;
# Whitman gives Saturday 1940-10-05 instead.
# https://dre.pt/dr/detalhe/portaria/9465-1940-189096
# https://dre.pt/application/conteudo/189096
# https://dre.pt/dr/detalhe/portaria/9658-1940-196729
# https://dre.pt/application/conteudo/196729
Rule	Port	1940	only	-	Feb	24	23:00s	1:00	S
Rule	Port	1940	only	-	Oct	 7	23:00s	0	-
Rule	Port	1941	only	-	Apr	 5	23:00s	1:00	S
Rule	Port	1941	only	-	Oct	 5	23:00s	0	-
Rule	Port	1942	1945	-	Mar	Sat>=8	23:00s	1:00	S
Rule	Port	1942	only	-	Apr	25	22:00s	2:00	M # Midsummer
Rule	Port	1942	only	-	Aug	15	22:00s	1:00	S
Rule	Port	1942	1945	-	Oct	Sat>=24	23:00s	0	-
Rule	Port	1943	only	-	Apr	17	22:00s	2:00	M
Rule	Port	1943	1945	-	Aug	Sat>=25	22:00s	1:00	S
Rule	Port	1944	1945	-	Apr	Sat>=21	22:00s	2:00	M
Rule	Port	1946	only	-	Apr	Sat>=1	23:00s	1:00	S
Rule	Port	1946	only	-	Oct	Sat>=1	23:00s	0	-
# From Tim Parenti (2024-07-01), per Alois Treindl (2021-02-07):
# The Astronomical Observatory of Lisbon cites Portaria 11767 of 1947-03-28 for
# 1947 and Portaria 12286 of 1948-02-19 for 1948.
# https://dre.pt/dr/detalhe/portaria/11767-1947-414787
# https://dre.pt/application/conteudo/414787
# https://dre.pt/dr/detalhe/portaria/12286-1948-152953
# https://dre.pt/application/conteudo/152953
#
# Although the latter ordinance explicitly had the 1948-10-03 transition
# scheduled for 02:00 rather than 03:00 as had been used in 1947, Decreto-Lei
# 37048 of 1948-09-07 recognized "that it is advisable to definitely set...the
# 'summer time' regime", and fixed the fall transition at 03:00 moving forward.
# https://dre.pt/dr/detalhe/decreto-lei/37048-1948-373810
# https://dre.pt/application/conteudo/373810
# While the Observatory only cites this act for 1949-1965 and not for 1948, it
# does not appear to have had any provision delaying its effect, so assume that
# it overrode the prior ordinance for 1948-10-03.
#
# Whitman says DST was not observed in 1950 and gives Oct lastSun for 1952 on.
# The Observatory, however, agrees with Shanks & Pottenger that 1950 was not an
# exception and that Oct Sun>=1 was maintained through 1965.
Rule	Port	1947	1966	-	Apr	Sun>=1	 2:00s	1:00	S
Rule	Port	1947	1965	-	Oct	Sun>=1	 2:00s	0	-
# From Tim Parenti (2024-07-01):
# Decreto-Lei 47233 of 1966-10-01 considered that the "duality" in time was
# "the cause of serious disturbances" and noted that "the countries with which
# we have the most frequent contacts...have already adopted" a solution
# coinciding with the extant "summer time".  It established that the former
# "summer time" would apply year-round on the mainland and adjacent islands
# with immediate effect, as the fall back would have otherwise occurred later
# that evening.
# https://dre.pt/dr/detalhe/decreto-lei/47233-1966-293729
# Model this by changing zones without changing clocks at the
# previously-appointed fall back time.
#
# Decreto-Lei 309/76 of 1976-04-27 acknowledged that those international
# contacts had returned to adopting seasonal times, and considered that the
# year-round advancement "entails considerable sacrifices for the vast majority
# of the working population during the winter months", including morning
# visibility concerns for schoolchildren.  It specified, beginning 1976-09-26
# 01:00, an annual return to UT+00 on the mainland from 00:00 UT on Sep lastSun
# to 00:00 UT on Mar lastSun (unless the latter date fell on Easter, in which
# case it was to be brought forward to the preceding Sunday).  It also assigned
# the Permanent Time Commission to study and propose revisions for the Azores
# and Madeira, neither of which resumed DST until 1982 (as described further
# below).
# https://dre.pt/dr/detalhe/decreto-lei/309-1976-502063
Rule	Port	1976	only	-	Sep	lastSun	 1:00	0	-
Rule	Port	1977	only	-	Mar	lastSun	 0:00s	1:00	S
Rule	Port	1977	only	-	Sep	lastSun	 0:00s	0	-
# From Tim Parenti (2024-07-01):
# Beginning in 1978, rather than triggering the Easter rule of the 1976 decree
# (Easter fell on 1978-03-26), Article 5 was used instead, which allowed DST
# dates to be changed by order of the Minister of Education and Scientific
# Research, upon consultation with the Permanent Time Commission, "whenever
# considered convenient."  As such, a series of one-off ordinances were
# promulgated for the mainland in 1978 through 1980, after which the 1976
# decree naturally came back into force from 1981.
Rule	Port	1978	1980	-	Apr	Sun>=1	 1:00s	1:00	S
Rule	Port	1978	only	-	Oct	 1	 1:00s	0	-
Rule	Port	1979	1980	-	Sep	lastSun	 1:00s	0	-
Rule	Port	1981	1986	-	Mar	lastSun	 0:00s	1:00	S
Rule	Port	1981	1985	-	Sep	lastSun	 0:00s	0	-
# From Tim Parenti (2024-07-01):
# Decreto-Lei 44-B/86 of 1986-03-07 switched mainland Portugal's transition
# times from 0:00s to 1:00u to harmonize with the EEC from 1986-03-30.
# https://dre.pt/dr/detalhe/decreto-lei/44-b-1986-628280
# (Transitions of 1:00s as previously reported and used by the W-Eur rules,
# though equivalent, appear to have been fiction here.)  Madeira continued to
# use 0:00s for spring 1986 before joining with the mainland using 1:00u in the
# fall; meanwhile, in the Azores the two were equivalent, so the law specifying
# 0:00s wasn't touched until 1992.  (See below for more on the islands.)
#
# From Rui Pedro Salgueiro (1992-11-12):
# Portugal has recently (September, 27) changed timezone
# (from WET to MET or CET) to harmonize with EEC.
#
# Martin Bruckmann (1996-02-29) reports via Peter Ilieve
# that Portugal is reverting to 0:00 by not moving its clocks this spring.
# The new Prime Minister was fed up with getting up in the dark in the winter.
#
# From Paul Eggert (1996-11-12):
# IATA SSIM (1991-09) reports several 1991-09 and 1992-09 transitions
# at 02:00u, not 01:00u.  Assume that these are typos.
#
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
		#STDOFF	-0:36:44.68
Zone	Europe/Lisbon	-0:36:45 -	LMT	1884
			-0:36:45 -	LMT	1912 Jan  1  0:00u # Lisbon MT
			 0:00	Port	WE%sT	1966 Oct  2  2:00s
			 1:00	-	CET	1976 Sep 26  1:00
			 0:00	Port	WE%sT	1986
			 0:00	EU	WE%sT	1992 Sep 27  1:00u
			 1:00	EU	CE%sT	1996 Mar 31  1:00u
			 0:00	EU	WE%sT

# From Tim Parenti (2024-07-01):
# For the Azores and Madeira, legislation was followed from the laws currently
# in force as listed at:
# https://oal.ul.pt/hora-legal/legislacao/
# working backward through references of revocation and abrogation to
# Decreto-Lei 47233 of 1966-10-01, the last time DST was abolished across the
# mainland and its adjacent islands.
#
# From Tim Parenti (2026-05-26):
# Observance of DST on the Azores and Madeira was explicitly covered by
# mainland legislation in:
# - Portaria 11767 of 1947-03-28 for 1947,
# - Portaria 12286 of 1948-02-19 for 1948, and
# - Decreto-Lei 37048 of 1948-09-07 through its revocation in 1966.
# (See mainland commentary, above.)  However, most legislation prior to 1947
# didn't explicitly call out these "adjacent islands", so we assume that DST
# rules on the islands prior to 1947 were also like that of the mainland.
Zone Atlantic/Azores	-1:42:40 -	LMT	1884        # Ponta Delgada
			-1:54:32 -	HMT	1912 Jan  1  2:00u # Horta MT
# Vanguard section, for zic and other parsers that support %z.
			-2:00	Port	%z	1966 Oct  2  2:00s
# From Tim Parenti (2024-07-01):
# While Decreto-Lei 309/76 of 1976-04-27 reintroduced DST on the mainland by
# falling back on 1976-09-26, it assigned the Permanent Time Commission to
# study and propose revisions for the Azores and Madeira.  Decreto Regional
# 9/77/A of 1977-05-17 affirmed that "the legal time remained unchanged in the
# Azores" at UT-1, and would remain there year-round.
# https://dre.pt/dr/detalhe/decreto-regional/9-1977-252066
#
# Decreto Regional 2/82/A, published 1982-03-02, adopted DST in the same
# fashion as the mainland used at the time.
# https://dre.pt/dr/detalhe/decreto-regional/2-1982-599965
# Though transitions in the Azores officially remained at 0:00s through 1992,
# this was equivalent to the EU-style 1:00u adopted by the mainland in 1986, so
# model it as such.
			-1:00	-	%z	1982 Mar 28  0:00s
			-1:00	Port	%z	1986
# Rearguard section, for parsers lacking %z; see ziguard.awk.
#			-2:00	Port	-02/-01	1942 Apr 25 22:00s
#			-2:00	Port	+00	1942 Aug 15 22:00s
#			-2:00	Port	-02/-01	1943 Apr 17 22:00s
#			-2:00	Port	+00	1943 Aug 28 22:00s
#			-2:00	Port	-02/-01	1944 Apr 22 22:00s
#			-2:00	Port	+00	1944 Aug 26 22:00s
#			-2:00	Port	-02/-01	1945 Apr 21 22:00s
#			-2:00	Port	+00	1945 Aug 25 22:00s
#			-2:00	Port	-02/-01	1966 Oct  2  2:00s
#			-1:00	-	-01	1982 Mar 28  0:00s
#			-1:00	Port	-01/+00	1986
# End of rearguard section.
#
# From Paul Eggert (1996-11-12):
# IATA SSIM (1991/1992) reports that the Azores were at -1:00.
# IATA SSIM (1993-02) says +0:00; later issues (through 1996-09) say -1:00.
#
# From Tim Parenti (2024-07-01):
# After mainland Portugal had shifted forward an hour from 1992-09-27, Decreto
# Legislativo Regional 29/92/A of 1992-12-23 sought to "reduce the time
# difference" by shifting the Azores forward as well from 1992-12-27.  Just six
# months later, this was revoked by Decreto Legislativo Regional 9/93/A, citing
# "major changes in work habits and way of life."  Though the revocation didn't
# give a transition time, it was signed Wednesday 1993-06-16; assume it took
# effect later that evening, and that an EU-style spring forward (to +01) was
# still observed in the interim on 1993-03-28.
# https://dre.pt/dr/detalhe/decreto-legislativo-regional/29-1992-621553
# https://dre.pt/dr/detalhe/decreto-legislativo-regional/9-1993-389633
			-1:00	EU	%z	1992 Dec 27  1:00s
			 0:00	EU	WE%sT	1993 Jun 17  1:00u
			-1:00	EU	%z

Zone Atlantic/Madeira	-1:07:36 -	LMT	1884        # Funchal
			-1:07:36 -	FMT	1912 Jan  1  1:00u # Funchal MT
# Vanguard section, for zic and other parsers that support %z.
			-1:00	Port	%z	1966 Oct  2  2:00s
# Rearguard section, for parsers lacking %z; see ziguard.awk.
#			-1:00	Port	-01/+00	1942 Apr 25 22:00s
#			-1:00	Port	+01	1942 Aug 15 22:00s
#			-1:00	Port	-01/+00	1943 Apr 17 22:00s
#			-1:00	Port	+01	1943 Aug 28 22:00s
#			-1:00	Port	-01/+00	1944 Apr 22 22:00s
#			-1:00	Port	+01	1944 Aug 26 22:00s
#			-1:00	Port	-01/+00	1945 Apr 21 22:00s
#			-1:00	Port	+01	1945 Aug 25 22:00s
#			-1:00	Port	-01/+00	1966 Oct  2  2:00s
# End of rearguard section.
#
# From Tim Parenti (2024-07-01):
# Decreto Regional 5/82/M, published 1982-04-03, established DST transitions at
# 0:00u, which for Madeira is equivalent to the mainland's rules (0:00s) at the
# time.  It came into effect the day following its publication, Sunday
# 1982-04-04, thus resuming Madeira's DST practice about a week later than the
# mainland and the Azores.
# https://dre.pt/dr/detalhe/decreto-regional/5-1982-608273
#
# Decreto Legislativo Regional 18/86/M, published 1986-10-01, adopted EU-style
# rules (1:00u) and entered into immediate force after being signed on
# 1986-07-31.
# https://dre.pt/dr/detalhe/decreto-legislativo-regional/18-1986-221705
			 0:00	-	WET	1982 Apr  4
			 0:00	Port	WE%sT	1986 Jul 31
			 0:00	EU	WE%sT

# Romania
#
# From Paul Eggert (1999-10-07):
# Nine O'clock <http://www.nineoclock.ro/POL/1778pol.html>
# (1998-10-23) reports that the switch occurred at
# 04:00 local time in fall 1998.  For lack of better info,
# assume that Romania switched to EU rules in 1997,
# the same year as Bulgaria.
#
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Romania	1932	only	-	May	21	 0:00s	1:00	S
Rule	Romania	1932	1939	-	Oct	Sun>=1	 0:00s	0	-
Rule	Romania	1933	1939	-	Apr	Sun>=2	 0:00s	1:00	S
Rule	Romania	1979	only	-	May	27	 0:00	1:00	S
Rule	Romania	1979	only	-	Sep	lastSun	 0:00	0	-
Rule	Romania	1980	only	-	Apr	 5	23:00	1:00	S
Rule	Romania	1980	only	-	Sep	lastSun	 1:00	0	-
Rule	Romania	1991	1993	-	Mar	lastSun	 0:00s	1:00	S
Rule	Romania	1991	1993	-	Sep	lastSun	 0:00s	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone Europe/Bucharest	1:44:24 -	LMT	1891 Oct
			1:44:24	-	BMT	1931 Jul 24 # Bucharest MT
			2:00	Romania	EE%sT	1981 Mar 29  2:00s
			2:00	C-Eur	EE%sT	1991
			2:00	Romania	EE%sT	1994
			2:00	E-Eur	EE%sT	1997
			2:00	EU	EE%sT


# Russia

# From Alexander Krivenyshev (2011-09-15):
# Based on last Russian Government Decree No. 725 on August 31, 2011
# (Government document
# http://www.government.ru/gov/results/16355/print/
# in Russian)
# there are few corrections have to be made for some Russian time zones...
# All updated Russian Time Zones were placed in table and translated to English
# by WorldTimeZone.com at the link below:
# http://www.worldtimezone.com/dst_news/dst_news_russia36.htm

# From Sanjeev Gupta (2011-09-27):
# Scans of [Decree No. 23 of January 8, 1992] are available at:
# http://government.consultant.ru/page.aspx?1223966
# They are in Cyrillic letters (presumably Russian).

# From Arthur David Olson (2012-05-09):
# Regarding the instant when clocks in time-zone-shifting parts of Russia
# changed in September 2011:
#
# One source is
# http://government.ru/gov/results/16355/
# which, according to translate.google.com, begins "Decree of August 31,
# 2011 No. 725" and contains no other dates or "effective date" information.
#
# Another source is
# https://rg.ru/2011/09/06/chas-zona-dok.html
# which, according to translate.google.com, begins "Resolution of the
# Government of the Russian Federation on August 31, 2011 N 725" and also
# contains "Date first official publication: September 6, 2011 Posted on:
# in the 'RG' - Federal Issue No. 5573 September 6, 2011" but which
# does not contain any "effective date" information.
#
# Another source is
# https://en.wikipedia.org/wiki/Oymyakonsky_District#cite_note-RuTime-7
# which, in note 8, contains "Resolution No. 725 of August 31, 2011...
# Effective as of after 7 days following the day of the official publication"
# but which does not contain any reference to September 6, 2011.
#
# The Wikipedia article refers to
# http://base.consultant.ru/cons/cgi/online.cgi?req=doc;base=LAW;n=118896
# which seems to copy the text of the government.ru page.
#
# Tobias Conradi combines Wikipedia's
# "as of after 7 days following the day of the official publication"
# with www.rg.ru's "Date of first official publication: September 6, 2011" to
# get September 13, 2011 as the cutover date (unusually, a Tuesday, as Tobias
# Conradi notes).
#
# None of the sources indicates a time of day for changing clocks.
#
# Go with 2011-09-13 0:00s.

# From Alexander Krivenyshev (2014-07-01):
# According to the Russian news (ITAR-TASS News Agency)
# http://en.itar-tass.com/russia/738562
# the State Duma has approved ... the draft bill on returning to
# winter time standard and return Russia 11 time zones.  The new
# regulations will come into effect on October 26, 2014 at 02:00 ...
# http://asozd2.duma.gov.ru/main.nsf/(Spravka)?OpenAgent&RN=431985-6&02
# Here is a link where we put together table (based on approved Bill N
# 431985-6) with proposed 11 Russian time zones and corresponding
# areas/cities/administrative centers in the Russian Federation (in English):
# http://www.worldtimezone.com/dst_news/dst_news_russia65.html
#
# From Alexander Krivenyshev (2014-07-22):
# Putin signed the Federal Law 431985-6 ... (in Russian)
# http://itar-tass.com/obschestvo/1333711
# http://www.pravo.gov.ru:8080/page.aspx?111660
# http://www.kremlin.ru/acts/46279
# From October 26, 2014 the new Russian time zone map will look like this:
# http://www.worldtimezone.com/dst_news/dst_news_russia-map-2014-07.html

# From Paul Eggert (2006-03-22):
# Moscow time zone abbreviations after 1919-07-01, and Moscow rules after 1991,
# are from Andrey A. Chernov.  The rest is from Shanks & Pottenger,
# except we follow Chernov's report that 1992 DST transitions were Sat
# 23:00, not Sun 02:00s.
#
# From Stanislaw A. Kuzikowski (1994-06-29):
# But now it is some months since Novosibirsk is 3 hours ahead of Moscow!
# I do not know why they have decided to make this change;
# as far as I remember it was done exactly during winter->summer switching
# so we (Novosibirsk) simply did not switch.
#
# From Andrey A. Chernov (1996-10-04):
# 'MSK' and 'MSD' were born and used initially on Moscow computers with
# UNIX-like OSes by several developer groups (e.g. Demos group, Kiae group)....
# The next step was the UUCP network, the Relcom predecessor
# (used mainly for mail), and MSK/MSD was actively used there.
#
# From Chris Carrier (1996-10-30):
# According to a friend of mine who rode the Trans-Siberian Railroad from
# Moscow to Irkutsk in 1995, public air and rail transport in Russia ...
# still follows Moscow time, no matter where in Russia it is located.
#
# For Grozny, Chechnya, we have the following story from
# John Daniszewski, "Scavengers in the Rubble", Los Angeles Times (2001-02-07):
# News - often false - is spread by word of mouth.  A rumor that it was
# time to move the clocks back put this whole city out of sync with
# the rest of Russia for two weeks - even soldiers stationed here began
# enforcing curfew at the wrong time.
#
# From Gwillim Law (2001-06-05):
# There's considerable evidence that Sakhalin Island used to be in
# UTC+11, and has changed to UTC+10, in this decade.  I start with the
# SSIM, which listed Yuzhno-Sakhalinsk in zone RU10 along with Magadan
# until February 1997, and then in RU9 with Khabarovsk and Vladivostok
# since September 1997....  Although the Kuril Islands are
# administratively part of Sakhalin oblast', they appear to have
# remained on UTC+11 along with Magadan.

# From Marat Nigametzianov (2018-07-16):
# this is link to order from 1956 about timezone in USSR
# http://astro.uni-altai.ru/~orion/blog/2011/11/novyie-granitsyi-chasovyih-poyasov-v-sssr/
#
# From Paul Eggert (2018-07-16):
# Perhaps someone could translate the link mentioned above, and use it
# to correct our data for the ex-Soviet Union.  It cites the following:
# «Поясное время и новые границы часовых поясов» / сост. П.Н. Долгов,
# отв. ред. Г.Д. Бурдун - М: Комитет стандартов, мер и измерительных
# приборов при Совете Министров СССР, Междуведомственная комиссия
# единой службы времени, 1956 г.
# This book looks like it would be a helpful resource for the Soviet
# Union through 1956.  Although a copy was in the Scientific Library
# of Tomsk State University, I have not been able to track down a copy nearby.
#
# From Stepan Golosunov (2018-07-21):
# http://astro.uni-altai.ru/~orion/blog/2015/05/center-reforma-ischisleniya-vremeni-br-na-territorii-sssr-v-1957-godu-center/
# says that the 1956 decision to change time belts' borders was not
# implemented as planned in 1956 and the change happened in 1957.
# There is also the problem that actual time zones were different from
# the official time belts (and from many time belts' maps) as there were
# numerous exceptions to application of time belt rules.  For example,
# https://ru.wikipedia.org/wiki/Московское_время#Перемещение_границы_применения_московского_времени_на_восток
# says that by 1962 there were many regions in the 3rd time belt that
# were on Moscow time, referring to a 1962 map.  By 1989 number of such
# exceptions grew considerably.

# From Tim Parenti (2014-07-06):
# The comments detailing the coverage of each Russian zone are meant to assist
# with maintenance only and represent our best guesses as to which regions
# are covered by each zone.  They are not meant to be taken as an authoritative
# listing.  The region codes listed come from
# https://en.wikipedia.org/w/?title=Federal_subjects_of_Russia&oldid=611810498
# and are used for convenience only; no guarantees are made regarding their
# future stability.  ISO 3166-2:RU codes are also listed for first-level
# divisions where available.

# From Tim Parenti (2014-07-03):
# Europe/Kaliningrad covers...
# 39	RU-KGD	Kaliningrad Oblast

# From Paul Eggert (2019-07-25):
# Although Shanks lists 1945-01-01 as the date for transition from
# +01/+02 to +02/+03, more likely this is a placeholder.  Guess that
# the transition occurred at 1945-04-10 00:00, which is about when
# Königsberg surrendered to Soviet troops.  (Thanks to Alois Treindl.)

# From Paul Eggert (2016-03-18):
# The 1989 transition is from USSR act No. 227 (1989-03-14).

# From Stepan Golosunov (2016-03-07):
# http://www.rgo.ru/ru/kaliningradskoe-oblastnoe-otdelenie/ob-otdelenii/publikacii/kak-nam-zhilos-bez-letnego-vremeni
# confirms that the 1989 change to Moscow-1 was implemented.
# (The article, though, is misattributed to 1990 while saying that
# summer->winter transition would be done on the 24 of September. But
# 1990-09-24 was Monday, while 1989-09-24 was Sunday as expected.)
# ...
# http://www.kaliningradka.ru/site_pc/cherez/index.php?ELEMENT_ID=40091
# says that Kaliningrad switched to Moscow-1 on 1989-03-26, avoided
# at the last moment switch to Moscow-1 on 1991-03-31, switched to
# Moscow on 1991-11-03, switched to Moscow-1 on 1992-01-19.

Zone Europe/Kaliningrad	 1:22:00 -	LMT	1893 Apr
			 1:00	C-Eur	CE%sT	1945 Apr 10
			 2:00	Poland	EE%sT	1946 Apr  7
			 3:00	Russia	MSK/MSD	1989 Mar 26  2:00s
			 2:00	Russia	EE%sT	2011 Mar 27  2:00s
			 3:00	-	%z	2014 Oct 26  2:00s
			 2:00	-	EET


# From Paul Eggert (2016-02-21), per Tim Parenti (2014-07-03) and
# Oscar van Vlijmen (2001-08-25):
# Europe/Moscow covers...
# 01	RU-AD	Adygea, Republic of
# 05	RU-DA	Dagestan, Republic of
# 06	RU-IN	Ingushetia, Republic of
# 07	RU-KB	Kabardino-Balkar Republic
# 08	RU-KL	Kalmykia, Republic of
# 09	RU-KC	Karachay-Cherkess Republic
# 10	RU-KR	Karelia, Republic of
# 11	RU-KO	Komi Republic
# 12	RU-ME	Mari El Republic
# 13	RU-MO	Mordovia, Republic of
# 15	RU-SE	North Ossetia-Alania, Republic of
# 16	RU-TA	Tatarstan, Republic of
# 20	RU-CE	Chechen Republic
# 21	RU-CU	Chuvash Republic
# 23	RU-KDA	Krasnodar Krai
# 26	RU-STA	Stavropol Krai
# 29	RU-ARK	Arkhangelsk Oblast
# 31	RU-BEL	Belgorod Oblast
# 32	RU-BRY	Bryansk Oblast
# 33	RU-VLA	Vladimir Oblast
# 35	RU-VLG	Vologda Oblast
# 36	RU-VOR	Voronezh Oblast
# 37	RU-IVA	Ivanovo Oblast
# 40	RU-KLU	Kaluga Oblast
# 44	RU-KOS	Kostroma Oblast
# 46	RU-KRS	Kursk Oblast
# 47	RU-LEN	Leningrad Oblast
# 48	RU-LIP	Lipetsk Oblast
# 50	RU-MOS	Moscow Oblast
# 51	RU-MUR	Murmansk Oblast
# 52	RU-NIZ	Nizhny Novgorod Oblast
# 53	RU-NGR	Novgorod Oblast
# 57	RU-ORL	Oryol Oblast
# 58	RU-PNZ	Penza Oblast
# 60	RU-PSK	Pskov Oblast
# 61	RU-ROS	Rostov Oblast
# 62	RU-RYA	Ryazan Oblast
# 67	RU-SMO	Smolensk Oblast
# 68	RU-TAM	Tambov Oblast
# 69	RU-TVE	Tver Oblast
# 71	RU-TUL	Tula Oblast
# 76	RU-YAR	Yaroslavl Oblast
# 77	RU-MOW	Moscow
# 78	RU-SPE	Saint Petersburg
# 83	RU-NEN	Nenets Autonomous Okrug

# From Paul Eggert (2016-08-23):
# The Soviets switched to UT-based time in 1919.  Decree No. 59
# (1919-02-08) http://istmat.info/node/35567 established UT-based time
# zones, and Decree No. 147 (1919-03-29) http://istmat.info/node/35854
# specified a transition date of 1919-07-01, apparently at 00:00 UT.
# No doubt only the Soviet-controlled regions switched on that date;
# later transitions to UT-based time in other parts of Russia are
# taken from what appear to be guesses by Shanks.
# (Thanks to Alexander Belopolsky for pointers to the decrees.)

# From Stepan Golosunov (2016-03-07):
# 11. Regions-violators, 1981-1982.
# Wikipedia refers to
# http://maps.monetonos.ru/maps/raznoe/Old_Maps/Old_Maps/Articles/022/3_1981.html
# http://besp.narod.ru/nauka_1981_3.htm
#
# The second link provides two articles scanned from the Nauka i Zhizn
# magazine No. 3, 1981 and a scan of the short article attributed to
# the Trud newspaper from February 1982.  The first link provides the
# same Nauka i Zhizn articles converted to the text form (but misses
# time belt changes map).
#
# The second Nauka i Zhizn article says that in addition to
# introduction of summer time on 1981-04-01 there are some time belt
# border changes on 1981-10-01, mostly affecting Nenets Autonomous
# Okrug, Krasnoyarsk Krai, Yakutia, Magadan Oblast and Chukotka
# according to the provided map (colored one).  In addition to that
# "time violators" (regions which were not using rules of the time
# belts in which they were located) would not be moving off the DST on
# 1981-10-01 to restore the decree time usage.  (Komi ASSR was
# supposed to repeat that move in October 1982 to account for the 2
# hour difference.)  Map depicting "time violators" before 1981-10-01
# is also provided.
#
# The article from Trud says that 1981-10-01 changes caused problems
# and some territories would be moved to pre-1981-10-01 time by not
# moving to summer time on 1982-04-01.  Namely: Dagestan,
# Kabardino-Balkar, Kalmyk, Komi, Mari, Mordovian, North Ossetian,
# Tatar, Chechen-Ingush and Chuvash ASSR, Krasnodar and Stavropol
# krais, Arkhangelsk, Vladimir, Vologda, Voronezh, Gorky, Ivanovo,
# Kostroma, Lipetsk, Penza, Rostov, Ryazan, Tambov, Tyumen and
# Yaroslavl oblasts, Nenets and Evenk autonomous okrugs, Khatangsky
# district of Taymyr Autonomous Okrug.  As a result Evenk Autonomous
# Okrug and Khatangsky district of Taymyr Autonomous Okrug would end
# up on Moscow+4, Tyumen Oblast on Moscow+2 and the rest on Moscow
# time.
#
# http://astrozet.net/files/Zones/DOC/RU/1980-925.txt
# attributes the 1982 changes to the Act of the Council of Ministers
# of the USSR No. 126 from 18.02.1982.  1980-925.txt also adds
# Udmurtia to the list of affected territories and lists Khatangsky
# district separately from Taymyr Autonomous Okrug.  Probably erroneously.
#
# The affected territories are currently listed under Europe/Moscow,
# Asia/Yekaterinburg and Asia/Krasnoyarsk.
#
# 12. Udmurtia
# The fact that Udmurtia is depicted as a violator in the Nauka i
# Zhizn article hints at Izhevsk being on different time from
# Kuybyshev before 1981-10-01. Udmurtia is not mentioned in the 1989 act.
# http://astrozet.net/files/Zones/DOC/RU/1980-925.txt
# implies Udmurtia was on Moscow time after 1982-04-01.
# Wikipedia implies Udmurtia being on Moscow+1 until 1991.
#
# ...
#
# All Russian zones are supposed to have by default a -1 change at
# 1991-03-31 2:00 (cancellation of the decree time in the USSR) and a +1
# change at 1992-01-19 2:00 (restoration of the decree time in Russia).
#
# There were some exceptions, though.
# Wikipedia says newspapers listed Astrakhan, Saratov, Kirov, Volgograd,
# Izhevsk, Grozny, Kazan and Samara as such exceptions for the 1992
# change. (Different newspapers providing different lists. And some
# lists found in the internet are quite wild.)
#
# And apparently some exceptions were reverted in the last moment.
# http://www.kaliningradka.ru/site_pc/cherez/index.php?ELEMENT_ID=40091
# says that Kaliningrad decided not to be an exception 2 days before the
# 1991-03-31 switch and one person at
# https://izhevsk.ru/forum_light_message/50/682597-m8369040.html
# says he remembers that Samara opted out of the 1992-01-19 exception
# 2 days before the switch.
#
# From Alois Treindl (2022-02-15):
# the Russian wikipedia page
# https://ru.wikipedia.org/wiki/Московское_время#Перемещение_границы_применения_московского_времени_на_восток
# contains the sentence (in Google translation) "In the autumn of
# 1981, Arkhangelsk, Vologda, Yaroslavl, Ivanovo, Vladimir, Ryazan,
# Lipetsk, Voronezh, Rostov-on-Don, Krasnodar and regions to the east
# of those named (about 30 in total) parted ways with Moscow time.
# However, the convenience of common time with Moscow turned out to be
# decisive - in 1982, these regions again switched to Moscow time."
# Shanks International atlas has similar information, and also the
# Russian book Zaitsev A., Kutalev D. A new astrologer's reference
# book. Coordinates of cities and time corrections, - The World of
# Urania, 2012 (Russian: Зайцев А., Куталёв Д., Новый справочник
# астролога. Координаты городов и временные поправки).
# To me it seems that an extra zone is needed, which starts with LMT
# util 1919, later follows Moscow since 1930, but deviates from it
# between 1 October 1981 until 1 April 1982.
#
#
# From Paul Eggert (2022-02-15):
# Given the above, we appear to be missing some Zone entries for the
# chaotic early 1980s in Russia.  It's not clear what these entries
# should be.  For now, sweep this under the rug and just document the
# time in Moscow.

# From Vladimir Karpinsky (2014-07-08):
# LMT in Moscow (before Jul 3, 1916) is 2:30:17, that was defined by Moscow
# Observatory (coordinates: 55° 45' 29.70", 37° 34' 05.30")....
# LMT in Moscow since Jul 3, 1916 is 2:31:01 as a result of new standard.
# (The info is from the book by Byalokoz ... p. 18.)
# The time in St. Petersburg as capital of Russia was defined by
# Pulkov observatory, near St. Petersburg.  In 1916 LMT Moscow
# was synchronized with LMT St. Petersburg (+30 minutes), (Pulkov observatory
# coordinates: 59° 46' 18.70", 30° 19' 40.70") so 30° 19' 40.70" >
# 2h01m18.7s = 2:01:19.  LMT Moscow = LMT St.Petersburg + 30m 2:01:19 + 0:30 =
# 2:31:19 ...
#
# From Paul Eggert (2014-07-08):
# Milne does not list Moscow, but suggests that its time might be listed in
# Résumés mensuels et annuels des observations météorologiques (1895).
# Presumably this is OCLC 85825704, a journal published with parallel text in
# Russian and French.  This source has not been located; go with Karpinsky.

Zone Europe/Moscow	 2:30:17 -	LMT	1880
			 2:30:17 -	MMT	1916 Jul  3 # Moscow Mean Time
			 2:31:19 Russia	%s	1919 Jul  1  0:00u
			 3:00	Russia	%s	1921 Oct
			 3:00	Russia	MSK/MSD	1922 Oct
			 2:00	-	EET	1930 Jun 21
			 3:00	Russia	MSK/MSD	1991 Mar 31  2:00s
			 2:00	Russia	EE%sT	1992 Jan 19  2:00s
			 3:00	Russia	MSK/MSD	2011 Mar 27  2:00s
			 4:00	-	MSK	2014 Oct 26  2:00s
			 3:00	-	MSK


# From Paul Eggert (2016-12-06):
# Europe/Simferopol covers Crimea.

Zone Europe/Simferopol	 2:16:24 -	LMT	1880
			 2:16	-	SMT	1924 May  2 # Simferopol Mean T
			 2:00	-	EET	1930 Jun 21
			 3:00	-	MSK	1941 Nov
			 1:00	C-Eur	CE%sT	1944 Apr 13
			 3:00	Russia	MSK/MSD	1990
			 3:00	-	MSK	1990 Jul  1  2:00
			 2:00	-	EET	1992 Mar 20
# Central Crimea used Moscow time 1994/1997.
#
# From Paul Eggert (2022-07-21):
# The _Economist_ (1994-05-28, p 45) reported that central Crimea switched
# from Kyiv to Moscow time sometime after the January 1994 elections.
# Shanks (1999) says "date of change uncertain", but implies that it happened
# sometime between the 1994 DST switches.  Shanks & Pottenger simply say
# 1994-09-25 03:00, but that can't be right.  For now, guess it
# changed in May.  This change evidently didn't last long; see below.
			 2:00	C-Eur	EE%sT	1994 May
# From IATA SSIM (1994/1997), which also said that Kerch is still like Kyiv.
			 3:00	C-Eur	MSK/MSD	1996 Mar 31  0:00s
			 3:00	1:00	MSD	1996 Oct 27  3:00s
# IATA SSIM (1997-09) said Crimea switched to EET/EEST.
# Assume it happened in March by not changing the clocks.
			 3:00	-	MSK	1997 Mar lastSun  1:00u
# From Alexander Krivenyshev (2014-03-17):
# time change at 2:00 (2am) on March 30, 2014
# https://vz.ru/news/2014/3/17/677464.html
# From Tim Parenti (2022-07-01), per Paul Eggert (2014-03-30):
# The clocks at the railway station in Simferopol were put forward from 22:00
# to 24:00 the previous day in a "symbolic ceremony"; however, per
# contemporaneous news reports, "ordinary Crimeans [made] the daylight savings
# time switch at 2am" on Sunday.
# https://www.business-standard.com/article/pti-stories/crimea-to-set-clocks-to-russia-time-114033000014_1.html
# https://www.reuters.com/article/us-ukraine-crisis-crimea-time/crimea-switches-to-moscow-time-amid-incorporation-frenzy-idUKBREA2S0LT20140329
# https://www.bbc.com/news/av/world-europe-26806583
			 2:00	EU	EE%sT	2014 Mar 30  2:00
			 4:00	-	MSK	2014 Oct 26  2:00s
			 3:00	-	MSK


# From Paul Eggert (2016-03-18):
# Europe/Astrakhan covers:
# 30	RU-AST	Astrakhan Oblast
#
# The 1989 transition is from USSR act No. 227 (1989-03-14).

# From Alexander Krivenyshev (2016-01-12):
# On February 10, 2016 Astrakhan Oblast got approval by the Federation
# Council to change its time zone to UTC+4 (from current UTC+3 Moscow time)....
# This Federal Law shall enter into force on 27 March 2016 at 02:00.
# From Matt Johnson (2016-03-09):
# http://publication.pravo.gov.ru/Document/View/0001201602150056

Zone Europe/Astrakhan	 3:12:12 -	LMT	1924 May
			 3:00	-	%z	1930 Jun 21
			 4:00	Russia	%z	1989 Mar 26  2:00s
			 3:00	Russia	%z	1991 Mar 31  2:00s
			 4:00	-	%z	1992 Mar 29  2:00s
			 3:00	Russia	%z	2011 Mar 27  2:00s
			 4:00	-	%z	2014 Oct 26  2:00s
			 3:00	-	%z	2016 Mar 27  2:00s
			 4:00	-	%z

# From Paul Eggert (2016-11-11):
# Europe/Volgograd covers:
# 34	RU-VGG	Volgograd Oblast
# The 1988 transition is from USSR act No. 5 (1988-01-04).

# From Alexander Fetisov (2018-09-20):
# Volgograd region in southern Russia (Europe/Volgograd) change
# timezone from UTC+3 to UTC+4 from 28oct2018.
# http://sozd.parliament.gov.ru/bill/452878-7
#
# From Stepan Golosunov (2018-10-11):
# The law has been published today on
# http://publication.pravo.gov.ru/Document/View/0001201810110037

# From Alexander Krivenyshev (2020-11-27):
# The State Duma approved (Nov 24, 2020) the transition of the Volgograd
# region to the Moscow time zone....
# https://sozd.duma.gov.ru/bill/1012130-7
#
# From Stepan Golosunov (2020-12-05):
# Currently proposed text for the second reading (expected on December 8) ...
# changes the date to December 27. https://v1.ru/text/gorod/2020/12/04/69601031/
#
# From Stepan Golosunov (2020-12-22):
# The law was published today on
# http://publication.pravo.gov.ru/Document/View/0001202012220002

Zone Europe/Volgograd	 2:57:40 -	LMT	1920 Jan  3
			 3:00	-	%z	1930 Jun 21
			 4:00	-	%z	1961 Nov 11
			 4:00	Russia	%z	1988 Mar 27  2:00s
			 3:00	Russia	MSK/MSD	1991 Mar 31  2:00s
			 4:00	-	%z	1992 Mar 29  2:00s
			 3:00	Russia	MSK/MSD	2011 Mar 27  2:00s
			 4:00	-	MSK	2014 Oct 26  2:00s
			 3:00	-	MSK	2018 Oct 28  2:00s
			 4:00	-	%z	2020 Dec 27  2:00s
			 3:00	-	MSK

# From Paul Eggert (2016-11-11):
# Europe/Saratov covers:
# 64	RU-SAR	Saratov Oblast

# From Yuri Konotopov (2016-11-11):
# Dec 4, 2016 02:00 UTC+3....  Saratov Region's local time will be ... UTC+4.
# From Stepan Golosunov (2016-11-11):
# ... Byalokoz listed Saratov on 03:04:18.
# From Stepan Golosunov (2016-11-22):
# http://publication.pravo.gov.ru/Document/View/0001201611220031

Zone Europe/Saratov	 3:04:18 -	LMT	1919 Jul  1  0:00u
			 3:00	-	%z	1930 Jun 21
			 4:00	Russia	%z	1988 Mar 27  2:00s
			 3:00	Russia	%z	1991 Mar 31  2:00s
			 4:00	-	%z	1992 Mar 29  2:00s
			 3:00	Russia	%z	2011 Mar 27  2:00s
			 4:00	-	%z	2014 Oct 26  2:00s
			 3:00	-	%z	2016 Dec  4  2:00s
			 4:00	-	%z

# From Paul Eggert (2016-03-18):
# Europe/Kirov covers:
# 43	RU-KIR	Kirov Oblast
# The 1989 transition is from USSR act No. 227 (1989-03-14).
#
Zone Europe/Kirov	 3:18:48 -	LMT	1919 Jul  1  0:00u
			 3:00	-	%z	1930 Jun 21
			 4:00	Russia	%z	1989 Mar 26  2:00s
			 3:00	Russia	MSK/MSD	1991 Mar 31  2:00s
			 4:00	-	%z	1992 Mar 29  2:00s
			 3:00	Russia	MSK/MSD	2011 Mar 27  2:00s
			 4:00	-	MSK	2014 Oct 26  2:00s
			 3:00	-	MSK

# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
# Europe/Samara covers...
# 18	RU-UD	Udmurt Republic
# 63	RU-SAM	Samara Oblast

# From Paul Eggert (2016-03-18):
# Byalokoz 1919 says Samara was 3:20:20.
# The 1989 transition is from USSR act No. 227 (1989-03-14).

Zone Europe/Samara	 3:20:20 -	LMT	1919 Jul  1  0:00u
			 3:00	-	%z	1930 Jun 21
			 4:00	-	%z	1935 Jan 27
			 4:00	Russia	%z	1989 Mar 26  2:00s
			 3:00	Russia	%z	1991 Mar 31  2:00s
			 2:00	Russia	%z	1991 Sep 29  2:00s
			 3:00	-	%z	1991 Oct 20  3:00
			 4:00	Russia	%z	2010 Mar 28  2:00s
			 3:00	Russia	%z	2011 Mar 27  2:00s
			 4:00	-	%z

# From Paul Eggert (2016-03-18):
# Europe/Ulyanovsk covers:
# 73	RU-ULY	Ulyanovsk Oblast

# The 1989 transition is from USSR act No. 227 (1989-03-14).

# From Alexander Krivenyshev (2016-02-17):
# Ulyanovsk ... on their way to change time zones by March 27, 2016 at 2am.
# Ulyanovsk Oblast ... from MSK to MSK+1 (UTC+3 to UTC+4) ...
# 920582-6 ... 02/17/2016 The State Duma passed the bill in the first reading.
# From Matt Johnson (2016-03-09):
# http://publication.pravo.gov.ru/Document/View/0001201603090051

Zone Europe/Ulyanovsk	 3:13:36 -	LMT	1919 Jul  1  0:00u
			 3:00	-	%z	1930 Jun 21
			 4:00	Russia	%z	1989 Mar 26  2:00s
			 3:00	Russia	%z	1991 Mar 31  2:00s
			 2:00	Russia	%z	1992 Jan 19  2:00s
			 3:00	Russia	%z	2011 Mar 27  2:00s
			 4:00	-	%z	2014 Oct 26  2:00s
			 3:00	-	%z	2016 Mar 27  2:00s
			 4:00	-	%z

# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
# Asia/Yekaterinburg covers...
# 02	RU-BA	Bashkortostan, Republic of
# 90	RU-PER	Perm Krai
# 45	RU-KGN	Kurgan Oblast
# 56	RU-ORE	Orenburg Oblast
# 66	RU-SVE	Sverdlovsk Oblast
# 72	RU-TYU	Tyumen Oblast
# 74	RU-CHE	Chelyabinsk Oblast
# 86	RU-KHM	Khanty-Mansi Autonomous Okrug - Yugra
# 89	RU-YAN	Yamalo-Nenets Autonomous Okrug
#
# Note: Effective 2005-12-01, (59) Perm Oblast and (81) Komi-Permyak
# Autonomous Okrug merged to form (90, RU-PER) Perm Krai.

# Milne says Yekaterinburg was 4:02:32.9.
# Byalokoz 1919 says its provincial time was based on Perm, at 3:45:05.
# Assume it switched on 1916-07-03, the time of the new standard.
# The 1919 and 1930 transitions are from Shanks.

		#STDOFF	 4:02:32.9
Zone Asia/Yekaterinburg	 4:02:33 -	LMT	1916 Jul  3
			 3:45:05 -	PMT	1919 Jul 15  4:00
			 4:00	-	%z	1930 Jun 21
			 5:00	Russia	%z	1991 Mar 31  2:00s
			 4:00	Russia	%z	1992 Jan 19  2:00s
			 5:00	Russia	%z	2011 Mar 27  2:00s
			 6:00	-	%z	2014 Oct 26  2:00s
			 5:00	-	%z


# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
# Asia/Omsk covers...
# 55	RU-OMS	Omsk Oblast

# Byalokoz 1919 says Omsk was 4:53:30.

Zone Asia/Omsk		 4:53:30 -	LMT	1919 Nov 14
			 5:00	-	%z	1930 Jun 21
			 6:00	Russia	%z	1991 Mar 31  2:00s
			 5:00	Russia	%z	1992 Jan 19  2:00s
			 6:00	Russia	%z	2011 Mar 27  2:00s
			 7:00	-	%z	2014 Oct 26  2:00s
			 6:00	-	%z

# From Paul Eggert (2016-02-22):
# Asia/Barnaul covers:
# 04	RU-AL	Altai Republic
# 22	RU-ALT	Altai Krai

# Data before 1991 are from Shanks & Pottenger.

# From Stepan Golosunov (2016-03-07):
# Letter of Bank of Russia from 1995-05-25
# http://www.bestpravo.ru/rossijskoje/lj-akty/y3a.htm
# suggests that Altai Republic transitioned to Moscow+3 on
# 1995-05-28.
#
# https://regnum.ru/news/society/1957270.html
# has some historical data for Altai Krai:
# before 1957: west part on UT+6, east on UT+7
# after 1957: UT+7
# since 1995: UT+6
# http://barnaul.rusplt.ru/index/pochemu_altajskij_kraj_okazalsja_v_neprivychnom_chasovom_pojase-17648.html
# confirms that and provides more details including 1995-05-28 transition date.

# From Alexander Krivenyshev (2016-02-17):
# Altai Krai and Altai Republic on their way to change time zones
# by March 27, 2016 at 2am....
# Altai Republic / Gorno-Altaysk MSK+3 to MSK+4 (UTC+6 to UTC+7) ...
# Altai Krai / Barnaul MSK+3 to MSK+4 (UTC+6 to UTC+7)
# From Matt Johnson (2016-03-09):
# http://publication.pravo.gov.ru/Document/View/0001201603090043
# http://publication.pravo.gov.ru/Document/View/0001201603090038

Zone Asia/Barnaul	 5:35:00 -	LMT	1919 Dec 10
			 6:00	-	%z	1930 Jun 21
			 7:00	Russia	%z	1991 Mar 31  2:00s
			 6:00	Russia	%z	1992 Jan 19  2:00s
			 7:00	Russia	%z	1995 May 28
			 6:00	Russia	%z	2011 Mar 27  2:00s
			 7:00	-	%z	2014 Oct 26  2:00s
			 6:00	-	%z	2016 Mar 27  2:00s
			 7:00	-	%z

# From Paul Eggert (2016-03-18):
# Asia/Novosibirsk covers:
# 54	RU-NVS	Novosibirsk Oblast

# From Stepan Golosunov (2016-05-30):
# http://asozd2.duma.gov.ru/main.nsf/(Spravka)?OpenAgent&RN=1085784-6
# moves Novosibirsk oblast from UTC+6 to UTC+7.
# From Stepan Golosunov (2016-07-04):
# The law was signed yesterday and published today on
# http://publication.pravo.gov.ru/Document/View/0001201607040064

Zone Asia/Novosibirsk	 5:31:40 -	LMT	1919 Dec 14  6:00
			 6:00	-	%z	1930 Jun 21
			 7:00	Russia	%z	1991 Mar 31  2:00s
			 6:00	Russia	%z	1992 Jan 19  2:00s
			 7:00	Russia	%z	1993 May 23 # say Shanks & P.
			 6:00	Russia	%z	2011 Mar 27  2:00s
			 7:00	-	%z	2014 Oct 26  2:00s
			 6:00	-	%z	2016 Jul 24  2:00s
			 7:00	-	%z

# From Paul Eggert (2016-03-18):
# Asia/Tomsk covers:
# 70	RU-TOM	Tomsk Oblast

# From Stepan Golosunov (2016-03-24):
# Byalokoz listed Tomsk at 5:39:51.

# From Stanislaw A. Kuzikowski (1994-06-29):
# Tomsk is still 4 hours ahead of Moscow.

# From Stepan Golosunov (2016-03-19):
# http://pravo.gov.ru/proxy/ips/?docbody=&nd=102075743
# (fifth time belt being UTC+5+1(decree time)
# / UTC+5+1(decree time)+1(summer time)) ...
# Note that time belts (numbered from 2 (Moscow) to 12 according to their
# GMT/UTC offset and having too many exceptions like regions formally
# belonging to one belt but using time from another) were replaced
# with time zones in 2011 with different numbering (there was a
# 2-hour gap between second and third zones in 2011-2014).

# From Stepan Golosunov (2016-04-12):
# http://asozd2.duma.gov.ru/main.nsf/(SpravkaNew)?OpenAgent&RN=1006865-6
# This bill was approved in the first reading today.  It moves Tomsk oblast
# from UTC+6 to UTC+7 and is supposed to come into effect on 2016-05-29 at
# 2:00.  The bill needs to be approved in the second and the third readings by
# the State Duma, approved by the Federation Council, signed by the President
# and published to become a law.  Minor changes in the text are to be expected
# before the second reading (references need to be updated to account for the
# recent changes).
#
# Judging by the ultra-short one-day amendments period, recent similar laws,
# the State Duma schedule and the Federation Council schedule
# http://www.duma.gov.ru/legislative/planning/day-shedule/por_vesna_2016/
# http://council.gov.ru/activity/meetings/schedule/63303
# I speculate that the final text of the bill will be proposed tomorrow, the
# bill will be approved in the second and the third readings on Friday,
# approved by the Federation Council on 2016-04-20, signed by the President and
# published as a law around 2016-04-26.

# From Matt Johnson (2016-04-26):
# http://publication.pravo.gov.ru/Document/View/0001201604260048

Zone	Asia/Tomsk	 5:39:51 -	LMT	1919 Dec 22
			 6:00	-	%z	1930 Jun 21
			 7:00	Russia	%z	1991 Mar 31  2:00s
			 6:00	Russia	%z	1992 Jan 19  2:00s
			 7:00	Russia	%z	2002 May  1  3:00
			 6:00	Russia	%z	2011 Mar 27  2:00s
			 7:00	-	%z	2014 Oct 26  2:00s
			 6:00	-	%z	2016 May 29  2:00s
			 7:00	-	%z


# From Tim Parenti (2014-07-03):
# Asia/Novokuznetsk covers...
# 42	RU-KEM	Kemerovo Oblast

# From Alexander Krivenyshev (2009-10-13):
# Kemerovo oblast' (Kemerovo region) in Russia will change current time zone on
# March 28, 2010:
# from current Russia Zone 6 - Krasnoyarsk Time Zone (KRA) UTC +0700
# to Russia Zone 5 - Novosibirsk Time Zone (NOV) UTC +0600
#
# This is according to Government of Russia decree No. 740, on September
# 14, 2009 "Application in the territory of the Kemerovo region the Fifth
# time zone." ("Russia Zone 5" or old "USSR Zone 5" is GMT +0600)
#
# Russian Government web site (Russian language)
# http://www.government.ru/content/governmentactivity/rfgovernmentdecisions/archive/2009/09/14/991633.htm
# or Russian-English translation by WorldTimeZone.com with reference
# map to local region and new Russia Time Zone map after March 28, 2010
# http://www.worldtimezone.com/dst_news/dst_news_russia03.html
#
# Thus, when Russia will switch to DST on the night of March 28, 2010
# Kemerovo region (Kemerovo oblast') will not change the clock.

# From Tim Parenti (2014-07-02), per Alexander Krivenyshev (2014-07-02):
# The Kemerovo region will remain at UTC+7 through the 2014-10-26 change, thus
# realigning itself with KRAT.

Zone Asia/Novokuznetsk	 5:48:48 -	LMT	1924 May  1
			 6:00	-	%z	1930 Jun 21
			 7:00	Russia	%z	1991 Mar 31  2:00s
			 6:00	Russia	%z	1992 Jan 19  2:00s
			 7:00	Russia	%z	2010 Mar 28  2:00s
			 6:00	Russia	%z	2011 Mar 27  2:00s
			 7:00	-	%z

# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
# Asia/Krasnoyarsk covers...
# 17	RU-TY	Tuva Republic
# 19	RU-KK	Khakassia, Republic of
# 24	RU-KYA	Krasnoyarsk Krai
#
# Note: Effective 2007-01-01, (88) Evenk Autonomous Okrug and (84) Taymyr
# Autonomous Okrug were merged into (24, RU-KYA) Krasnoyarsk Krai.

# Byalokoz 1919 says Krasnoyarsk was 6:11:26.

Zone Asia/Krasnoyarsk	 6:11:26 -	LMT	1920 Jan  6
			 6:00	-	%z	1930 Jun 21
			 7:00	Russia	%z	1991 Mar 31  2:00s
			 6:00	Russia	%z	1992 Jan 19  2:00s
			 7:00	Russia	%z	2011 Mar 27  2:00s
			 8:00	-	%z	2014 Oct 26  2:00s
			 7:00	-	%z


# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
# Asia/Irkutsk covers...
# 03	RU-BU	Buryatia, Republic of
# 38	RU-IRK	Irkutsk Oblast
#
# Note: Effective 2008-01-01, (85) Ust-Orda Buryat Autonomous Okrug was
# merged into (38, RU-IRK) Irkutsk Oblast.

# Milne 1899 says Irkutsk was 6:57:15.
# Byalokoz 1919 says Irkutsk was 6:57:05.
# Go with Byalokoz.

Zone Asia/Irkutsk	 6:57:05 -	LMT	1880
			 6:57:05 -	IMT	1920 Jan 25 # Irkutsk Mean Time
			 7:00	-	%z	1930 Jun 21
			 8:00	Russia	%z	1991 Mar 31  2:00s
			 7:00	Russia	%z	1992 Jan 19  2:00s
			 8:00	Russia	%z	2011 Mar 27  2:00s
			 9:00	-	%z	2014 Oct 26  2:00s
			 8:00	-	%z


# From Tim Parenti (2014-07-06):
# Asia/Chita covers...
# 92	RU-ZAB	Zabaykalsky Krai
#
# Note: Effective 2008-03-01, (75) Chita Oblast and (80) Agin-Buryat
# Autonomous Okrug merged to form (92, RU-ZAB) Zabaykalsky Krai.

# From Alexander Krivenyshev (2016-01-02):
# [The] time zone in the Trans-Baikal Territory (Zabaykalsky Krai) -
# Asia/Chita [is changing] from UTC+8 to UTC+9.  Effective date will
# be March 27, 2016 at 2:00am....
# http://publication.pravo.gov.ru/Document/View/0001201512300107

Zone Asia/Chita	 7:33:52 -	LMT	1919 Dec 15
			 8:00	-	%z	1930 Jun 21
			 9:00	Russia	%z	1991 Mar 31  2:00s
			 8:00	Russia	%z	1992 Jan 19  2:00s
			 9:00	Russia	%z	2011 Mar 27  2:00s
			10:00	-	%z	2014 Oct 26  2:00s
			 8:00	-	%z	2016 Mar 27  2:00
			 9:00	-	%z


# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2009-11-29):
# Asia/Yakutsk covers...
# 28	RU-AMU	Amur Oblast
#
# ...and parts of (14, RU-SA) Sakha (Yakutia) Republic:
# 14-02	****	Aldansky District
# 14-04	****	Amginsky District
# 14-05	****	Anabarsky District
# 14-06	****	Bulunsky District
# 14-07	****	Verkhnevilyuysky District
# 14-10	****	Vilyuysky District
# 14-11	****	Gorny District
# 14-12	****	Zhigansky District
# 14-13	****	Kobyaysky District
# 14-14	****	Lensky District
# 14-15	****	Megino-Kangalassky District
# 14-16	****	Mirninsky District
# 14-18	****	Namsky District
# 14-19	****	Neryungrinsky District
# 14-21	****	Nyurbinsky District
# 14-23	****	Olenyoksky District
# 14-24	****	Olyokminsky District
# 14-26	****	Suntarsky District
# 14-27	****	Tattinsky District
# 14-29	****	Ust-Aldansky District
# 14-32	****	Khangalassky District
# 14-33	****	Churapchinsky District
# 14-34	****	Eveno-Bytantaysky National District

# From Tim Parenti (2014-07-03):
# Our commentary seems to have lost mention of (14-19) Neryungrinsky District.
# Since the surrounding districts of Sakha are all YAKT, assume this is, too.
# Also assume its history has been the same as the rest of Asia/Yakutsk.

# Byalokoz 1919 says Yakutsk was 8:38:58.

Zone Asia/Yakutsk	 8:38:58 -	LMT	1919 Dec 15
			 8:00	-	%z	1930 Jun 21
			 9:00	Russia	%z	1991 Mar 31  2:00s
			 8:00	Russia	%z	1992 Jan 19  2:00s
			 9:00	Russia	%z	2011 Mar 27  2:00s
			10:00	-	%z	2014 Oct 26  2:00s
			 9:00	-	%z


# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2009-11-29):
# Asia/Vladivostok covers...
# 25	RU-PRI	Primorsky Krai
# 27	RU-KHA	Khabarovsk Krai
# 79	RU-YEV	Jewish Autonomous Oblast
#
# ...and parts of (14, RU-SA) Sakha (Yakutia) Republic:
# 14-09	****	Verkhoyansky District
# 14-31	****	Ust-Yansky District

# Milne 1899 says Vladivostok was 8:47:33.5.
# Byalokoz 1919 says Vladivostok was 8:47:31.
# Go with Byalokoz.

Zone Asia/Vladivostok	 8:47:31 -	LMT	1922 Nov 15
			 9:00	-	%z	1930 Jun 21
			10:00	Russia	%z	1991 Mar 31  2:00s
			 9:00	Russia	%z	1992 Jan 19  2:00s
			10:00	Russia	%z	2011 Mar 27  2:00s
			11:00	-	%z	2014 Oct 26  2:00s
			10:00	-	%z


# From Tim Parenti (2014-07-03):
# Asia/Khandyga covers parts of (14, RU-SA) Sakha (Yakutia) Republic:
# 14-28	****	Tomponsky District
# 14-30	****	Ust-Maysky District

# From Arthur David Olson (2022-03-21):
# Tomponsky and Ust-Maysky switched from Vladivostok time to Yakutsk time
# in 2011.

# From Paul Eggert (2012-11-25):
# Shanks and Pottenger (2003) has Khandyga on Yakutsk time.
# Make a wild guess that it switched to Vladivostok time in 2004.
# This transition is no doubt wrong, but we have no better info.

Zone Asia/Khandyga	 9:02:13 -	LMT	1919 Dec 15
			 8:00	-	%z	1930 Jun 21
			 9:00	Russia	%z	1991 Mar 31  2:00s
			 8:00	Russia	%z	1992 Jan 19  2:00s
			 9:00	Russia	%z	2004
			10:00	Russia	%z	2011 Mar 27  2:00s
			11:00	-	%z	2011 Sep 13  0:00s # Decree 725?
			10:00	-	%z	2014 Oct 26  2:00s
			 9:00	-	%z


# From Tim Parenti (2014-07-03):
# Asia/Sakhalin covers...
# 65	RU-SAK	Sakhalin Oblast
# ...with the exception of:
# 65-11	****	Severo-Kurilsky District (North Kuril Islands)

# From Matt Johnson (2016-02-22):
# Asia/Sakhalin is moving (in entirety) from UTC+10 to UTC+11 ...
# (2016-03-09):
# http://publication.pravo.gov.ru/Document/View/0001201603090044

# The Zone name should be Asia/Yuzhno-Sakhalinsk, but that's too long.
Zone Asia/Sakhalin	 9:30:48 -	LMT	1905 Aug 23
			 9:00	-	%z	1945 Aug 25
			11:00	Russia	%z	1991 Mar 31  2:00s # Sakhalin T
			10:00	Russia	%z	1992 Jan 19  2:00s
			11:00	Russia	%z	1997 Mar lastSun  2:00s
			10:00	Russia	%z	2011 Mar 27  2:00s
			11:00	-	%z	2014 Oct 26  2:00s
			10:00	-	%z	2016 Mar 27  2:00s
			11:00	-	%z


# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2009-11-29):
# Asia/Magadan covers...
# 49	RU-MAG	Magadan Oblast

# From Tim Parenti (2014-07-06), per Alexander Krivenyshev (2014-07-02):
# Magadan Oblast is moving from UTC+12 to UTC+10 on 2014-10-26; however,
# several districts of Sakha Republic as well as Severo-Kurilsky District of
# the Sakhalin Oblast (also known as the North Kuril Islands), represented
# until now by Asia/Magadan, will instead move to UTC+11.  These regions will
# need their own zone.

# From Alexander Krivenyshev (2016-03-27):
# ... draft bill 948300-6 to change its time zone from UTC+10 to UTC+11 ...
# will take ... effect ... on April 24, 2016 at 2 o'clock
#
# From Matt Johnson (2016-04-05):
# ... signed by the President today ...
# http://publication.pravo.gov.ru/Document/View/0001201604050038

Zone Asia/Magadan	10:03:12 -	LMT	1924 May  2
			10:00	-	%z	1930 Jun 21 # Magadan Time
			11:00	Russia	%z	1991 Mar 31  2:00s
			10:00	Russia	%z	1992 Jan 19  2:00s
			11:00	Russia	%z	2011 Mar 27  2:00s
			12:00	-	%z	2014 Oct 26  2:00s
			10:00	-	%z	2016 Apr 24  2:00s
			11:00	-	%z


# From Tim Parenti (2014-07-06):
# Asia/Srednekolymsk covers parts of (14, RU-SA) Sakha (Yakutia) Republic:
# 14-01	****	Abyysky District
# 14-03	****	Allaikhovsky District
# 14-08	****	Verkhnekolymsky District
# 14-17	****	Momsky District
# 14-20	****	Nizhnekolymsky District
# 14-25	****	Srednekolymsky District
#
# ...and parts of (65, RU-SAK) Sakhalin Oblast:
# 65-11	****	Severo-Kurilsky District (North Kuril Islands)

# From Tim Parenti (2014-07-02):
# Oymyakonsky District of Sakha Republic (represented by Ust-Nera), along with
# most of Sakhalin Oblast (represented by Sakhalin) will be moving to UTC+10 on
# 2014-10-26 to stay aligned with VLAT/SAKT; however, Severo-Kurilsky District
# of the Sakhalin Oblast (also known as the North Kuril Islands, represented by
# Severo-Kurilsk) will remain on UTC+11.

# From Tim Parenti (2014-07-06):
# Assume North Kuril Islands have history like Magadan before 2011-03-27.
# There is a decent chance this is wrong, in which case a new zone
# Asia/Severo-Kurilsk would become necessary.
#
# Srednekolymsk and Zyryanka are the most populous places amongst these
# districts, but have very similar populations.  In fact, Wikipedia currently
# lists them both as having 3528 people, exactly 1668 males and 1860 females
# each!  (Yikes!)
# https://en.wikipedia.org/w/?title=Srednekolymsky_District&oldid=603435276
# https://en.wikipedia.org/w/?title=Verkhnekolymsky_District&oldid=594378493
# Assume this is a mistake, albeit an amusing one.
#
# Looking at censuses, the populations of the two municipalities seem to have
# fluctuated recently.  Zyryanka was more populous than Srednekolymsk in the
# 1989 and 2002 censuses, but Srednekolymsk was more populous in the most
# recent (2010) census, 3525 to 3170.  (See pages 195 and 197 of
# http://www.gks.ru/free_doc/new_site/perepis2010/croc/Documents/Vol1/pub-01-05.pdf
# in Russian.)  In addition, Srednekolymsk appears to be a much older
# settlement and the population of Zyryanka seems to be declining.
# Go with Srednekolymsk.

Zone Asia/Srednekolymsk	10:14:52 -	LMT	1924 May  2
			10:00	-	%z	1930 Jun 21
			11:00	Russia	%z	1991 Mar 31  2:00s
			10:00	Russia	%z	1992 Jan 19  2:00s
			11:00	Russia	%z	2011 Mar 27  2:00s
			12:00	-	%z	2014 Oct 26  2:00s
			11:00	-	%z


# From Tim Parenti (2014-07-03):
# Asia/Ust-Nera covers parts of (14, RU-SA) Sakha (Yakutia) Republic:
# 14-22	****	Oymyakonsky District

# From Arthur David Olson (2022-03-21):
# Oymyakonsky and the Kuril Islands switched from
# Magadan time to Vladivostok time in 2011.
#
# From Tim Parenti (2014-07-06), per Alexander Krivenyshev (2014-07-02):
# It's unlikely that any of the Kuril Islands were involved in such a switch,
# as the South and Middle Kurils have been on UTC+11 (SAKT) with the rest of
# Sakhalin Oblast since at least 2011-09, and the North Kurils have been on
# UTC+12 since at least then, too.

Zone Asia/Ust-Nera	 9:32:54 -	LMT	1919 Dec 15
			 8:00	-	%z	1930 Jun 21
			 9:00	Russia	%z	1981 Apr  1
			11:00	Russia	%z	1991 Mar 31  2:00s
			10:00	Russia	%z	1992 Jan 19  2:00s
			11:00	Russia	%z	2011 Mar 27  2:00s
			12:00	-	%z	2011 Sep 13  0:00s # Decree 725?
			11:00	-	%z	2014 Oct 26  2:00s
			10:00	-	%z


# From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
# Asia/Kamchatka covers...
# 91	RU-KAM	Kamchatka Krai
#
# Note: Effective 2007-07-01, (41) Kamchatka Oblast and (82) Koryak
# Autonomous Okrug merged to form (91, RU-KAM) Kamchatka Krai.

# The Zone name should be Asia/Petropavlovsk-Kamchatski or perhaps
# Asia/Petropavlovsk-Kamchatsky, but these are too long.
Zone Asia/Kamchatka	10:34:36 -	LMT	1922 Nov 10
			11:00	-	%z	1930 Jun 21
			12:00	Russia	%z	1991 Mar 31  2:00s
			11:00	Russia	%z	1992 Jan 19  2:00s
			12:00	Russia	%z	2010 Mar 28  2:00s
			11:00	Russia	%z	2011 Mar 27  2:00s
			12:00	-	%z


# From Tim Parenti (2014-07-03):
# Asia/Anadyr covers...
# 87	RU-CHU	Chukotka Autonomous Okrug

Zone Asia/Anadyr	11:49:56 -	LMT	1924 May  2
			12:00	-	%z	1930 Jun 21
			13:00	Russia	%z	1982 Apr  1  0:00s
			12:00	Russia	%z	1991 Mar 31  2:00s
			11:00	Russia	%z	1992 Jan 19  2:00s
			12:00	Russia	%z	2010 Mar 28  2:00s
			11:00	Russia	%z	2011 Mar 27  2:00s
			12:00	-	%z

# Bosnia & Herzegovina
# Croatia
# Kosovo
# Montenegro
# North Macedonia
# Serbia
# Slovenia
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Belgrade	1:22:00	-	LMT	1884
			1:00	-	CET	1941 Apr 18 23:00
			1:00	C-Eur	CE%sT	1945
			1:00	-	CET	1945 May  8  2:00s
			1:00	1:00	CEST	1945 Sep 16  2:00s
# Metod Koželj reports that the legal date of
# transition to EU rules was 1982-11-27, for all of Yugoslavia at the time.
# Shanks & Pottenger don't give as much detail, so go with Koželj.
			1:00	-	CET	1982 Nov 27
			1:00	EU	CE%sT

# Spain
#
# From Paul Eggert (2016-12-14):
#
# The source for Europe/Madrid before 2013 is:
# Planesas P. La hora oficial en España y sus cambios.
# Anuario del Observatorio Astronómico de Madrid (2013, in Spanish).
# http://astronomia.ign.es/rknowsys-theme/images/webAstro/paginas/documentos/Anuario/lahoraoficialenespana.pdf
# As this source says that historical time in the Canaries is obscure,
# and it does not discuss Ceuta, stick with Shanks for now for that data.
#
# In the 1918 and 1919 fallback transitions in Spain, the clock for
# the hour-longer day officially kept going after midnight, so that
# the repeated instances of that day's 00:00 hour were 24 hours apart,
# with a fallback transition from the second occurrence of 00:59... to
# the next day's 00:00.  Our data format cannot represent this
# directly, and instead repeats the first hour of the next day, with a
# fallback transition from the next day's 00:59... to 00:00.

# From Michael Deckers (2016-12-15):
# The Royal Decree of 1900-07-26 quoted by Planesas, online at
# https://www.boe.es/datos/pdfs/BOE//1900/209/A00383-00384.pdf
# says in its article 5 (my translation):
# These dispositions will enter into force beginning with the
# instant at which, according to the time indicated in article 1,
# the 1st day of January of 1901 will begin.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Spain	1918	only	-	Apr	15	23:00	1:00	S
Rule	Spain	1918	1919	-	Oct	 6	24:00s	0	-
Rule	Spain	1919	only	-	Apr	 6	23:00	1:00	S
Rule	Spain	1924	only	-	Apr	16	23:00	1:00	S
Rule	Spain	1924	only	-	Oct	 4	24:00s	0	-
Rule	Spain	1926	only	-	Apr	17	23:00	1:00	S
Rule	Spain	1926	1929	-	Oct	Sat>=1	24:00s	0	-
Rule	Spain	1927	only	-	Apr	 9	23:00	1:00	S
Rule	Spain	1928	only	-	Apr	15	 0:00	1:00	S
Rule	Spain	1929	only	-	Apr	20	23:00	1:00	S
# Republican Spain during the civil war; it controlled Madrid until 1939-03-28.
Rule	Spain	1937	only	-	Jun	16	23:00	1:00	S
Rule	Spain	1937	only	-	Oct	 2	24:00s	0	-
Rule	Spain	1938	only	-	Apr	 2	23:00	1:00	S
Rule	Spain	1938	only	-	Apr	30	23:00	2:00	M
Rule	Spain	1938	only	-	Oct	 2	24:00	1:00	S
# The following rules are for unified Spain again.
#
# Planesas does not say what happened in Madrid between its fall on
# 1939-03-28 and the Nationalist spring-forward transition on
# 1939-04-15.  For lack of better info, assume Madrid's clocks did not
# change during that period.
#
# The first rule is commented out, as it is redundant for Republican Spain.
#Rule	Spain	1939	only	-	Apr	15	23:00	1:00	S
Rule	Spain	1939	only	-	Oct	 7	24:00s	0	-
Rule	Spain	1942	only	-	May	 2	23:00	1:00	S
Rule	Spain	1942	only	-	Sep	 1	 1:00	0	-
Rule	Spain	1943	1946	-	Apr	Sat>=13	23:00	1:00	S
Rule	Spain	1943	1944	-	Oct	Sun>=1	 1:00	0	-
Rule	Spain	1945	1946	-	Sep	lastSun	 1:00	0	-
Rule	Spain	1949	only	-	Apr	30	23:00	1:00	S
Rule	Spain	1949	only	-	Oct	 2	 1:00	0	-
Rule	Spain	1974	1975	-	Apr	Sat>=12	23:00	1:00	S
Rule	Spain	1974	1975	-	Oct	Sun>=1	 1:00	0	-
Rule	Spain	1976	only	-	Mar	27	23:00	1:00	S
Rule	Spain	1976	1977	-	Sep	lastSun	 1:00	0	-
Rule	Spain	1977	only	-	Apr	 2	23:00	1:00	S
Rule	Spain	1978	only	-	Apr	 2	 2:00s	1:00	S
Rule	Spain	1978	only	-	Oct	 1	 2:00s	0	-
# Nationalist Spain during the civil war
#Rule NatSpain	1937	only	-	May	22	23:00	1:00	S
#Rule NatSpain	1937	1938	-	Oct	Sat>=1	24:00s	0	-
#Rule NatSpain	1938	only	-	Mar	26	23:00	1:00	S
# The following rules are copied from Morocco from 1967 through 1978,
# except with "S" letters.
Rule SpainAfrica 1967	only	-	Jun	 3	12:00	1:00	S
Rule SpainAfrica 1967	only	-	Oct	 1	 0:00	0	-
Rule SpainAfrica 1974	only	-	Jun	24	 0:00	1:00	S
Rule SpainAfrica 1974	only	-	Sep	 1	 0:00	0	-
Rule SpainAfrica 1976	1977	-	May	 1	 0:00	1:00	S
Rule SpainAfrica 1976	only	-	Aug	 1	 0:00	0	-
Rule SpainAfrica 1977	only	-	Sep	28	 0:00	0	-
Rule SpainAfrica 1978	only	-	Jun	 1	 0:00	1:00	S
Rule SpainAfrica 1978	only	-	Aug	 4	 0:00	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Madrid	-0:14:44 -	LMT	1901 Jan  1  0:00u
			 0:00	Spain	WE%sT	1940 Mar 16 23:00
			 1:00	Spain	CE%sT	1979
			 1:00	EU	CE%sT
Zone	Africa/Ceuta	-0:21:16 -	LMT	1901 Jan  1  0:00u
			 0:00	-	WET	1918 May  6 23:00
			 0:00	1:00	WEST	1918 Oct  7 23:00
			 0:00	-	WET	1924
			 0:00	Spain	WE%sT	1929
			 0:00	-	WET	1967 # Help zishrink.awk.
			 0:00 SpainAfrica WE%sT	1984 Mar 16
			 1:00	-	CET	1986
			 1:00	EU	CE%sT
Zone	Atlantic/Canary	-1:01:36 -	LMT	1922 Mar # Las Palmas de Gran C.
			-1:00	-	%z	1946 Sep 30  1:00
			 0:00	-	WET	1980 Apr  6  0:00s
			 0:00	1:00	WEST	1980 Sep 28  1:00u
			 0:00	EU	WE%sT
# IATA SSIM (1996-09) says the Canaries switch at 2:00u, not 1:00u.
# Ignore this for now, as the Canaries are part of the EU.


# Germany (Busingen enclave)
# Liechtenstein
# Switzerland
#
# From Howse:
# By the end of the 18th century clocks and watches became commonplace
# and their performance improved enormously.  Communities began to keep
# mean time in preference to apparent time - Geneva from 1780 ....
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
# From Whitman (who writes "Midnight?"):
# Rule	Swiss	1940	only	-	Nov	 2	0:00	1:00	S
# Rule	Swiss	1940	only	-	Dec	31	0:00	0	-
# From Shanks & Pottenger:
# Rule	Swiss	1941	1942	-	May	Sun>=1	2:00	1:00	S
# Rule	Swiss	1941	1942	-	Oct	Sun>=1	0:00	0	-

# From Alois Treindl (2008-12-17):
# I have researched the DST usage in Switzerland during the 1940ies.
#
# As I wrote in an earlier message, I suspected the current tzdata values
# to be wrong. This is now verified.
#
# I have found copies of the original ruling by the Swiss Federal
# government, in 'Eidgenössische Gesetzessammlung 1941 and 1942' (Swiss
# federal law collection)...
#
# DST began on Monday 5 May 1941, 1:00 am by shifting the clocks to 2:00 am
# DST ended on Monday 6 Oct 1941, 2:00 am by shifting the clocks to 1:00 am.
#
# DST began on Monday, 4 May 1942 at 01:00 am
# DST ended on Monday, 5 Oct 1942 at 02:00 am
#
# There was no DST in 1940, I have checked the law collection carefully.
# It is also indicated by the fact that the 1942 entry in the law
# collection points back to 1941 as a reference, but no reference to any
# other years are made.
#
# Newspaper articles I have read in the archives on 6 May 1941 reported
# about the introduction of DST (Sommerzeit in German) during the previous
# night as an absolute novelty, because this was the first time that such
# a thing had happened in Switzerland.
#
# I have also checked 1916, because one book source (Gabriel, Traité de
# l'heure dans le monde) claims that Switzerland had DST in 1916. This is
# false, no official document could be found. Probably Gabriel got misled
# by references to Germany, which introduced DST in 1916 for the first time.
#
# The tzdata rules for Switzerland must be changed to:
# Rule  Swiss   1941    1942    -       May     Mon>=1  1:00    1:00    S
# Rule  Swiss   1941    1942    -       Oct     Mon>=1  2:00    0       -
#
# The 1940 rules must be deleted.
#
# One further detail for Switzerland, which is probably out of scope for
# most users of tzdata: The [Europe/Zurich zone] ...
# describes all of Switzerland correctly, with the exception of
# the Canton de Genève (Geneva, Genf). Between 1848 and 1894 Geneva did not
# follow Bern Mean Time but kept its own local mean time.
# To represent this, an extra zone would be needed.
#
# From Alois Treindl (2013-09-11):
# The Federal regulations say
# https://www.admin.ch/opc/de/classified-compilation/20071096/index.html
# ... the meridian for Bern mean time ... is 7° 26' 22.50".
# Expressed in time, it is 0h29m45.5s.

# From Pierre-Yves Berger (2013-09-11):
# the "Circulaire du conseil fédéral" (December 11 1893)
# http://www.amtsdruckschriften.bar.admin.ch/viewOrigDoc.do?id=10071353
# clearly states that the [1894-06-01] change should be done at midnight
# but if no one is present after 11 at night, could be postponed until one
# hour before the beginning of service.

# From Paul Eggert (2024-05-24):
# Express BMT as 0:29:45.500, approximately the same precision 7° 26' 22.50".
#
# We can find no reliable source for Shanks's assertion that all of Switzerland
# except Geneva switched to Bern Mean Time at 00:00 on 1848-09-12.  This book:
#
#	Jakob Messerli. Gleichmässig, pünktlich, schnell. Zeiteinteilung und
#	Zeitgebrauch in der Schweiz im 19. Jahrhundert. Chronos, Zurich 1995,
#	ISBN 3-905311-68-2, OCLC 717570797.
#
# suggests that the transition was more gradual, and that the Swiss did not
# agree about civil time during the transition.  The timekeeping it gives the
# most detail for is postal and telegraph time: here, federal legislation (the
# "Bundesgesetz über die Erstellung von elektrischen Telegraphen") passed on
# 1851-11-23, and an official implementation notice was published 1853-07-16
# (Bundesblatt 1853, Bd. II, S. 859).  On p 72 Messerli writes that in
# practice since July 1853 Bernese time was used in "all postal and telegraph
# offices in Switzerland from Geneva to St. Gallen and Basel to Chiasso"
# (Google translation).  For now, model this transition as occurring on
# 1853-07-16, though it probably occurred at some other date in Zurich, and
# legal civil time probably changed at still some other transition date.

# From Tobias Conradi (2011-09-12):
# Büsingen <http://www.buesingen.de>, surrounded by the Swiss canton
# Schaffhausen, did not start observing DST in 1980 as the rest of DE
# (West Germany at that time) and DD (East Germany at that time) did.
# DD merged into DE, the area is currently covered by code DE in ISO 3166-1,
# which in turn is covered by the zone Europe/Berlin.
#
# Source for the time in Büsingen 1980:
# http://www.srf.ch/player/video?id=c012c029-03b7-4c2b-9164-aa5902cd58d3
#
# From Arthur David Olson (2012-03-03):
# Büsingen and Zurich have shared clocks since 1970.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Swiss	1941	1942	-	May	Mon>=1	1:00	1:00	S
Rule	Swiss	1941	1942	-	Oct	Mon>=1	2:00	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Zurich	0:34:08 -	LMT	1853 Jul 16 # See above comment.
		#STDOFF	0:29:45.500
			0:29:46	-	BMT	1894 Jun    # Bern Mean Time
			1:00	Swiss	CE%sT	1981
			1:00	EU	CE%sT

# Turkey

# From Alois Treindl (2019-08-12):
# http://www.astrolojidergisi.com/yazsaati.htm has researched the time zone
# history of Turkey, based on newspaper archives and official documents.
# From Paul Eggert (2019-08-28):
# That source (Oya Vulaş, "Türkiye'de Yaz Saati Uygulamaları")
# is used for 1940/1972, where it seems more reliable than our other
# sources.

# From Kıvanç Yazan (2019-08-12):
# http://www.resmigazete.gov.tr/arsiv/14539.pdf#page=24
# 1973-06-03 01:00 -> 02:00, 1973-11-04 02:00 -> 01:00
#
# http://www.resmigazete.gov.tr/arsiv/14829.pdf#page=1
# 1974-03-31 02:00 -> 03:00, 1974-11-03 02:00 -> 01:00
#
# http://www.resmigazete.gov.tr/arsiv/15161.pdf#page=1
# 1975-03-22 02:00 -> 03:00, 1975-11-02 02:00 -> 01:00
#
# http://www.resmigazete.gov.tr/arsiv/15535_1.pdf#page=1
# 1976-03-21 02:00 -> 03:00, 1976-10-31 02:00 -> 01:00
#
# http://www.resmigazete.gov.tr/arsiv/15778.pdf#page=5
# 1977-04-03 02:00 -> 03:00, 1977-10-16 02:00 -> 01:00,
# 1978-04-02 02:00 -> 03:00 (not applied, see below)
# 1978-10-15 02:00 -> 01:00 (not applied, see below)
# 1979-04-01 02:00 -> 03:00 (not applied, see below)
# 1979-10-14 02:00 -> 01:00 (not applied, see below)
#
# http://www.resmigazete.gov.tr/arsiv/16245.pdf#page=17
# This cancels the previous decision, and repeats it only for 1978.
# 1978-04-02 02:00 -> 03:00, 1978-10-15 02:00 -> 01:00
# (not applied due to standard TZ change below)
#
# http://www.resmigazete.gov.tr/arsiv/16331.pdf#page=3
# This decision changes the default longitude for Turkish time zone from 30
# degrees East to 45 degrees East.  This means a standard TZ change, from +2
# to +3.  This is published & applied on 1978-06-29.  At that time, Turkey was
# already on summer time (already on 45E).  Hence, this new law just meant an
# "continuous summer time".  Note that this was reversed in a few years.
#
# http://www.resmigazete.gov.tr/arsiv/18119_1.pdf#page=1
# 1983-07-31 02:00 -> 03:00 (note that this jumps TZ to +4)
# 1983-10-02 02:00 -> 01:00 (back to +3)
#
# http://www.resmigazete.gov.tr/arsiv/18561.pdf (page 1 and 34)
# At this time, Turkey is still on +3 with no spring-forward on early
# 1984.  This decision is published on 10/31/1984.  Page 1 declares
# the decision of reverting the "default longitude change".  So the
# standard time should go back to +3 (30E).  And page 34 explains when
# that will happen: 1984-11-01 02:00 -> 01:00.  You can think of this
# as "end of continuous summer time, change of standard time zone".
#
# http://www.resmigazete.gov.tr/arsiv/18713.pdf#page=1
# 1985-04-20 01:00 -> 02:00, 1985-09-28 02:00 -> 01:00

# From Kıvanç Yazan (2016-09-25):
# 1) For 1986-2006, DST started at 01:00 local and ended at 02:00 local, with
#    no exceptions.
# 2) 1994's lastSun was overridden with Mar 20 ...
# Here are official papers:
# http://www.resmigazete.gov.tr/arsiv/19032.pdf#page=2 for 1986
# http://www.resmigazete.gov.tr/arsiv/19400.pdf#page=4 for 1987
# http://www.resmigazete.gov.tr/arsiv/19752.pdf#page=15 for 1988
# http://www.resmigazete.gov.tr/arsiv/20102.pdf#page=6 for 1989
# http://www.resmigazete.gov.tr/arsiv/20464.pdf#page=1 for 1990 - 1992
# http://www.resmigazete.gov.tr/arsiv/21531.pdf#page=15 for 1993 - 1995
# http://www.resmigazete.gov.tr/arsiv/21879.pdf#page=1 for overriding 1994
# http://www.resmigazete.gov.tr/arsiv/22588.pdf#page=1 for 1996, 1997
# http://www.resmigazete.gov.tr/arsiv/23286.pdf#page=10 for 1998 - 2000
# http://www.resmigazete.gov.tr/eskiler/2001/03/20010324.htm#2  - for 2001
# http://www.resmigazete.gov.tr/eskiler/2002/03/20020316.htm#2  - for 2002-2006
# From Paul Eggert (2016-09-25):
# Prefer the above sources to Shanks & Pottenger for timestamps after 1985.

# From Steffen Thorsen (2007-03-09):
# Starting 2007 though, it seems that they are adopting EU's 1:00 UTC
# start/end time, according to the following page (2007-03-07):
# http://www.ntvmsnbc.com/news/402029.asp
# The official document is located here - it is in Turkish...:
# http://rega.basbakanlik.gov.tr/eskiler/2007/03/20070307-7.htm
# I was able to locate the following seemingly official document
# (on a non-government server though) describing dates between 2002 and 2006:
# http://www.alomaliye.com/bkk_2002_3769.htm

# From Gökdeniz Karadağ (2011-03-10):
# According to the articles linked below, Turkey will change into summer
# time zone (GMT+3) on March 28, 2011 at 3:00 a.m. instead of March 27.
# This change is due to a nationwide exam on 27th.
# https://www.worldbulletin.net/?aType=haber&ArticleID=70872
# Turkish:
# https://www.hurriyet.com.tr/yaz-saati-uygulamasi-bir-gun-ileri-alindi-17230464

# From Faruk Pasin (2014-02-14):
# The DST for Turkey has been changed for this year because of the
# Turkish Local election....
# http://www.sabah.com.tr/Ekonomi/2014/02/12/yaz-saatinde-onemli-degisiklik
# ... so Turkey will move clocks forward one hour on March 31 at 3:00 a.m.
# From Randal L. Schwartz (2014-04-15):
# Having landed on a flight from the states to Istanbul (via AMS) on March 31,
# I can tell you that NOBODY (even the airlines) respected this timezone DST
# change delay.  Maybe the word just didn't get out in time.
# From Paul Eggert (2014-06-15):
# The press reported massive confusion, as election officials obeyed the rule
# change but cell phones (and airline baggage systems) did not.  See:
# Kostidis M. Eventful elections in Turkey. Balkan News Agency
# http://www.balkaneu.com/eventful-elections-turkey/ 2014-03-30.
# I guess the best we can do is document the official time.

# From Fatih (2015-09-29):
# It's officially announced now by the Ministry of Energy.
# Turkey delays winter time to 8th of November 04:00
# http://www.aa.com.tr/tr/turkiye/yaz-saati-uygulamasi-8-kasimda-sona-erecek/362217
#
# From BBC News (2015-10-25):
# Confused Turks are asking "what's the time?" after automatic clocks defied a
# government decision ... "For the next two weeks #Turkey is on EEST... Erdogan
# Engineered Standard Time," said Twitter user @aysekarahasan.
# http://www.bbc.com/news/world-europe-34631326

# From Burak AYDIN (2016-09-08):
# Turkey will stay in Daylight Saving Time even in winter....
# http://www.resmigazete.gov.tr/eskiler/2016/09/20160908-2.pdf
#
# From Paul Eggert (2016-09-07):
# The change is permanent, so this is the new standard time in Turkey.
# It takes effect today, which is not much notice.

# From Kıvanç Yazan (2017-10-28):
# Turkey will go back to Daylight Saving Time starting 2018-10.
# http://www.resmigazete.gov.tr/eskiler/2017/10/20171028-5.pdf
#
# From Even Scharning (2017-11-08):
# ... today it was announced that the DST will become "continuous":
# http://www.hurriyet.com.tr/son-dakika-yaz-saati-uygulamasi-surekli-hale-geldi-40637482
# From Paul Eggert (2017-11-08):
# Although Google Translate misfires on that source, it looks like
# Turkey reversed last month's decision, and so will stay at +03.

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	Turkey	1916	only	-	May	 1	0:00	1:00	S
Rule	Turkey	1916	only	-	Oct	 1	0:00	0	-
Rule	Turkey	1920	only	-	Mar	28	0:00	1:00	S
Rule	Turkey	1920	only	-	Oct	25	0:00	0	-
Rule	Turkey	1921	only	-	Apr	 3	0:00	1:00	S
Rule	Turkey	1921	only	-	Oct	 3	0:00	0	-
Rule	Turkey	1922	only	-	Mar	26	0:00	1:00	S
Rule	Turkey	1922	only	-	Oct	 8	0:00	0	-
# Whitman gives 1923 Apr 28 - Sep 16 and no DST in 1924-1925;
# go with Shanks & Pottenger.
Rule	Turkey	1924	only	-	May	13	0:00	1:00	S
Rule	Turkey	1924	1925	-	Oct	 1	0:00	0	-
Rule	Turkey	1925	only	-	May	 1	0:00	1:00	S
Rule	Turkey	1940	only	-	Jul	 1	0:00	1:00	S
Rule	Turkey	1940	only	-	Oct	 6	0:00	0	-
Rule	Turkey	1940	only	-	Dec	 1	0:00	1:00	S
Rule	Turkey	1941	only	-	Sep	21	0:00	0	-
Rule	Turkey	1942	only	-	Apr	 1	0:00	1:00	S
Rule	Turkey	1945	only	-	Oct	 8	0:00	0	-
Rule	Turkey	1946	only	-	Jun	 1	0:00	1:00	S
Rule	Turkey	1946	only	-	Oct	 1	0:00	0	-
Rule	Turkey	1947	1948	-	Apr	Sun>=16	0:00	1:00	S
Rule	Turkey	1947	1951	-	Oct	Sun>=2	0:00	0	-
Rule	Turkey	1949	only	-	Apr	10	0:00	1:00	S
Rule	Turkey	1950	only	-	Apr	16	0:00	1:00	S
Rule	Turkey	1951	only	-	Apr	22	0:00	1:00	S
# DST for 15 months; unusual but we'll let it pass.
Rule	Turkey	1962	only	-	Jul	15	0:00	1:00	S
Rule	Turkey	1963	only	-	Oct	30	0:00	0	-
Rule	Turkey	1964	only	-	May	15	0:00	1:00	S
Rule	Turkey	1964	only	-	Oct	 1	0:00	0	-
Rule	Turkey	1973	only	-	Jun	 3	1:00	1:00	S
Rule	Turkey	1973	1976	-	Oct	Sun>=31	2:00	0	-
Rule	Turkey	1974	only	-	Mar	31	2:00	1:00	S
Rule	Turkey	1975	only	-	Mar	22	2:00	1:00	S
Rule	Turkey	1976	only	-	Mar	21	2:00	1:00	S
Rule	Turkey	1977	1978	-	Apr	Sun>=1	2:00	1:00	S
Rule	Turkey	1977	1978	-	Oct	Sun>=15	2:00	0	-
Rule	Turkey	1978	only	-	Jun	29	0:00	0	-
Rule	Turkey	1983	only	-	Jul	31	2:00	1:00	S
Rule	Turkey	1983	only	-	Oct	 2	2:00	0	-
Rule	Turkey	1985	only	-	Apr	20	1:00s	1:00	S
Rule	Turkey	1985	only	-	Sep	28	1:00s	0	-
Rule	Turkey	1986	1993	-	Mar	lastSun	1:00s	1:00	S
Rule	Turkey	1986	1995	-	Sep	lastSun	1:00s	0	-
Rule	Turkey	1994	only	-	Mar	20	1:00s	1:00	S
Rule	Turkey	1995	2006	-	Mar	lastSun	1:00s	1:00	S
Rule	Turkey	1996	2006	-	Oct	lastSun	1:00s	0	-
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Istanbul	1:55:52 -	LMT	1880
			1:56:56	-	IMT	1910 Oct # Istanbul Mean Time?
			2:00	Turkey	EE%sT	1978 Jun 29
			3:00	Turkey	%z	1984 Nov  1  2:00
			2:00	Turkey	EE%sT	2007
			2:00	EU	EE%sT	2011 Mar 27  1:00u
			2:00	-	EET	2011 Mar 28  1:00u
			2:00	EU	EE%sT	2014 Mar 30  1:00u
			2:00	-	EET	2014 Mar 31  1:00u
			2:00	EU	EE%sT	2015 Oct 25  1:00u
			2:00	1:00	EEST	2015 Nov  8  1:00u
			2:00	EU	EE%sT	2016 Sep  7
			3:00	-	%z

# Ukraine
#
# From Alois Treindl (2014-03-01):
# REGULATION A N O V A on March 20, 1992 N 139 ...  means that from
# 1992 on, Ukraine had DST with begin time at 02:00 am, on last Sunday
# in March, and end time 03:00 am, last Sunday in September....
# CABINET OF MINISTERS OF UKRAINE RESOLUTION on May 13, 1996 N 509
# "On the order of computation time on the territory of Ukraine" ....
# As this cabinet decision is from May 1996, it seems likely that the
# transition in March 1996, which predates it, was still at 2:00 am
# and not at 3:00 as would have been under EU rules.
# This is why I have set the change to EU rules into May 1996,
# so that the change in March is stil covered by the Ukraine rule.
# The next change in October 1996 happened under EU rules.
#
# From Paul Eggert (2022-08-27):
# For now, assume that Ukraine's zones all followed the same rules,
# except that Crimea switched to Moscow time in 1994 as described elsewhere.

# From Igor Karpov, who works for the Ukrainian Ministry of Justice,
# via Garrett Wollman (2003-01-27):
# BTW, I've found the official document on this matter. It's government
# regulations No. 509, May 13, 1996. In my poor translation it says:
# "Time in Ukraine is set to second timezone (Kiev time). Each last Sunday
# of March at 3am the time is changing to 4am and each last Sunday of
# October the time at 4am is changing to 3am"

# From Alexander Krivenyshev (2011-09-20):
# On September 20, 2011 the deputies of the Verkhovna Rada agreed to
# abolish the transfer clock to winter time.
#
# Bill No. 8330 of MP from the Party of Regions Oleg Nadoshi got
# approval from 266 deputies.
#
# Ukraine abolishes transfer back to the winter time (in Russian)
# http://news.mail.ru/politics/6861560/
#
# The Ukrainians will no longer change the clock (in Russian)
# http://www.segodnya.ua/news/14290482.html
#
# Deputies cancelled the winter time (in Russian)
# https://www.pravda.com.ua/rus/news/2011/09/20/6600616/
#
# From Philip Pizzey (2011-10-18):
# Today my Ukrainian colleagues have informed me that the
# Ukrainian parliament have decided that they will go to winter
# time this year after all.
#
# From Udo Schwedt (2011-10-18):
# As far as I understand, the recent change to the Ukrainian time zone
# (Europe/Kiev) to introduce permanent daylight saving time (similar
# to Russia) was reverted today:
# http://portal.rada.gov.ua/rada/control/en/publish/article/info_left?art_id=287324&cat_id=105995
#
# Also reported by Alexander Bokovoy (2011-10-18) who also noted:
# The law documents themselves are at
# http://w1.c1.rada.gov.ua/pls/zweb_n/webproc4_1?id=&pf3511=41484

# From Vladimir in Moscow via Alois Treindl re Kyiv time 1991/2 (2014-02-28):
# First in Ukraine they changed Time zone from UTC+3 to UTC+2 with DST:
#       03 25 1990 02:00 -03.00 1       Time Zone 3 with DST
#       07 01 1990 02:00 -02.00 1       Time Zone 2 with DST
# * Ukrainian Government's Resolution of 18.06.1990, No. 134.
# http://search.ligazakon.ua/l_doc2.nsf/link1/T001500.html
#
# They did not end DST in September, 1990 (according to the law,
# "summer time" was still in action):
#       09 30 1990 03:00 -02.00 1       Time Zone 2 with DST
# * Ukrainian Government's Resolution of 21.09.1990, No. 272.
# http://search.ligazakon.ua/l_doc2.nsf/link1/KP900272.html
#
# Again no change in March, 1991 ("summer time" in action):
#       03 31 1991 02:00 -02.00 1       Time Zone 2 with DST
#
# DST ended in September 1991 ("summer time" ended):
#       09 29 1991 03:00 -02.00 0       Time Zone 2, no DST
# * Ukrainian Government's Resolution of 25.09.1991, No. 225.
# http://www.uazakon.com/documents/date_21/pg_iwgdoc.htm
# This is an answer.
#
# Since 1992 they had normal DST procedure:
#       03 29 1992 02:00 -02.00 1       DST started
#       09 27 1992 03:00 -02.00 0       DST ended
# * Ukrainian Government's Resolution of 20.03.1992, No. 139.
# http://www.uazakon.com/documents/date_8u/pg_grcasa.htm

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone Europe/Kyiv	2:02:04 -	LMT	1880
			2:02:04	-	KMT	1924 May  2 # Kyiv Mean Time
			2:00	-	EET	1930 Jun 21
			3:00	-	MSK	1941 Sep 20
			1:00	C-Eur	CE%sT	1943 Nov  6
			3:00	Russia	MSK/MSD	1990 Jul  1  2:00
			2:00	1:00	EEST	1991 Sep 29  3:00
			2:00	C-Eur	EE%sT	1996 May 13
			2:00	EU	EE%sT

###############################################################################

# One source shows that Bulgaria, Cyprus, Finland, and Greece observe DST from
# the last Sunday in March to the last Sunday in September in 1986.
# The source shows Romania changing a day later than everybody else.
#
# According to Bernard Sieloff's source, Poland is in the MET time zone but
# uses the WE DST rules.  The Western USSR uses EET+1 and ME DST rules.
# Bernard Sieloff's source claims Romania switches on the same day, but at
# 00:00 standard time (i.e., 01:00 DST).  It also claims that Turkey
# switches on the same day, but switches on at 01:00 standard time
# and off at 00:00 standard time (i.e., 01:00 DST)

# ...
# Date: Wed, 28 Jan 87 16:56:27 -0100
# From: Tom Hofmann
# ...
#
# ...the European time rules are...standardized since 1981, when
# most European countries started DST.  Before that year, only
# a few countries (UK, France, Italy) had DST, each according
# to own national rules.  In 1981, however, DST started on
# 'Apr firstSun', and not on 'Mar lastSun' as in the following
# years...
# But also since 1981 there are some more national exceptions
# than listed in 'europe': Switzerland, for example, joined DST
# one year later, Denmark ended DST on 'Oct 1' instead of 'Sep
# lastSun' in 1981 - I don't know how they handle now.
#
# Finally, DST ist always from 'Apr 1' to 'Oct 1' in the
# Soviet Union (as far as I know).
#
# Tom Hofmann, Scientific Computer Center, CIBA-GEIGY AG,
# 4002 Basle, Switzerland
# ...

# ...
# Date: Wed, 4 Feb 87 22:35:22 +0100
# From: Dik T. Winter
# ...
#
# The information from Tom Hofmann is (as far as I know) not entirely correct.
# After a request from chongo at amdahl I tried to retrieve all information
# about DST in Europe.  I was able to find all from about 1969.
#
# ...standardization on DST in Europe started in about 1977 with switches on
# first Sunday in April and last Sunday in September...
# In 1981 UK joined Europe insofar that
# the starting day for both shifted to last Sunday in March.  And from 1982
# the whole of Europe used DST, with switch dates April 1 and October 1 in
# the Sov[i]et Union.  In 1985 the SU reverted to standard Europe[a]n switch
# dates...
#
# It should also be remembered that time-zones are not constants; e.g.
# Portugal switched in 1976 from MET (or CET) to WET with DST...
# Note also that though there were rules for switch dates not
# all countries abided to these dates, and many individual deviations
# occurred, though not since 1982 I believe.  Another note: it is always
# assumed that DST is 1 hour ahead of normal time, this need not be the
# case; at least in the Netherlands there have been times when DST was 2 hours
# in advance of normal time.
#
# ...
# dik t. winter, cwi, amsterdam, nederland
# ...

# From Bob Devine (1988-01-28):
# ...
# Greece: Last Sunday in April to last Sunday in September (iffy on dates).
# Since 1978.  Change at midnight.
# ...
# Monaco: has same DST as France.
# ...
