[factor.git] / extra / zoneinfo / backzone

# Zones that go back beyond the scope of the tz database

# This file is in the public domain.

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

# When proposing changes to this file, please use 'git format-patch'
# format, either by attaching the resulting .patch file to your email,
# or by using 'git send-email'.  This will help maintainers save time.


# From Paul Eggert (2014-10-31):

# This file contains data outside the normal scope of the tz database,
# in that its zones do not differ from normal tz zones after 1970.
# Links in this file point to zones in this file, superseding links in
# the file 'backward'.

# Although zones in this file may be of some use for analyzing
# pre-1970 timestamps, they are less reliable, cover only a tiny
# sliver of the pre-1970 era, and cannot feasibly be improved to cover
# most of the era.  Because the zones are out of normal scope for the
# database, less effort is put into maintaining this file.  Many of
# the zones were formerly in other source files, but were removed or
# replaced by links as their data entries were questionable and/or they
# differed from other zones only in pre-1970 timestamps.

# 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.

# This file is not intended to be compiled standalone, as it
# assumes rules from other files.  In the tz distribution, use
# 'make PACKRATDATA=backzone zones' to compile and install this file.


# From Paul Eggert (2020-04-15):
# The following remarks should be incorporated into this table sometime.
# Patches in 'git format-patch' format would be welcome.
#
# From Phake Nick (2020-04-15):
# ... the historical timezone data for those China zones seems to be
# incorrect.  The transition to GMT+8 date given there for these zones
# were 1980 which also contradict the file description that they do
# not disagree with normal zone after 1970.  According to sources that
# have also been cited in the asia file, except Xinjiang and Tibet,
# they should have adopted the Beijing Time from around 1949/1950
# depends on exactly when each of those cities were taken over by the
# communist army.  And they should also follow the DST setting of
# Asia/Shanghai after that point of time.  In addition,
# http://gaz.ncl.edu.tw/detail.jsp?sysid=E1091792 the document from
# Chongqing Nationalist government say in year 1945 all of China
# should adopt summer time due to the war (not sure whether it
# continued after WWII ends)(Probably only enforced in area under
# their rule at the time?)  The Asia/Harbin's 1932 and 1940 entry
# should also be incorrect.  As per sources recorded at
# https://wiki.suikawiki.org/n/%E6%BA%80%E5%B7%9E%E5%9B%BD%E3%81%AE%E6%A8%99%E6%BA%96%E6%99%82
# , in 1932 Harbin should have adopted UTC+8:00 instead of data
# currently listed in the tz database according to official
# announcement from Manchuko.  And they should have adopted GMT+9 in
# 1937 January 1st according to official announcement at the time
# being cited on the webpage.


# Zones are sorted by zone name.  Each zone is preceded by the
# name of the country that the zone is in, along with any other
# commentary and rules associated with the entry.
# If the zone overrides links in the main data, it
# is followed by the corresponding Link lines.
# If the zone overrides main-data links only when building with
# PACKRATLIST=zone.tab, it is followed by a commented-out Link line
# that starts with "#PACKRATLIST zone.tab".
#
# As explained in the zic man page, the zone columns are:
# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
# and the rule columns are:
# Rule  NAME    FROM    TO      -       IN      ON      AT      SAVE    LETTER/S


# Ghana

# From P Chan (2020-11-20):
# Interpretation Amendment Ordinance, 1915 (No.24 of 1915) [1915-11-02]
# Ordinances of the Gold Coast, Ashanti, Northern Territories 1915, p 69-71
# https://books.google.com/books?id=ErA-AQAAIAAJ&pg=PA70
# This Ordinance added "'Time' shall mean Greenwich Mean Time" to the
# Interpretation Ordinance, 1876.
#
# Determination of the Time Ordinance, 1919 (No. 18 of 1919) [1919-11-24]
# Ordinances of the Gold Coast, Ashanti, Northern Territories 1919, p 75-76
# https://books.google.com/books?id=MbA-AQAAIAAJ&pg=PA75
# This Ordinance removed the previous definition of time and introduced DST.
#
# Time Determination Ordinance (Cap. 214)
# The Laws of the Gold Coast (including Togoland Under British Mandate)
# Vol. II (1937), p 2328
# https://books.google.com/books?id=Z7M-AQAAIAAJ&pg=PA2328
# Revised edition of the 1919 Ordinance.
#
# Time Determination (Amendment) Ordinance, 1940 (No. 9 of 1940) [1940-04-06]
# Annual Volume of the Laws of the Gold Coast:
# Containing All Legislation Enacted During Year 1940, p 22
# https://books.google.com/books?id=1ao-AQAAIAAJ&pg=PA22
# This Ordinance changed the forward transition from September to May.
#
# Defence (Time Determination Ordinance Amendment) Regulations, 1942
# (Regulations No. 6 of 1942) [1942-01-31, commenced on 1942-02-08]
# Annual Volume of the Laws of the Gold Coast:
# Containing All Legislation Enacted During Year 1942, p 48
# https://books.google.com/books?id=Das-AQAAIAAJ&pg=PA48
# These regulations advanced the [standard] time by thirty minutes.
#
# Defence (Time Determination Ordinance Amendment (No.2)) Regulations,
# 1942 (Regulations No. 28 of 1942) [1942-04-25]
# Annual Volume of the Laws of the Gold Coast:
# Containing All Legislation Enacted During Year 1942, p 87
# https://books.google.com/books?id=Das-AQAAIAAJ&pg=PA87
# These regulations abolished DST and changed the time to GMT+0:30.
#
# Defence (Revocation) (No.4) Regulations, 1945 (Regulations No. 45 of
# 1945) [1945-10-24, commenced on 1946-01-06]
# Annual Volume of the Laws of the Gold Coast:
# Containing All Legislation Enacted During Year 1945, p 256
# https://books.google.com/books?id=9as-AQAAIAAJ&pg=PA256
# These regulations revoked the previous two sets of Regulations.
#
# Time Determination (Amendment) Ordinance, 1945 (No. 18 of 1945) [1946-01-06]
# Annual Volume of the Laws of the Gold Coast:
# Containing All Legislation Enacted During Year 1945, p 69
# https://books.google.com/books?id=9as-AQAAIAAJ&pg=PA69
# This Ordinance abolished DST.
#
# Time Determination (Amendment) Ordinance, 1950 (No. 26 of 1950) [1950-07-22]
# Annual Volume of the Laws of the Gold Coast:
# Containing All Legislation Enacted During Year 1950, p 35
# https://books.google.com/books?id=e60-AQAAIAAJ&pg=PA35
# This Ordinance restored DST but with thirty minutes offset.
#
# Time Determination Ordinance (Cap. 264)
# The Laws of the Gold Coast, Vol. V (1954), p 380
# https://books.google.com/books?id=Mqc-AQAAIAAJ&pg=PA380
# Revised edition of the Time Determination Ordinance.
#
# Time Determination (Amendment) Ordinance, 1956 (No. 21 of 1956) [1956-08-29]
# Annual Volume of the Ordinances of the Gold Coast Enacted During the
# Year 1956, p 83
# https://books.google.com/books?id=VLE-AQAAIAAJ&pg=PA83
# This Ordinance abolished DST.

Rule    Ghana   1919    only    -       Nov     24      0:00    0:20    +0020
Rule    Ghana   1920    1942    -       Jan      1      2:00    0       GMT
Rule    Ghana   1920    1939    -       Sep      1      2:00    0:20    +0020
Rule    Ghana   1940    1941    -       May      1      2:00    0:20    +0020
Rule    Ghana   1950    1955    -       Sep      1      2:00    0:30    +0030
Rule    Ghana   1951    1956    -       Jan      1      2:00    0       GMT

Zone    Africa/Accra    -0:00:52 -      LMT     1915 Nov  2
                         0:00   Ghana   %s      1942 Feb  8
                         0:30   -       +0030   1946 Jan  6
                         0:00   Ghana   %s

# Ethiopia
# From Paul Eggert (2014-07-31):
# Like the Swahili of Kenya and Tanzania, many Ethiopians keep a
# 12-hour clock starting at our 06:00, so their "8 o'clock" is our
# 02:00 or 14:00.  Keep this in mind when you ask the time in Amharic.
#
# Shanks & Pottenger write that Ethiopia had six narrowly spaced time
# zones between 1870 and 1890, that they merged to 38E50 (2:35:20) in
# 1890, and that they switched to 3:00 on 1936-05-05.  Perhaps 38E50
# was for Adis Dera.  Quite likely the Shanks data entries are wrong
# anyway.
Zone Africa/Addis_Ababa 2:34:48 -       LMT     1870
                        2:35:20 -       ADMT    1936 May  5 # Adis Dera MT
                        3:00    -       EAT

# Eritrea
Zone    Africa/Asmara   2:35:32 -       LMT     1870
                        2:35:32 -       AMT     1890        # Asmara Mean Time
                        2:35:20 -       ADMT    1936 May  5 # Adis Dera MT
                        3:00    -       EAT
Link Africa/Asmara Africa/Asmera

# Mali (southern)
Zone    Africa/Bamako   -0:32:00 -      LMT     1912
                         0:00   -       GMT     1934 Feb 26
                        -1:00   -       -01     1960 Jun 20
                         0:00   -       GMT
#PACKRATLIST zone.tab Link Africa/Bamako Africa/Timbuktu

# Central African Republic
Zone    Africa/Bangui   1:14:20 -       LMT     1912
                        1:00    -       WAT

# The Gambia
# From P Chan (2020-12-09):
# Standard time of GMT-1 was adopted on 1933-04-01.  On 1942-02-01, GMT was
# adopted as a war time measure.  This was made permanent in 1946.
#
# Interpretation Ordinance, 1914 (No. 12 of 1914) [1914-09-29]
# Interpretation Ordinance, 1933 (No. 10 of 1933) [1933-03-31]
# Notice No. 5 of 1942, Colony of the Gambia Government Gazette, Vol. LIX,
# No.2, 1942-01-15, p 2
# Interpretation (Amendment) Ordinance, 1946 (No. 3 of 1946) [1946-07-15]
Zone    Africa/Banjul   -1:06:36 -      LMT     1912
                        -1:06:36 -      BMT     1933 Apr  1 # Banjul Mean Time
                        -1:00   -       -01     1942 Feb  1  0:00
                         0:00   -       GMT

# Malawi
# From P Chan (2020-12-09):
# In 1911, Zomba mean time was adopted as the legal time of Nyasaland.  In
# 1914, Zomba mean time switched from GMT+2:21:10 to GMT+2:21. On 1925-07-01,
# GMT+2 was adopted.
#
# Interpretation and General Clauses Ordinance, 1911 (No. 12 of 1911)
# [1911-07-24]
# Notice No. 124 of 1914, 1914-06-30, The Nyasaland Government Gazette, Vol.
# XXI, No. 8, 1914-06-30, p 122
# Interpretation and General Clauses (Amendment) Ordinance, 1925 (No. 3 of
# 1925) [1925-04-02]
Zone    Africa/Blantyre 2:20:00 -       LMT     1911 Jul 24
                        2:21:10 -       ZMT     1914 Jun 30 # Zomba Mean Time
                        2:21    -       ZMT     1925 Jul  1
                        2:00    -       CAT

# Republic of the Congo
Zone Africa/Brazzaville 1:01:08 -       LMT     1912
                        1:00    -       WAT

# Burundi
Zone Africa/Bujumbura   1:57:28 -       LMT     1890
                        2:00    -       CAT

# Guinea
Zone    Africa/Conakry  -0:54:52 -      LMT     1912
                         0:00   -       GMT     1934 Feb 26
                        -1:00   -       -01     1960
                         0:00   -       GMT

# Senegal
Zone    Africa/Dakar    -1:09:44 -      LMT     1912
                        -1:00   -       -01     1941 Jun
                         0:00   -       GMT

# Tanzania
Zone Africa/Dar_es_Salaam 2:37:08 -     LMT     1931
                        3:00    -       EAT     1948
                        2:45    -       +0245   1961
                        3:00    -       EAT

# Djibouti
Zone    Africa/Djibouti 2:52:36 -       LMT     1911 Jul
                        3:00    -       EAT

# Cameroon
# Whitman says they switched to 1:00 in 1920; go with Shanks & Pottenger.
Zone    Africa/Douala   0:38:48 -       LMT     1912
                        1:00    -       WAT
# Sierra Leone
# From P Chan (2020-12-09):
# Standard time of GMT-1 was adopted on 1913-07-01.  Twenty minutes of DST was
# introduce[d] in 1932 and was suspended in 1939.  In 1941, GMT was adopted by
# Defence Regulations.  This was made permanent in 1946.
#
# Government Notice No. 121 of 1913, 1913-06-06, Sierra Leone Royal Gazette,
# Vol. XLIV, No. 1384, 1913-06-14, p 347
# Alteration of Time Ordinance, 1932 (No. 34 of 1932) [1932-12-01]
# Alteration of Time (Amendment) Ordinance, 1938 (No. 25 of 1938) [1938-11-24]
# Defence Regulations (No. 9), 1939 (Regulations No. 9 of 1939), 1939-09-05
# Defence Regulations (No. 11), 1939 (Regulations No. 11 of 1939), 1939-09-27
# Defence (Amendment) (No. 17) Regulations, 1941 (Public Notice No. 157 of
# 1941), 1914-12-04
# Alteration of Time (Amendment) Ordinance, 1946 (No. 2 of 1946) [1946-02-07]

# From Tim Parenti (2021-03-02), per P Chan (2021-02-25):
# For Sierra Leone in 1957-1962, the standard time was defined in the
# Alteration of Time Ordinance, 1932 (as amended in 1946, renamed to Local Time
# Ordinance in 1960 and Local Time Act in 1961). It was unamended throughout
# that period.  See references to "Time" in the Alphabetical Index of the
# Legislation in force on the 31st day of December,
#   1957: https://books.google.com/books?id=lvQ-AQAAIAAJ&pg=RA2-PA49
#   1958: https://books.google.com/books?id=4fQ-AQAAIAAJ&pg=RA2-PA50
#   1959: https://books.google.com/books?id=p_U-AQAAIAAJ&pg=RA2-PA55
#   1960: https://books.google.com/books?id=JPY-AQAAIAAJ&pg=RA3-PA37
#   1961: https://books.google.com/books?id=7vY-AQAAIAAJ&pg=RA3-PA41
#   1962: https://books.google.com/books?id=W_c-AQAAIAAJ&pg=RA3-PA44
#   1963: https://books.google.com/books?id=9vk-AQAAIAAJ&pg=RA1-PA47
#
# Although Shanks & Pottenger had DST from Jun 1 00:00 to Sep 1 00:00 in this
# period, many contemporaneous almanacs agree that it wasn't used:
# https://mm.icann.org/pipermail/tz/2021-February/029866.html
# Go with the above.

Rule    SL      1932    only    -       Dec      1       0:00   0:20    -0040
Rule    SL      1933    1938    -       Mar     31      24:00   0       -01
Rule    SL      1933    1939    -       Aug     31      24:00   0:20    -0040
Rule    SL      1939    only    -       May     31      24:00   0       -01

Zone    Africa/Freetown -0:53:00 -      LMT     1882
                        -0:53:00 -      FMT     1913 Jul  1 # Freetown MT
                        -1:00   SL      %s      1939 Sep  5
                        -1:00   -       -01     1941 Dec  6 24:00
                         0:00   -       GMT

# Botswana
# From Paul Eggert (2013-02-21):
# Milne says they were regulated by the Cape Town Signal in 1899;
# assume they switched to 2:00 when Cape Town did.
Zone    Africa/Gaborone 1:43:40 -       LMT     1885
                        1:30    -       SAST    1903 Mar
                        2:00    -       CAT     1943 Sep 19  2:00
                        2:00    1:00    CAST    1944 Mar 19  2:00
                        2:00    -       CAT

# Zimbabwe
Zone    Africa/Harare   2:04:12 -       LMT     1903 Mar
                        2:00    -       CAT

# Uganda
Zone    Africa/Kampala  2:09:40 -       LMT     1928 Jul
                        3:00    -       EAT     1930
                        2:30    -       +0230   1948
                        2:45    -       +0245   1957
                        3:00    -       EAT

# Rwanda
Zone    Africa/Kigali   2:00:16 -       LMT     1935 Jun
                        2:00    -       CAT

# Democratic Republic of the Congo (west)
Zone Africa/Kinshasa    1:01:12 -       LMT     1897 Nov  9
                        1:00    -       WAT

# Gabon
Zone Africa/Libreville  0:37:48 -       LMT     1912
                        1:00    -       WAT

# Togo
Zone    Africa/Lome     0:04:52 -       LMT     1893
                        0:00    -       GMT

# Angola
#
# From Paul Eggert (2018-02-16):
# Shanks gives 1911-05-26 for the transition to WAT,
# evidently confusing the date of the Portuguese decree
# (see Europe/Lisbon) with the date that it took effect.
#
Zone    Africa/Luanda   0:52:56 -       LMT     1892
                        0:52:04 -       LMT     1911 Dec 31 23:00u # Luanda MT?
                        1:00    -       WAT

# Democratic Republic of the Congo (east)
#
# From Alois Treindl (2022-02-28):
# My main source for its time zone history is
# Henri le Corre, Régimes horaires pour l'Europe et l'Afrique.
# Shanks follows le Corre.  As does Françoise Schneider-Gauquelin in her book
# Problèmes de l'heure résolus pour le monde entier.
#
Zone Africa/Lubumbashi  1:49:52 -       LMT     1897 Nov  9
                        1:00    -       WAT     1920 Apr 25
                        2:00    -       CAT

# Zambia
Zone    Africa/Lusaka   1:53:08 -       LMT     1903 Mar
                        2:00    -       CAT

# Equatorial Guinea
#
# Although Shanks says that Malabo switched from UT +00 to +01 on 1963-12-15,
# a Google Books search says that London Calling, Issues 432-465 (1948), p 19,
# says that Spanish Guinea was at +01 back then.  The Shanks data entries
# are most likely wrong, but we have nothing better; use them here for now.
#
Zone    Africa/Malabo   0:35:08 -       LMT     1912
                        0:00    -       GMT     1963 Dec 15
                        1:00    -       WAT

# Lesotho
Zone    Africa/Maseru   1:50:00 -       LMT     1903 Mar
                        2:00    -       SAST    1943 Sep 19  2:00
                        2:00    1:00    SAST    1944 Mar 19  2:00
                        2:00    -       SAST

# Eswatini (formerly Swaziland)
Zone    Africa/Mbabane  2:04:24 -       LMT     1903 Mar
                        2:00    -       SAST

# Somalia
Zone Africa/Mogadishu   3:01:28 -       LMT     1893 Nov
                        3:00    -       EAT     1931
                        2:30    -       +0230   1957
                        3:00    -       EAT

# Niger
Zone    Africa/Niamey    0:08:28 -      LMT     1912
                        -1:00   -       -01     1934 Feb 26
                         0:00   -       GMT     1960
                         1:00   -       WAT

# Mauritania
Zone Africa/Nouakchott  -1:03:48 -      LMT     1912
                         0:00   -       GMT     1934 Feb 26
                        -1:00   -       -01     1960 Nov 28
                         0:00   -       GMT

# Burkina Faso
Zone Africa/Ouagadougou -0:06:04 -      LMT     1912
                         0:00   -       GMT

# Benin
# Whitman says they switched to 1:00 in 1946, not 1934;
# go with Shanks & Pottenger.
Zone Africa/Porto-Novo  0:10:28 -       LMT     1912 Jan  1
                        0:00    -       GMT     1934 Feb 26
                        1:00    -       WAT

# Mali (northern)
Zone    Africa/Timbuktu -0:12:04 -      LMT     1912
                         0:00   -       GMT

# Anguilla
Zone America/Anguilla   -4:12:16 -      LMT     1912 Mar  2
                        -4:00   -       AST

# Antigua and Barbuda
Zone    America/Antigua -4:07:12 -      LMT     1912 Mar 2
                        -5:00   -       EST     1951
                        -4:00   -       AST

# Chubut, Argentina
# The name "Comodoro Rivadavia" exceeds the 14-byte POSIX limit.
Zone America/Argentina/ComodRivadavia -4:30:00 - LMT    1894 Oct 31
                        -4:16:48 -      CMT     1920 May
                        -4:00   -       -04     1930 Dec
                        -4:00   Arg     -04/-03 1969 Oct  5
                        -3:00   Arg     -03/-02 1991 Mar  3
                        -4:00   -       -04     1991 Oct 20
                        -3:00   Arg     -03/-02 1999 Oct  3
                        -4:00   Arg     -04/-03 2000 Mar  3
                        -3:00   -       -03     2004 Jun  1
                        -4:00   -       -04     2004 Jun 20
                        -3:00   -       -03

# Aruba
Zone    America/Aruba   -4:40:24 -      LMT     1912 Feb 12 # Oranjestad
                        -4:30   -       -0430   1965
                        -4:00   -       AST

# Atikokan, Ontario

# From Paul Eggert (1997-10-17):
# Mark Brader writes that an article in the 1997-10-14 Toronto Star
# says that Atikokan, Ontario currently does not observe DST,
# but will vote on 11-10 whether to use EST/EDT.
# He also writes that the Ontario Time Act (1990, Chapter T.9)
# http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
# Officially Atikokan is therefore on CST/CDT, and most likely this report
# concerns a non-official time observed as a matter of local practice.
#
# From Paul Eggert (2000-10-02):
# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
# New Osnaburgh observe CST all year, that Big Trout Lake observes
# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
# violation of the official Ontario rules.
#
# From Paul Eggert (2006-07-09):
# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
# 2005-07-21 Chronicle-Journal, which said:
#
#       The clocks in Atikokan stay set on standard time year-round.
#       This means they spend about half the time on central time and
#       the other half on eastern time.
#
#       For the most part, the system works, Mayor Dennis Brown said.
#
#       "The majority of businesses in Atikokan deal more with Eastern
#       Canada, but there are some that deal with Western Canada," he
#       said.  "I don't see any changes happening here."
#
# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
# [New Osnaburgh] follow the same practice."

# From Garry McKinnon (2006-07-14) via Chris Walton:
# I chatted with a member of my board who has an outstanding memory
# and a long history in Atikokan (and in the telecom industry) and he
# can say for certain that Atikokan has been practicing the current
# time keeping since 1952, at least.

# From Paul Eggert (2006-07-17):
# Shanks & Pottenger say that Atikokan has agreed with Rainy River
# ever since standard time was introduced, but the information from
# McKinnon sounds more authoritative.  For now, assume that Atikokan
# switched to EST immediately after WWII era daylight saving time
# ended.  This matches the old (less populous) America/Coral_Harbour
# entry since our cutoff date of 1970, so we can move
# America/Coral_Harbour to the 'backward' file.

Zone America/Atikokan   -6:06:28 -      LMT     1895
                        -6:00   Canada  C%sT    1940 Sep 29
                        -6:00   1:00    CDT     1942 Feb  9  2:00s
                        -6:00   Canada  C%sT    1945 Sep 30  2:00
                        -5:00   -       EST
#PACKRATLIST zone.tab Link America/Atikokan America/Coral_Harbour

# Quebec east of Natashquan

# From Paul Eggert (2021-05-09):
# H. David Matthews and Mary Vincent's map
# "It's about TIME", _Canadian Geographic_ (September-October 1998)
# http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
# says that Quebec east of the -63 meridian is supposed to observe
# AST, but residents as far east as Natashquan use EST/EDT, and
# residents east of Natashquan use AST.
# The Quebec department of justice writes in
# "The situation in Minganie and Basse-Côte-Nord"
# https://www.justice.gouv.qc.ca/en/department/ministre/functions-and-responsabilities/legal-time-in-quebec/the-situation-in-minganie-and-basse-cote-nord/
# that the coastal strip from just east of Natashquan to Blanc-Sablon
# observes Atlantic standard time all year round.
# This common practice was codified into law as of 2007; see Legal Time Act,
# CQLR c T-5.1 <http://legisquebec.gouv.qc.ca/en/ShowDoc/cs/T-5.1>.
# For lack of better info, guess this practice began around 1970, contra to
# Shanks & Pottenger who have this region observing AST/ADT.

Zone America/Blanc-Sablon -3:48:28 -    LMT     1884
                        -4:00   Canada  A%sT    1970
                        -4:00   -       AST

# Cayman Is
Zone    America/Cayman  -5:25:32 -      LMT     1890     # Georgetown
                        -5:07:10 -      KMT     1912 Feb # Kingston Mean Time
                        -5:00   -       EST

# United States
#
# From Paul Eggert (2018-03-18):
# America/Chillicothe would be tricky, as it was a city of two-timers:
# "To prevent a constant mixup at Chillicothe, caused by the courthouse
#  clock running on central time and the city running on 'daylight saving'
#  time, a third hand was added to the dial of the courthouse clock."
# -- Ohio news in brief. The Cedarville Herald. 1920-05-21;43(21):1 (col. 5)
# https://digitalcommons.cedarville.edu/cedarville_herald/794

# Canada
Zone America/Coral_Harbour -5:32:40 -   LMT     1884
                        -5:00   NT_YK   E%sT    1946
                        -5:00   -       EST

# From Chris Walton (2011-12-01):
# There are two areas within the Canadian province of British Columbia
# that do not currently observe daylight saving:
# a) The Creston Valley (includes the town of Creston and surrounding area)
# b) The eastern half of the Peace River Regional District
# (includes the cities of Dawson Creek and Fort St. John)

# Earlier this year I stumbled across a detailed article about the time
# keeping history of Creston; it was written by Tammy Hardwick who is the
# manager of the Creston & District Museum. The article was written in May 2009.
# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
# According to the article, Creston has not changed its clocks since June 1918.
# i.e. Creston has been stuck on UT-7 for 93 years.
# Dawson Creek, on the other hand, changed its clocks as recently as April 1972.

# Unfortunately the exact date for the time change in June 1918 remains
# unknown and will be difficult to ascertain.  I e-mailed Tammy a few months
# ago to ask if Sunday June 2 was a reasonable guess.  She said it was just
# as plausible as any other date (in June).  She also said that after writing
# the article she had discovered another time change in 1916; this is the
# subject of another article which she wrote in October 2010.
# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56

# Here is a summary of the three clock change events in Creston's history:
# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
# Exact date unknown
# 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
# Exact date in October unknown; Sunday October 1 is a reasonable guess.
# 3. June 1918: switch to Pacific Daylight Time (GMT-7)
# Exact date in June unknown; Sunday June 2 is a reasonable guess.
# note 1:
# On Oct 27/1918 when daylight saving ended in the rest of Canada,
# Creston did not change its clocks.
# note 2:
# During WWII when the Federal Government legislated a mandatory clock change,
# Creston did not oblige.
# note 3:
# There is no guarantee that Creston will remain on Mountain Standard Time
# (UTC-7) forever.
# The subject was debated at least once this year by the town Council.
# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html

# During a period WWII, summer time (Daylight saying) was mandatory in Canada.
# In Creston, that was handled by shifting the area to PST (-8:00) then applying
# summer time to cause the offset to be -7:00, the same as it had been before
# the change.  It can be argued that the timezone abbreviation during this
# period should be PDT rather than MST, but that doesn't seem important enough
# (to anyone) to further complicate the rules.

# The transition dates (and times) are guesses.

Zone America/Creston    -7:46:04 -      LMT     1884
                        -7:00   -       MST     1916 Oct 1
                        -8:00   -       PST     1918 Jun 2
                        -7:00   -       MST

# Curaçao
# Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
#
# From Paul Eggert (2006-03-22):
# Shanks & Pottenger say that The Bottom and Philipsburg have been at
# -4:00 since standard time was introduced on 1912-03-02; and that
# Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
# 1912-02-02 to 1965-01-01.  The former is dubious, since S&P also say
# Saba Island has been like Curaçao.
# This all predates our 1970 cutoff, though.
#
# By July 2007 Curaçao and St Maarten are planned to become
# associated states within the Netherlands, much like Aruba;
# Bonaire, Saba and St Eustatius would become directly part of the
# Netherlands as Kingdom Islands.  This won't affect their time zones
# though, as far as we know.
#
Zone    America/Curacao -4:35:47 -      LMT     1912 Feb 12 # Willemstad
                        -4:30   -       -0430   1965
                        -4:00   -       AST
Link    America/Curacao America/Kralendijk
Link    America/Curacao America/Lower_Princes

# Dominica
Zone America/Dominica   -4:05:36 -      LMT     1911 Jul  1  0:01 # Roseau
                        -4:00   -       AST

# Baja California
# See 'northamerica' for why this entry is here rather than there.
Zone America/Ensenada   -7:46:28 -      LMT     1922 Jan  1  0:13:32
                        -8:00   -       PST     1927 Jun 10 23:00
                        -7:00   -       MST     1930 Nov 16
                        -8:00   -       PST     1942 Apr
                        -7:00   -       MST     1949 Jan 14
                        -8:00   -       PST     1996
                        -8:00   Mexico  P%sT

# Grenada
Zone    America/Grenada -4:07:00 -      LMT     1911 Jul # St George's
                        -4:00   -       AST

# Guadeloupe
Zone America/Guadeloupe -4:06:08 -      LMT     1911 Jun  8 # Pointe-à-Pitre
                        -4:00    -      AST


# Canada
#
# From Paul Eggert (2015-03-24):
# Since 1970 most of Quebec has been like Toronto; see
# America/Toronto.  However, earlier versions of the tz database
# mistakenly relied on data from Shanks & Pottenger saying that Quebec
# differed from Ontario after 1970, and the following rules and zone
# were created for most of Quebec from the incorrect Shanks &
# Pottenger data.  The post-1970 entries have been corrected, but the
# pre-1970 entries are unchecked and probably have errors.
#
Rule    Mont    1917    only    -       Mar     25      2:00    1:00    D
Rule    Mont    1917    only    -       Apr     24      0:00    0       S
Rule    Mont    1919    only    -       Mar     31      2:30    1:00    D
Rule    Mont    1919    only    -       Oct     25      2:30    0       S
Rule    Mont    1920    only    -       May      2      2:30    1:00    D
Rule    Mont    1920    1922    -       Oct     Sun>=1  2:30    0       S
Rule    Mont    1921    only    -       May      1      2:00    1:00    D
Rule    Mont    1922    only    -       Apr     30      2:00    1:00    D
Rule    Mont    1924    only    -       May     17      2:00    1:00    D
Rule    Mont    1924    1926    -       Sep     lastSun 2:30    0       S
Rule    Mont    1925    1926    -       May     Sun>=1  2:00    1:00    D
Rule    Mont    1927    1937    -       Apr     lastSat 24:00   1:00    D
Rule    Mont    1927    1937    -       Sep     lastSat 24:00   0       S
Rule    Mont    1938    1940    -       Apr     lastSun 0:00    1:00    D
Rule    Mont    1938    1939    -       Sep     lastSun 0:00    0       S
Rule    Mont    1946    1973    -       Apr     lastSun 2:00    1:00    D
Rule    Mont    1945    1948    -       Sep     lastSun 2:00    0       S
Rule    Mont    1949    1950    -       Oct     lastSun 2:00    0       S
Rule    Mont    1951    1956    -       Sep     lastSun 2:00    0       S
Rule    Mont    1957    1973    -       Oct     lastSun 2:00    0       S
Zone America/Montreal   -4:54:16 -      LMT     1884
                        -5:00   Mont    E%sT    1918
                        -5:00   Canada  E%sT    1919
                        -5:00   Mont    E%sT    1942 Feb  9  2:00s
                        -5:00   Canada  E%sT    1946
                        -5:00   Mont    E%sT    1974
                        -5:00   Canada  E%sT

# Montserrat
# From Paul Eggert (2006-03-22):
# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
# world.gazetteer.com says Cork Hill is the most populous location now.
Zone America/Montserrat -4:08:52 -      LMT     1911 Jul  1  0:01 # Cork Hill
                        -4:00   -       AST

# The Bahamas
#
# For 1899 Milne gives -5:09:29.5; round that.
#
# From P Chan (2020-11-27, corrected on 2020-12-02):
# There were two periods of DST observed in 1942-1945: 1942-05-01
# midnight to 1944-12-31 midnight and 1945-02-01 to 1945-10-17 midnight.
# "midnight" should mean 24:00 from the context.
#
# War Time Order 1942 [1942-05-01] and War Time (No. 2) Order 1942  [1942-09-29]
# Appendix to the Statutes of 7 George VI. and the Year 1942. p 34, 43
# https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA3-PA34
# https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA3-PA43
#
# War Time Order 1943 [1943-03-31] and War Time Order 1944 [1943-12-29]
# Appendix to the Statutes of 8 George VI. and the Year 1943. p 9-10, 28-29
# https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA4-PA9
# https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA4-PA28
#
# War Time Order 1945 [1945-01-31] and the Order which revoke War Time Order
# 1945 [1945-10-16] Appendix to the Statutes of 9 George VI. and the Year
# 1945. p 160, 247-248
# https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA6-PA160
# https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA6-PA247
#
# From Sue Williams (2006-12-07):
# The Bahamas announced about a month ago that they plan to change their DST
# rules to sync with the U.S. starting in 2007....
# http://www.jonesbahamas.com/?c=45&a=10412

Rule    Bahamas 1942    only    -       May      1      24:00   1:00    W
Rule    Bahamas 1944    only    -       Dec     31      24:00   0       S
Rule    Bahamas 1945    only    -       Feb      1      0:00    1:00    W
Rule    Bahamas 1945    only    -       Aug     14      23:00u  1:00    P # Peace
Rule    Bahamas 1945    only    -       Oct     17      24:00   0       S
Rule    Bahamas 1964    1975    -       Oct     lastSun 2:00    0       S
Rule    Bahamas 1964    1975    -       Apr     lastSun 2:00    1:00    D

Zone    America/Nassau  -5:09:30 -      LMT     1912 Mar 2
                        -5:00   Bahamas E%sT    1976
                        -5:00   US      E%sT

# Canada
# From Chris Walton (2022-10-15):
# I would also like to see America/Nipigon and America/Rainy_River converted
# into link entries because I have zero faith in the current Shanks based data.
# From Paul Eggert (2022-10-15):
# These are now links in the primary data.  Also see America/Thunder_Bay.
Zone America/Nipigon    -5:53:04 -      LMT     1895
                        -5:00   Canada  E%sT    1940 Sep 29
                        -5:00   1:00    EDT     1942 Feb  9  2:00s
                        -5:00   Canada  E%sT

# From Rives McDow (1999-11-08):
# On October 31, when the rest of Nunavut went to Central time,
# Pangnirtung wobbled.  Here is the result of their wobble:
#
# The following businesses and organizations in Pangnirtung use Central Time:
#
#       First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
#       Eastern Arctic National Parks, A & D Specialist
#
# The following businesses and organizations in Pangnirtung use Eastern Time:
#
#       Hamlet office, All other businesses, Both schools, Airport operator
#
# This has made for an interesting situation there, which warranted the news.
# No one there that I spoke with seems concerned, or has plans to
# change the local methods of keeping time, as it evidently does not
# really interfere with any activities or make things difficult locally.
# They plan to celebrate New Year's turn-over twice, one hour apart,
# so it appears that the situation will last at least that long.
# The Nunavut Intergovernmental Affairs hopes that they will "come to
# their senses", but the locals evidently don't see any problem with
# the current state of affairs.

# From Michaela Rodrigue, writing in the
# Nunatsiaq News (1999-11-19):
# http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html
# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
# central - or Nunavut time - for government offices, and eastern time
# for municipal offices and schools....  Igloolik [was similar but then]
# made the switch to central time on Saturday, Nov. 6.

# From Chris Walton (2022-11-06):
# The implication is that Pangnirtung and Qikiqtarjuaq have observed Eastern
# Time as far back as 1984 (and likely even further back than that).
# It is possible that these communities never actually observed Atlantic
# Time, but that would be difficult to prove.
# From Paul Eggert (2022-11-06):
# This is in 'backzone' as we have no good evidence that Pangnirtung differs
# from America/Iqaluit since 1970.  A Google Books snippet view of
# volume 2, page 186 of "Pilot of Arctic Canada", published 1959 by
# the Canadian Hydrographic Service, suggests (though does not state)
# that Pangnirtung observed EST then.
#
# aka Panniqtuuq
Zone America/Pangnirtung 0      -       -00     1921 # trading post est.
                        -5:00   NT_YK   E%sT    1999 Oct 31  2:00
                        -6:00   Canada  C%sT    2000 Oct 29  2:00
                        -5:00   Canada  E%sT

# United States
#
# From Paul Eggert (2018-03-18):
# America/Palm_Springs would be tricky, as it kept two sets of clocks
# in 1946/7.  See the following notes.
#
# From Steve Allen (2018-01-19):
# The shadow of Mt. San Jacinto brings darkness very early in the winter
# months.  In 1946 the chamber of commerce decided to put the clocks of Palm
# Springs forward by an hour in the winter.
# https://www.desertsun.com/story/life/2017/12/27/palm-springs-struggle-daylight-savings-time-and-idea-sun-time/984416001/
# Desert Sun, Number 18, 1 November 1946
# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=DS19461101
# has proposal for meeting on front page and page 21.
# Desert Sun, Number 19, 5 November 1946
# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=DS19461105
# reports that Sun Time won at the meeting on front page and page 5.
# Desert Sun, Number 37, 7 January 1947
# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=DS19470107.2.12
# front page reports request to abandon Sun Time and page 7 notes a "class war".
# Desert Sun, Number 38, 10 January 1947
# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=DS19470110
# front page reports on end.

# Trinidad and Tobago
Zone America/Port_of_Spain -4:06:04 -   LMT     1912 Mar 2
                        -4:00   -       AST
Link America/Port_of_Spain America/Marigot
Link America/Port_of_Spain America/St_Barthelemy

# Canada
# From Chris Walton (2022-10-15):
# I would also like to see America/Nipigon and America/Rainy_River converted
# into link entries because I have zero faith in the current Shanks based data.
# From Paul Eggert (2022-10-15):
# These are now links in the primary data.  Also see America/Thunder_Bay.
Zone America/Rainy_River -6:18:16 -     LMT     1895
                        -6:00   Canada  C%sT    1940 Sep 29
                        -6:00   1:00    CDT     1942 Feb  9  2:00s
                        -6:00   Canada  C%sT

# Argentina
# This entry was intended for the following areas, but has been superseded by
# more detailed zones.
# Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
# Formosa (FM), La Pampa (LP), Chubut (CH)
Zone America/Rosario    -4:02:40 -      LMT     1894 Nov
                        -4:16:44 -      CMT     1920 May
                        -4:00   -       -04     1930 Dec
                        -4:00   Arg     -04/-03 1969 Oct  5
                        -3:00   Arg     -03/-02 1991 Jul
                        -3:00   -       -03     1999 Oct  3  0:00
                        -4:00   Arg     -04/-03 2000 Mar  3  0:00
                        -3:00   -       -03

# St Kitts-Nevis
Zone America/St_Kitts   -4:10:52 -      LMT     1912 Mar  2 # Basseterre
                        -4:00   -       AST

# St Lucia
Zone America/St_Lucia   -4:04:00 -      LMT     1890 # Castries
                        -4:04:00 -      CMT     1912 # Castries Mean Time
                        -4:00   -       AST

# US Virgin Is
Zone America/St_Thomas  -4:19:44 -      LMT     1911 Jul # Charlotte Amalie
                        -4:00   -       AST
Link America/St_Thomas America/Virgin

# St Vincent and the Grenadines
Zone America/St_Vincent -4:04:56 -      LMT     1890 # Kingstown
                        -4:04:56 -      KMT     1912 # Kingstown Mean Time
                        -4:00   -       AST

# Canada
#
# From Paul Eggert (2003-07-27):
# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
# Port Arthur, Ontario, the principle of the Bill has been in
# operation for the past three years, and in the City of Moose Jaw,
# Saskatchewan, for one year."
#
# From David Bryan via Tory Tronrud, Director/Curator,
# Thunder Bay Museum (2003-11-12):
# There is some suggestion, however, that, by-law or not, daylight
# savings time was being practiced in Fort William and Port Arthur
# before 1909.... [I]n 1910, the line between the Eastern and Central
# Time Zones was permanently moved about two hundred miles west to
# include the Thunder Bay area....  When Canada adopted daylight
# savings time in 1916, Fort William and Port Arthur, having done so
# already, did not change their clocks....  During the Second World
# War,... [t]he cities agreed to implement DST during the summer
# months for the remainder of the war years.
#
# From Jeffery Nichols (2020-02-06):
# According to the [Shanks] atlas, those western Ontario zones are huge,
# covering most of Ontario northwest of Sault Ste Marie and Timmins.
# The zones seem to include towns bigger than the ones they're named after,
# like Dryden in America/Rainy_River and Wawa (and maybe Attawapiskat) in
# America/Nipigon.  I assume it's too much trouble to change the name of the
# zone (like when you found out that America/Glace_Bay includes Sydney, Nova
# Scotia)....
#
# From Chris Walton (2022-10-15):
# The TZ database currently shows that Thunder Bay has observed daylight
# saving every year from 1970 onwards with the exception of 1973.
# Back in July I raised some doubts on this mailing list about the 1973 data.
# I now have more proof that it is wrong.
# [attached Chronicle-Journal front pages, 1973-04-28 and 1973-10-27]
#
# From Paul Eggert (2022-10-15):
# This is now a link in the primary data.  The following entry is
# from Shanks & Pottenger, with corrections as noted above.
#
Zone America/Thunder_Bay -5:57:00 -     LMT     1895
                        -6:00   -       CST     1910
                        -5:00   -       EST     1942
                        -5:00   Canada  E%sT    1970
                        -5:00   Toronto E%sT    1974
                        -5:00   Canada  E%sT

# British Virgin Is
Zone America/Tortola    -4:18:28 -      LMT     1911 Jul # Road Town
                        -4:00   -       AST

# Yellowknife, Northwest Territories
Zone America/Yellowknife 0      -       -00     1935 # Yellowknife founded?
                        -7:00   NT_YK   M%sT    1980
                        -7:00   Canada  M%sT

# Dumont d'Urville, Île des Pétrels, -6640+14001, since 1956-11
# <https://en.wikipedia.org/wiki/Dumont_d'Urville_Station> (2005-12-05)
#
# Another base at Port-Martin, 50km east, began operation in 1947.
# It was destroyed by fire on 1952-01-14.
#
Zone Antarctica/DumontDUrville 0 -      -00     1947
                        10:00   -       +10     1952 Jan 14
                        0       -       -00     1956 Nov
                        10:00   -       +10

# McMurdo, Ross Island, since 1955-12
Zone Antarctica/McMurdo 0       -       -00     1956
                        12:00   NZ      NZ%sT
Link Antarctica/McMurdo Antarctica/South_Pole

# Syowa, Antarctica
#
# From Hideyuki Suzuki (1999-02-06):
# In all Japanese stations, +0300 is used as the standard time.
#
# Syowa station, which is the first antarctic station of Japan,
# was established on 1957-01-29.  Since Syowa station is still the main
# station of Japan, it's appropriate for the principal location.
# See:
# NIPR Antarctic Research Activities (1999-08-17)
# http://www.nipr.ac.jp/english/ara01.html
Zone Antarctica/Syowa   0       -       -00     1957 Jan 29
                        3:00    -       +03

# Vostok, Antarctica
#
# Vostok, since 1957-12-16, temporarily closed 1994-02/1994-11
# From Craig Mundell (1994-12-15):
# http://quest.arc.nasa.gov/antarctica/QA/computers/Directions,Time,ZIP
# Vostok, which is one of the Russian stations, is set on the same
# time as Moscow, Russia.
#
# From Lee Hotz (2001-03-08):
# I queried the folks at Columbia who spent the summer at Vostok and this is
# what they had to say about time there:
# "in the US Camp (East Camp) we have been on New Zealand (McMurdo)
# time, which is 12 hours ahead of GMT. The Russian Station Vostok was
# 6 hours behind that (although only 2 miles away, i.e. 6 hours ahead
# of GMT). This is a time zone I think two hours east of Moscow. The
# natural time zone is in between the two: 8 hours ahead of GMT."
#
# From Paul Eggert (2001-05-04):
# This seems to be hopelessly confusing, so I asked Lee Hotz about it
# in person.  He said that some Antarctic locations set their local
# time so that noon is the warmest part of the day, and that this
# changes during the year and does not necessarily correspond to mean
# solar noon.  So the Vostok time might have been whatever the clocks
# happened to be during their visit.  So we still don't really know what time
# it is at Vostok.  But we'll guess +06.
#
Zone Antarctica/Vostok  0       -       -00     1957 Dec 16
                        6:00    -       +06

# Yemen
# Milne says 2:59:54 was the meridian of the saluting battery at Aden,
# and that Yemen was at 1:55:56, the meridian of the Hagia Sophia.
Zone    Asia/Aden       2:59:54 -       LMT     1950
                        3:00    -       +03

# Bahrain
#
# From Paul Eggert (2020-07-23):
# Most of this data comes from:
# Stewart A. Why Gulf Standard Time is far from standard: the fascinating story
# behind the time zone's invention. The National (Abu Dhabi). 2020-07-22.
# https://www.thenational.ae/arts-culture/why-gulf-standard-time-is-far-from-standard-the-fascinating-story-behind-the-time-zone-s-invention-1.1052589
# Stewart writes that before 1941 some companies in Bahrain were at +0330 and
# others at +0323.  Reginald George Alban, a British political agent based in
# Manama, worked to standardize this, and from 1941-07-20 Bahrain was at
# +0330.  However, BOAC asked that clocks be moved to gain more light at day's
# end, so Bahrain switched to +04 on 1944-01-01.
#
# Re the 1941 transition, Stewart privately sent me this citation:
# "File 16/53 Enquiries Re: Calculation of Local Time", British Library: India
# Office Records and Private Papers, IOR/R/15/2/1564, in Qatar Digital Library
# https://www.qdl.qa/archive/81055/vdc_100000000282.0x00012b
# It says there was no real standard in Bahrain before 1941-07-20.
# +0330 was used by steamers of the British India Co, by Petroleum Concessions
# and by Cable & Wireless; +0323 was used by the Eastern Bank Ltd, BOAC, and
# Bahrein Petroleum (Bapco), and California Arabian Standard Oil Co (Casoc)
# adopted DST effective 1941-05-24.  Alban suggested adopting DST, R.B. Coomb
# of C&W countersuggested +0330, and although C.A. Rodstrom of Casoc (formerly
# of Bapco) stated that Bahrain had formerly used +0330 before Bapco arrived
# but Bapco switched to +0323 because of "constant confusion", the consensus
# was +0330.  The government adopted +0330 in 1941-07-20 and companies seem to
# have switched by 08-01.  No time of day was given for the 1940s transitions.
Zone    Asia/Bahrain    3:22:20 -       LMT     1941 Jul 20  # Manamah
                        3:30    -       +0330   1944 Jan  1
                        4:00    -       +04     1972 Jun
                        3:00    -       +03

# Brunei
Zone    Asia/Brunei     7:39:40 -       LMT     1926 Mar # Bandar Seri Begawan
                        7:30    -       +0730   1933
                        8:00    -       +08

# India
#
# From Paul Eggert (2014-09-06):
# The 1876 Report of the Secretary of the [US] Navy, p 305 says that Madras
# civil time was 5:20:57.3.
#
# From Paul Eggert (2014-08-21):
# In tomorrow's The Hindu, Nitya Menon reports that India had two civil time
# zones starting in 1884, one in Bombay and one in Calcutta, and that railways
# used a third time zone based on Madras time (80° 18' 30" E).  Also,
# in 1881 Bombay briefly switched to Madras time, but switched back.  See:
# http://www.thehindu.com/news/cities/chennai/madras-375-when-madras-clocked-the-time/article6339393.ece
#Zone     Asia/Chennai  [not enough info to complete]

# China
# Long-shu Time (probably due to Long and Shu being two names of that area)
# Guangxi, Guizhou, Hainan, Ningxia, Sichuan, Shaanxi, and Yunnan;
# most of Gansu; west Inner Mongolia; west Qinghai; and the Guangdong
# counties Deqing, Enping, Kaiping, Luoding, Taishan, Xinxing,
# Yangchun, Yangjiang, Yu'nan, and Yunfu.
Zone    Asia/Chongqing  7:06:20 -       LMT     1928     # or Chungking
                        7:00    -       +07     1980 May
                        8:00    PRC     C%sT
Link Asia/Chongqing Asia/Chungking

# Vietnam
# From Paul Eggert (2014-10-13):
# See Asia/Ho_Chi_Minh for the source for this data.
# Trần's book says the 1954-55 transition to 07:00 in Hanoi was in
# October 1954, with exact date and time unspecified.
Zone    Asia/Hanoi      7:03:24 -       LMT     1906 Jul  1
                        7:06:30 -       PLMT    1911 May  1
                        7:00    -       +07     1942 Dec 31 23:00
                        8:00    -       +08     1945 Mar 14 23:00
                        9:00    -       +09     1945 Sep  2
                        7:00    -       +07     1947 Apr  1
                        8:00    -       +08     1954 Oct
                        7:00    -       +07

# China
# Changbai Time ("Long-white Time", Long-white = Heilongjiang area)
# Heilongjiang (except Mohe county), Jilin
Zone    Asia/Harbin     8:26:44 -       LMT     1928     # or Haerbin
                        8:30    -       +0830   1932 Mar
                        8:00    -       CST     1940
                        9:00    -       +09     1966 May
                        8:30    -       +0830   1980 May
                        8:00    PRC     C%sT

# far west China
Zone    Asia/Kashgar    5:03:56 -       LMT     1928     # or Kashi or Kaxgar
                        5:30    -       +0530   1940
                        5:00    -       +05     1980 May
                        8:00    PRC     C%sT

# peninsular Malaysia
# taken from Mok Ly Yng (2003-10-30)
# https://web.archive.org/web/20190822231045/http://www.math.nus.edu.sg/~mathelmr/teaching/timezone.html
# This agrees with Singapore since 1905-06-01.
Zone Asia/Kuala_Lumpur  6:46:46 -       LMT     1901 Jan  1
                        6:55:25 -       SMT     1905 Jun  1 # Singapore M.T.
                        7:00    -       +07     1933 Jan  1
                        7:00    0:20    +0720   1936 Jan  1
                        7:20    -       +0720   1941 Sep  1
                        7:30    -       +0730   1942 Feb 16
                        9:00    -       +09     1945 Sep 12
                        7:30    -       +0730   1981 Dec 31 16:00u
                        8:00    -       +08

# Kuwait
Zone    Asia/Kuwait     3:11:56 -       LMT     1950
                        3:00    -       +03


# Oman
# Milne says 3:54:24 was the meridian of the Muscat Tidal Observatory.
Zone    Asia/Muscat     3:54:24 -       LMT     1920
                        4:00    -       +04

# India
# From Paul Eggert (2014-08-11), after a heads-up from Stephen Colebourne:
# According to a Portuguese decree (1911-05-26)
# https://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
# Portuguese India switched to UT +05 on 1912-01-01.
#Zone   Asia/Panaji     [not enough info to complete]

# Cambodia

# From an adoptive daughter of the late Cambodian ruler Prince Sihanouk,
# via Alois Treindl (2019-08-08):
#
# King Sihanouk said that, during the Japanese occupation, starting with
# what historians refer to as "le coup de force du 9 mars 1945", Cambodia,
# like the entire French Indochina, used Tokyo time zone. After Japan
# surrendered, 2 September 1945, Cambodia fell under French rule again and
# adopted Hanoi time zone again.
#
# However, on 7 January 1946, Sihanouk and Tioulong managed to obtain a
# status of "internal autonomy" from the government of Charles de Gaulle.
# Although many fields remained under the administration of the French
# (customs, taxes, justice, defence, foreign affairs, etc.), the Cambodian
# administration was responsible for religious matters and traditional
# celebrations, which included our calendar and time.  The time zone was GMT
# + 7 and _no_ DST was applied.
#
# After Sihanouk and Tioulong achieved full independence, on 9 November 1953,
# GMT + 7 was maintained.

# From Paul Eggert (2019-08-26):
# See Asia/Ho_Chi_Minh for the source for most of rest of this data.

Zone    Asia/Phnom_Penh 6:59:40 -       LMT     1906 Jul  1
                        7:06:30 -       PLMT    1911 May  1
                        7:00    -       +07     1942 Dec 31 23:00
                        8:00    -       +08     1945 Mar 14 23:00
                        9:00    -       +09     1945 Sep  2
                        7:00    -       +07

# Israel
Zone    Asia/Tel_Aviv   2:19:04 -       LMT     1880
                        2:21    -       JMT     1918
                        2:00    Zion    I%sT

# Laos
# From Paul Eggert (2014-10-11):
# See Asia/Ho_Chi_Minh for the source for most of this data.
# Trần's book says that Laos reverted to UT +07 on 1955-04-15.
# Also, guess that Laos reverted to +07 on 1945-09-02, when Vietnam did;
# this is probably wrong but it's better than guessing no transition.
Zone    Asia/Vientiane  6:50:24 -       LMT     1906 Jul  1
                        7:06:30 -       PLMT    1911 May  1
                        7:00    -       +07     1942 Dec 31 23:00
                        8:00    -       +08     1945 Mar 14 23:00
                        9:00    -       +09     1945 Sep  2
                        7:00    -       +07     1947 Apr  1
                        8:00    -       +08     1955 Apr 15
                        7:00    -       +07

# Jan Mayen
# From Whitman:
Zone Atlantic/Jan_Mayen -1:00   -       -01

# Iceland
#
# From Adam David (1993-11-06):
# The name of the timezone in Iceland for system / mail / news purposes is GMT.
#
# (1993-12-05):
# This material is paraphrased from the 1988 edition of the University of
# Iceland Almanak.
#
# From January 1st, 1908 the whole of Iceland was standardised at 1 hour
# behind GMT. Previously, local mean solar time was used in different parts
# of Iceland, the almanak had been based on Reykjavík mean solar time which
# was 1 hour and 28 minutes behind GMT.
#
# "first day of winter" referred to [below] means the first day of the 26 weeks
# of winter, according to the old icelandic calendar that dates back to the
# time the norsemen first settled Iceland.  The first day of winter is always
# Saturday, but is not dependent on the Julian or Gregorian calendars.
#
# (1993-12-10):
# I have a reference from the Oxford Icelandic-English dictionary for the
# beginning of winter, which ties it to the ecclesiastical calendar (and thus
# to the julian/gregorian calendar) over the period in question.
#       the winter begins on the Saturday next before St. Luke's day
#       (old style), or on St. Luke's day, if a Saturday.
# St. Luke's day ought to be traceable from ecclesiastical sources. "old style"
# might be a reference to the Julian calendar as opposed to Gregorian, or it
# might mean something else (???).
#
# From Paul Eggert (2014-11-22):
# The information below is taken from the 1988 Almanak; see
# http://www.almanak.hi.is/klukkan.html
#
Rule    Iceland 1917    1919    -       Feb     19      23:00   1:00    -
Rule    Iceland 1917    only    -       Oct     21       1:00   0       -
Rule    Iceland 1918    1919    -       Nov     16       1:00   0       -
Rule    Iceland 1921    only    -       Mar     19      23:00   1:00    -
Rule    Iceland 1921    only    -       Jun     23       1:00   0       -
Rule    Iceland 1939    only    -       Apr     29      23:00   1:00    -
Rule    Iceland 1939    only    -       Oct     29       2:00   0       -
Rule    Iceland 1940    only    -       Feb     25       2:00   1:00    -
Rule    Iceland 1940    1941    -       Nov     Sun>=2   1:00s  0       -
Rule    Iceland 1941    1942    -       Mar     Sun>=2   1:00s  1:00    -
# 1943-1946 - first Sunday in March until first Sunday in winter
Rule    Iceland 1943    1946    -       Mar     Sun>=1   1:00s  1:00    -
Rule    Iceland 1942    1948    -       Oct     Sun>=22  1:00s  0       -
# 1947-1967 - first Sunday in April until first Sunday in winter
Rule    Iceland 1947    1967    -       Apr     Sun>=1   1:00s  1:00    -
# 1949 and 1967 Oct transitions delayed by 1 week
Rule    Iceland 1949    only    -       Oct     30       1:00s  0       -
Rule    Iceland 1950    1966    -       Oct     Sun>=22  1:00s  0       -
Rule    Iceland 1967    only    -       Oct     29       1:00s  0       -

Zone Atlantic/Reykjavik -1:28   -       LMT     1908
                        -1:00   Iceland -01/+00 1968 Apr  7  1:00s
                         0:00   -       GMT
Link Atlantic/Reykjavik Iceland

# St Helena
Zone Atlantic/St_Helena -0:22:48 -      LMT     1890 # Jamestown
                        -0:22:48 -      JMT     1951 # Jamestown Mean Time
                         0:00   -       GMT

# King Island
Zone Australia/Currie   9:35:28 -       LMT     1895 Sep
                        10:00   AT      AE%sT   1919 Oct 24
                        10:00   Aus     AE%sT   1968 Oct 15
                        10:00   AT      AE%sT


# Netherlands

# Howse writes that the Netherlands' railways used GMT between 1892 and 1940,
# but for other purposes the Netherlands used Amsterdam mean time.

# However, Robert H. van Gent writes (2001-04-01):
# Howse's statement is only correct up to 1909. From 1909-05-01 (00:00:00
# Amsterdam mean time) onwards, the whole of the Netherlands (including
# the Dutch railways) was required by law to observe Amsterdam mean time
# (19 minutes 32.13 seconds ahead of GMT). This had already been the
# common practice (except for the railways) for many decades but it was
# not until 1909 when the Dutch government finally defined this by law.
# On 1937-07-01 this was changed to 20 minutes (exactly) ahead of GMT and
# was generally known as Dutch Time ("Nederlandse Tijd").
#
# (2001-04-08):
# 1892-05-01 was the date when the Dutch railways were by law required to
# observe GMT while the remainder of the Netherlands adhered to the common
# practice of following Amsterdam mean time.
#
# (2001-04-09):
# In 1835 the authorities of the province of North Holland requested the
# municipal authorities of the towns and cities in the province to observe
# Amsterdam mean time but I do not know in how many cases this request was
# actually followed.
#
# From 1852 onwards the Dutch telegraph offices were by law required to
# observe Amsterdam mean time. As the time signals from the observatory of
# Leiden were also distributed by the telegraph system, I assume that most
# places linked up with the telegraph (and railway) system automatically
# adopted Amsterdam mean time.
#
# Although the early Dutch railway companies initially observed a variety
# of times, most of them had adopted Amsterdam mean time by 1858 but it
# was not until 1866 when they were all required by law to observe
# Amsterdam mean time.

# The data entries before 1945 are taken from
# https://www.staff.science.uu.nl/~gent0113/wettijd/wettijd.htm

# From Paul Eggert (2021-05-09):
# I invented the abbreviations AMT for Amsterdam Mean Time and NST for
# Netherlands Summer Time, used in the Netherlands from 1835 to 1937.

Rule    Neth    1916    only    -       May      1      0:00    1:00    NST     # Netherlands Summer Time
Rule    Neth    1916    only    -       Oct      1      0:00    0       AMT     # Amsterdam Mean Time
Rule    Neth    1917    only    -       Apr     16      2:00s   1:00    NST
Rule    Neth    1917    only    -       Sep     17      2:00s   0       AMT
Rule    Neth    1918    1921    -       Apr     Mon>=1  2:00s   1:00    NST
Rule    Neth    1918    1921    -       Sep     lastMon 2:00s   0       AMT
Rule    Neth    1922    only    -       Mar     lastSun 2:00s   1:00    NST
Rule    Neth    1922    1936    -       Oct     Sun>=2  2:00s   0       AMT
Rule    Neth    1923    only    -       Jun     Fri>=1  2:00s   1:00    NST
Rule    Neth    1924    only    -       Mar     lastSun 2:00s   1:00    NST
Rule    Neth    1925    only    -       Jun     Fri>=1  2:00s   1:00    NST
# From 1926 through 1939 DST began 05-15, except that it was delayed by a week
# in years when 05-15 fell in the Pentecost weekend.
Rule    Neth    1926    1931    -       May     15      2:00s   1:00    NST
Rule    Neth    1932    only    -       May     22      2:00s   1:00    NST
Rule    Neth    1933    1936    -       May     15      2:00s   1:00    NST
Rule    Neth    1937    only    -       May     22      2:00s   1:00    NST
Rule    Neth    1937    only    -       Jul      1      0:00    1:00    S
Rule    Neth    1937    1939    -       Oct     Sun>=2  2:00s   0       -
Rule    Neth    1938    1939    -       May     15      2:00s   1:00    S
Rule    Neth    1945    only    -       Apr      2      2:00s   1:00    S
Rule    Neth    1945    only    -       Sep     16      2:00s   0       -
                #STDOFF 0:19:32.13
Zone Europe/Amsterdam   0:19:32 -       LMT     1835
                        0:19:32 Neth    %s      1937 Jul  1
                        0:20    Neth +0020/+0120 1940 May 16  0:00
                        1:00    C-Eur   CE%sT   1945 Apr  2  2:00
                        1:00    Neth    CE%sT   1977
                        1:00    EU      CE%sT


# Northern Ireland
Zone    Europe/Belfast  -0:23:40 -      LMT     1880 Aug  2
                        -0:25:21 -      DMT     1916 May 21  2:00
                                                # DMT = Dublin/Dunsink MT
                        -0:25:21 1:00   IST     1916 Oct  1  2:00s
                                                # IST = Irish Summer Time
                         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


# Denmark

# From Jesper Nørgaard Welen (2005-04-26):
# the law [introducing standard time] was in effect from 1894-01-01....
# The page https://www.retsinformation.dk/eli/lta/1893/83
# confirms this, and states that the law was put forth 1893-03-29.
#
# The EU [actually, EEC and Euratom] treaty with effect from 1973:
# https://www.retsinformation.dk/eli/lta/1972/21100
#
# This provoked a new law from 1974 to make possible summer time changes
# in subsequent decrees with the law
# https://www.retsinformation.dk/eli/lta/1974/223
#
# It seems however that no decree was set forward until 1980.  I have
# not found any decree, but in another related law, the effecting DST
# changes are stated explicitly to be from 1980-04-06 at 02:00 to
# 1980-09-28 at 02:00.  If this is true, this differs slightly from
# the EU rule in that DST runs to 02:00, not 03:00.  We don't know
# when Denmark began using the EU rule correctly, but we have only
# confirmation of the 1980-time, so I presume it was correct in 1981:
# The law is about the management of the extra hour, concerning
# working hours reported and effect on obligatory-rest rules (which
# was suspended on that night):
# https://web.archive.org/web/20140104053304/https://www.retsinformation.dk/Forms/R0710.aspx?id=60267

# From Jesper Nørgaard Welen (2005-06-11):
# The Herning Folkeblad (1980-09-26) reported that the night between
# Saturday and Sunday the clock is set back from three to two.

# From Paul Eggert (2005-06-11):
# Hence the "02:00" of the 1980 law refers to standard time, not
# wall-clock time, and so the EU rules were in effect in 1980.

Rule    Denmark 1916    only    -       May     14      23:00   1:00    S
Rule    Denmark 1916    only    -       Sep     30      23:00   0       -
Rule    Denmark 1940    only    -       May     15       0:00   1:00    S
Rule    Denmark 1945    only    -       Apr      2       2:00s  1:00    S
Rule    Denmark 1945    only    -       Aug     15       2:00s  0       -
Rule    Denmark 1946    only    -       May      1       2:00s  1:00    S
Rule    Denmark 1946    only    -       Sep      1       2:00s  0       -
Rule    Denmark 1947    only    -       May      4       2:00s  1:00    S
Rule    Denmark 1947    only    -       Aug     10       2:00s  0       -
Rule    Denmark 1948    only    -       May      9       2:00s  1:00    S
Rule    Denmark 1948    only    -       Aug      8       2:00s  0       -
#
Zone Europe/Copenhagen   0:50:20 -      LMT     1890
                         0:50:20 -      CMT     1894 Jan  1 # Copenhagen MT
                         1:00   Denmark CE%sT   1942 Nov  2  2:00s
                         1:00   C-Eur   CE%sT   1945 Apr  2  2:00
                         1:00   Denmark CE%sT   1980
                         1:00   EU      CE%sT

# Guernsey
# Data from Joseph S. Myers
# https://mm.icann.org/pipermail/tz/2013-September/019883.html
# References to be added
# LMT is for Town Church, St. Peter Port, 49° 27' 17" N, 2° 32' 10" W.
Zone    Europe/Guernsey -0:10:09 -      LMT     1913 Jun 18
                         0:00   GB-Eire %s      1940 Jul  2
                         1:00   C-Eur   CE%sT   1945 May  8
                         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

# Isle of Man
#
# From Lester Caine (2013-09-04):
# The Isle of Man legislation is now on-line at
# <https://www.legislation.gov.im>, starting with the original Statutory
# Time Act in 1883 and including additional confirmation of some of
# the dates of the 'Summer Time' orders originating at
# Westminster.  There is a little uncertainty as to the starting date
# of the first summer time in 1916 which may have been announced a
# couple of days late.  There is still a substantial number of
# documents to work through, but it is thought that every GB change
# was also implemented on the island.
#
# AT4 of 1883 - The Statutory Time et cetera Act 1883 -
# LMT Location - 54.1508N -4.4814E - Tynwald Hill ( Manx parliament )
Zone Europe/Isle_of_Man -0:17:55 -      LMT     1883 Mar 30  0:00s
                         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

# Jersey
# Data from Joseph S. Myers
# https://mm.icann.org/pipermail/tz/2013-September/019883.html
# References to be added
# LMT is for Parish Church, St. Helier, 49° 11' 0.57" N, 2° 6' 24.33" W.
Zone    Europe/Jersey   -0:08:26 -      LMT     1898 Jun 11 16:00u
                         0:00   GB-Eire %s      1940 Jul  2
                         1:00   C-Eur   CE%sT   1945 May  8
                         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

# Slovenia
Zone Europe/Ljubljana   0:58:04 -       LMT     1884
                        1:00    -       CET     1941 Apr 18 23:00
                        1:00    C-Eur   CE%sT   1945 May  8  2:00s
                        1:00    1:00    CEST    1945 Sep 16  2:00s
                        1:00    -       CET     1982 Nov 27
                        1:00    EU      CE%sT


# Luxembourg

# Whitman disagrees with most of these dates in minor ways;
# go with Shanks & Pottenger.
Rule    Lux     1916    only    -       May     14      23:00   1:00    S
Rule    Lux     1916    only    -       Oct      1       1:00   0       -
Rule    Lux     1917    only    -       Apr     28      23:00   1:00    S
Rule    Lux     1917    only    -       Sep     17       1:00   0       -
Rule    Lux     1918    only    -       Apr     Mon>=15  2:00s  1:00    S
Rule    Lux     1918    only    -       Sep     Mon>=15  2:00s  0       -
Rule    Lux     1919    only    -       Mar      1      23:00   1:00    S
Rule    Lux     1919    only    -       Oct      5       3:00   0       -
Rule    Lux     1920    only    -       Feb     14      23:00   1:00    S
Rule    Lux     1920    only    -       Oct     24       2:00   0       -
Rule    Lux     1921    only    -       Mar     14      23:00   1:00    S
Rule    Lux     1921    only    -       Oct     26       2:00   0       -
Rule    Lux     1922    only    -       Mar     25      23:00   1:00    S
Rule    Lux     1922    only    -       Oct     Sun>=2   1:00   0       -
Rule    Lux     1923    only    -       Apr     21      23:00   1:00    S
Rule    Lux     1923    only    -       Oct     Sun>=2   2:00   0       -
Rule    Lux     1924    only    -       Mar     29      23:00   1:00    S
Rule    Lux     1924    1928    -       Oct     Sun>=2   1:00   0       -
Rule    Lux     1925    only    -       Apr      5      23:00   1:00    S
Rule    Lux     1926    only    -       Apr     17      23:00   1:00    S
Rule    Lux     1927    only    -       Apr      9      23:00   1:00    S
Rule    Lux     1928    only    -       Apr     14      23:00   1:00    S
Rule    Lux     1929    only    -       Apr     20      23:00   1:00    S

Zone Europe/Luxembourg  0:24:36 -       LMT     1904 Jun
                        1:00    Lux     CE%sT   1918 Nov 25
                        0:00    Lux     WE%sT   1929 Oct  6  2:00s
                        0:00    Belgium WE%sT   1940 May 14  3:00
                        1:00    C-Eur   WE%sT   1944 Sep 18  3:00
                        1:00    Belgium CE%sT   1977
                        1:00    EU      CE%sT

# Monaco
#
# From Michael Deckers (2020-06-12):
# In the "Journal de Monaco" of 1892-05-24, online at
# https://journaldemonaco.gouv.mc/var/jdm/storage/original/application/b1c67c12c5af11b41ea888fb048e4fe8.pdf
# we read: ...
#  [In virtue of a Sovereign Ordinance of the May 13 of the current [year],
#   legal time in the Principality will be set to, from the date of June 1,
#   1892 onwards, to the meridian of Paris, as in France.]
# In the "Journal de Monaco" of 1911-03-28, online at
# https://journaldemonaco.gouv.mc/var/jdm/storage/original/application/de74ffb7db53d4f599059fe8f0ed482a.pdf
# we read an ordinance of 1911-03-16: ...
#  [Legal time in the Principality will be set, from the date of promulgation
#   of the present ordinance, to legal time in France....  Consequently, legal
#   time will be retarded by 9 minutes and 21 seconds.]
#
Zone    Europe/Monaco   0:29:32 -       LMT     1892 Jun  1
                        0:09:21 -       PMT     1911 Mar 29 # Paris Mean Time
                        0:00    France  WE%sT   1945 Sep 16  3:00
                        1:00    France  CE%sT   1977
                        1:00    EU      CE%sT


# Norway

# http://met.no/met/met_lex/q_u/sommertid.html (2004-01) agrees with Shanks &
# Pottenger.
Rule    Norway  1916    only    -       May     22      1:00    1:00    S
Rule    Norway  1916    only    -       Sep     30      0:00    0       -
Rule    Norway  1945    only    -       Apr      2      2:00s   1:00    S
Rule    Norway  1945    only    -       Oct      1      2:00s   0       -
Rule    Norway  1959    1964    -       Mar     Sun>=15 2:00s   1:00    S
Rule    Norway  1959    1965    -       Sep     Sun>=15 2:00s   0       -
Rule    Norway  1965    only    -       Apr     25      2:00s   1:00    S

Zone    Europe/Oslo     0:43:00 -       LMT     1895 Jan  1
                        1:00    Norway  CE%sT   1940 Aug 10 23:00
                        1:00    C-Eur   CE%sT   1945 Apr  2  2:00
                        1:00    Norway  CE%sT   1980
                        1:00    EU      CE%sT
Link    Europe/Oslo     Arctic/Longyearbyen
#PACKRATLIST zone.tab Link Europe/Oslo Atlantic/Jan_Mayen

# Bosnia and Herzegovina
Zone    Europe/Sarajevo 1:13:40 -       LMT     1884
                        1:00    -       CET     1941 Apr 18 23:00
                        1:00    C-Eur   CE%sT   1945 May  8  2:00s
                        1:00    1:00    CEST    1945 Sep 16  2:00s
                        1:00    -       CET     1982 Nov 27
                        1:00    EU      CE%sT

# North Macedonia
Zone    Europe/Skopje   1:25:44 -       LMT     1884
                        1:00    -       CET     1941 Apr 18 23:00
                        1:00    C-Eur   CE%sT   1945 May  8  2:00s
                        1:00    1:00    CEST    1945 Sep 16  2:00s
                        1:00    -       CET     1982 Nov 27
                        1:00    EU      CE%sT


# Sweden

# From Ivan Nilsson (2001-04-13), superseding Shanks & Pottenger:
#
# The law "Svensk författningssamling 1878, no 14" about standard time in 1879:
# From the beginning of 1879 (that is 01-01 00:00) the time for all
# places in the country is "the mean solar time for the meridian at
# three degrees, or twelve minutes of time, to the west of the
# meridian of the Observatory of Stockholm".  The law is dated 1878-05-31.
#
# The observatory at that time had the meridian 18° 03' 30"
# eastern longitude = 01:12:14 in time.  Less 12 minutes gives the
# national standard time as 01:00:14 ahead of GMT....
#
# About the beginning of CET in Sweden. The lawtext ("Svensk
# författningssamling 1899, no 44") states, that "from the beginning
# of 1900... ... the same as the mean solar time for the meridian at
# the distance of one hour of time from the meridian of the English
# observatory at Greenwich, or at 12 minutes 14 seconds to the west
# from the meridian of the Observatory of Stockholm". The law is dated
# 1899-06-16.  In short: At 1900-01-01 00:00:00 the new standard time
# in Sweden is 01:00:00 ahead of GMT.
#
# 1916: The lawtext ("Svensk författningssamling 1916, no 124") states
# that "1916-05-15 is considered to begin one hour earlier". It is
# pretty obvious that at 05-14 23:00 the clocks are set to 05-15 00:00....
# Further the law says, that "1916-09-30 is considered to end one hour later".
#
# The laws regulating [DST] are available on the site of the Swedish
# Parliament beginning with 1985 - the laws regulating 1980/1984 are
# not available on the site (to my knowledge they are only available
# in Swedish): <http://www.riksdagen.se/english/work/sfst.asp> (type
# "sommartid" without the quotes in the field "Fritext" and then click
# the Sök-button).
#
# (2001-05-13):
#
# I have now found a newspaper stating that at 1916-10-01 01:00
# summertime the church-clocks etc were set back one hour to show
# 1916-10-01 00:00 standard time.  The article also reports that some
# people thought the switch to standard time would take place already
# at 1916-10-01 00:00 summer time, but they had to wait for another
# hour before the event took place.
#
# Source: The newspaper "Dagens Nyheter", 1916-10-01, page 7 upper left.

# An extra-special abbreviation style is SET for Swedish Time (svensk
# normaltid) 1879-1899, 3° west of the Stockholm Observatory.

Zone Europe/Stockholm   1:12:12 -       LMT     1879 Jan  1
                        1:00:14 -       SET     1900 Jan  1 # Swedish Time
                        1:00    -       CET     1916 May 14 23:00
                        1:00    1:00    CEST    1916 Oct  1  1:00
                        1:00    -       CET     1980
                        1:00    EU      CE%sT


# Moldova / Transnistria
Zone    Europe/Tiraspol 1:58:32 -       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 1991 Mar 31  2:00
                        2:00    Russia  EE%sT   1992 Jan 19  2:00
                        3:00    Russia  MSK/MSD

# Ukraine
#
# Although Shanks & Pottenger say Transcarpathia used CET 1990/1991,
# this unreliable source contradicts contemporaneous government resolutions
# (see the commentary for Ukraine in the 'europe' file)
# so for now this dubious zone is in 'backzone'.
# "Uzhhorod" is the transliteration of the Ukrainian spelling, but
# "Uzhgorod" was a common English spelling when this dubious zone was
# added to TZDB in 1999.
Zone Europe/Uzhgorod    1:29:12 -       LMT     1890 Oct
                        1:00    -       CET     1940
                        1:00    C-Eur   CE%sT   1944 Oct
                        1:00    1:00    CEST    1944 Oct 26
                        1:00    -       CET     1945 Jun 29
                        3:00    Russia  MSK/MSD 1990
                        3:00    -       MSK     1990 Jul  1  2:00
                        1:00    -       CET     1991 Mar 31  3:00
                        2:00    -       EET     1992 Mar 20
                        2:00    C-Eur   EE%sT   1996 May 13
                        2:00    EU      EE%sT

# Liechtenstein

# From Paul Eggert (2022-07-21):
# Shanks & Pottenger say Vaduz is like Zurich starting June 1894.

# From Alois Treindl (2019-07-04):
# I was able to access the online archive of the Vaduz paper Vaterland ...
# I could confirm from the paper that Liechtenstein did in fact follow
# the same DST in 1941 and 1942 as Switzerland did.

Zone    Europe/Vaduz    0:38:04 -       LMT     1894 Jun
                        1:00    Swiss   CE%sT   1981
                        1:00    EU      CE%sT

# Croatia
Zone    Europe/Zagreb   1:03:52 -       LMT     1884
                        1:00    -       CET     1941 Apr 18 23:00
                        1:00    C-Eur   CE%sT   1945 May  8  2:00s
                        1:00    1:00    CEST    1945 Sep 16  2:00s
                        1:00    -       CET     1982 Nov 27
                        1:00    EU      CE%sT

# Ukraine

# Although Shanks & Pottenger say Zaporizhzhia and eastern Lugansk
# observed DST 1990/1991, this unreliable source contradicts contemporaneous
# government resolutions (see the commentary for Ukraine in the 'europe' file)
# so for now this dubious zone is in 'backzone'.
# "Zaporizhzhia" is the transliteration of the Ukrainian name, but
# "Zaporozhye" was a common English spelling when this dubious zone was
# added to TZDB in 1999.
Zone Europe/Zaporozhye  2:20:40 -       LMT     1880
                        2:20    -       +0220   1924 May  2
                        2:00    -       EET     1930 Jun 21
                        3:00    -       MSK     1941 Aug 25
                        1:00    C-Eur   CE%sT   1943 Oct 25
                        3:00    Russia  MSK/MSD 1991 Mar 31  2:00
                        2:00    E-Eur   EE%sT   1992 Mar 20
                        2:00    C-Eur   EE%sT   1996 May 13
                        2:00    EU      EE%sT

# Madagascar
Zone Indian/Antananarivo 3:10:04 -      LMT     1911 Jul
                        3:00    -       EAT     1954 Feb 27 23:00s
                        3:00    1:00    EAST    1954 May 29 23:00s
                        3:00    -       EAT

# Christmas
Zone Indian/Christmas   7:02:52 -       LMT     1895 Feb
                        7:00    -       +07

# Cocos (Keeling) Is
# These islands were ruled by the Ross family from about 1830 to 1978.
# We don't know when standard time was introduced; for now, we guess 1900.
Zone    Indian/Cocos    6:27:40 -       LMT     1900
                        6:30    -       +0630

# Comoros
Zone    Indian/Comoro   2:53:04 -       LMT     1911 Jul # Moroni, Gran Comoro
                        3:00    -       EAT

# Kerguelen
Zone Indian/Kerguelen   0       -       -00     1950 # Port-aux-Français
                        5:00    -       +05

# Seychelles
#
# From P Chan (2020-11-27):
# Standard Time was adopted on 1907-01-01.
#
# Standard Time Ordinance (Chapter 237)
# The Laws of Seychelles in Force on the 31st December, 1971, Vol. 6, p 571
# https://books.google.com/books?id=efE-AQAAIAAJ&pg=PA571
#
# From Tim Parenti (2020-12-05):
# A footnote on https://books.google.com/books?id=DYdDAQAAMAAJ&pg=PA1689
# confirms that Ordinance No. 9 of 1906 "was brought into force on the 1st
# January, 1907."

Zone    Indian/Mahe     3:41:48 -       LMT     1907 Jan  1 # Victoria
                        4:00    -       +04
# From Paul Eggert (2001-05-30):
# Aldabra, Farquhar, and Desroches, originally dependencies of the
# Seychelles, were transferred to the British Indian Ocean Territory
# in 1965 and returned to Seychelles control in 1976.  We don't know
# whether this affected their time zone, so omit this for now.
# Possibly the islands were uninhabited.


# Mayotte
Zone    Indian/Mayotte  3:00:56 -       LMT     1911 Jul # Mamoutzou
                        3:00    -       EAT

# Réunion
Zone    Indian/Reunion  3:41:52 -       LMT     1911 Jun # Saint-Denis
                        4:00    -       +04
#
# Scattered Islands (Îles Éparses) administered from Réunion are as follows.
# The following information about them is taken from
# Îles Éparses (<http://www.outre-mer.gouv.fr/domtom/ile.htm>, 1997-07-22,
# in French; no longer available as of 1999-08-17).
# We have no info about their time zone histories.
#
# Bassas da India - uninhabited
# Europa Island - inhabited from 1905 to 1910 by two families
# Glorioso Is - inhabited until at least 1958
# Juan de Nova - uninhabited
# Tromelin - inhabited until at least 1958

# Micronesia
# Also see Pacific/Pohnpei and commentary for Micronesia in 'australasia'.
#
# From Paul Eggert (2018-11-18):
# Alan Eugene Davis writes (1996-03-16),
# "I am certain, having lived there for the past decade, that 'Truk'
# (now properly known as Chuuk) ... is in the time zone GMT+10."
# Shanks & Pottenger write that Truk switched from UT +10 to +11
# on 1978-10-01; ignore this for now.
Zone Pacific/Chuuk      -13:52:52 -     LMT     1844 Dec 31
                         10:07:08 -     LMT     1901
                         10:00  -       +10     1914 Oct
                          9:00  -       +09     1919 Feb  1
                         10:00  -       +10     1941 Apr  1
                          9:00  -       +09     1945 Aug
                         10:00  -       +10
Link Pacific/Chuuk Pacific/Truk
Link Pacific/Chuuk Pacific/Yap

# Phoenix Islands, Kiribati
# From Paul Eggert (2021-05-27):
# Enderbury was inhabited 1860/1880s to mine guano, and 1938-03-06/1942-02-09
# for aviation (ostensibly commercial, but military uses foreseen).
# The 19th-century dates are approximate.  See Pacific/Kanton for
# the currently inhabited representative for this timezone.
Zone Pacific/Enderbury  0       -       -00     1860
                        -11:24:20 -     LMT     1885
                        0       -       -00     1938 Mar  6
                        -12:00  -       -12     1942 Feb  9
                        0       -       -00

# Tuvalu
Zone Pacific/Funafuti   11:56:52 -      LMT     1901
                        12:00   -       +12

# Johnston
Zone Pacific/Johnston   -10:00  -       HST

# Marshall Is
Zone Pacific/Majuro      11:24:48 -     LMT     1901
                         11:00  -       +11     1914 Oct
                          9:00  -       +09     1919 Feb  1
                         11:00  -       +11     1937
                         10:00  -       +10     1941 Apr  1
                          9:00  -       +09     1944 Jan 30
                         11:00  -       +11     1969 Oct
                         12:00  -       +12

# Midway
#
# From Mark Brader (2005-01-23):
# [Fallacies and Fantasies of Air Transport History, by R.E.G. Davies,
# published 1994 by Paladwr Press, McLean, VA, USA; ISBN 0-9626483-5-3]
# reproduced a Pan American Airways timetable from 1936, for their weekly
# "Orient Express" flights between San Francisco and Manila, and connecting
# flights to Chicago and the US East Coast.  As it uses some time zone
# designations that I've never seen before:....
# Fri. 6:30A Lv. HONOLOLU (Pearl Harbor), H.I.   H.L.T. Ar. 5:30P Sun.
#  "   3:00P Ar. MIDWAY ISLAND . . . . . . . . . M.L.T. Lv. 6:00A  "
#
Zone Pacific/Midway     -11:49:28 -     LMT     1901
                        -11:00  -       -11     1956 Jun  3
                        -11:00  1:00    -10     1956 Sep  2
                        -11:00  -       SST     # S=Samoa

# Micronesia
# Also see Pacific/Chuuk and commentary for Micronesia in 'australasia'.
Zone Pacific/Pohnpei    -13:27:08 -     LMT     1844 Dec 31     # Kolonia
                         10:32:52 -     LMT     1901
                         11:00  -       +11     1914 Oct
                          9:00  -       +09     1919 Feb  1
                         11:00  -       +11     1937
                         10:00  -       +10     1941 Apr  1
                          9:00  -       +09     1945 Aug
                         11:00  -       +11
Link Pacific/Pohnpei Pacific/Ponape

# N Mariana Is
#
# From Paul Eggert (2022-08-16):
# Although Shanks & Pottenger say Saipan used +09 and then switched
# to Guam time in October 1969, this is surely wrong.
# Saipan used Guam time in the late 1950s; see page 4 of the minutes on the
# conference of the 12th Saipan Legislature and the Select Committee on
# Saipan Mission, 5th Guam Legislature (1959-09-11):
# http://www.nmhcouncil.org/nmhc_archives/U.S.%20Navy%20Civil%20Affairs%20Files%201944-1962/1959/1959%2009%2017%20letter,%20minutes%20of%20conference,%20Borja.pdf
# For now, assume Saipan switched to Guam time after the Battle of Saipan.
#
Zone Pacific/Saipan     -14:17:00 -     LMT     1844 Dec 31
                         9:43:00 -      LMT     1901
                         9:00   -       +09     1944 Jul  9
                        10:00   Guam    G%sT    2000 Dec 23
                        10:00   -       ChST    # Chamorro Standard Time


# Wake

# From Vernice Anderson, Personal Secretary to Philip Jessup,
# US Ambassador At Large (oral history interview, 1971-02-02):
#
# Saturday, the 14th [of October, 1950] - ...  The time was all the
# more confusing at that point, because we had crossed the
# International Date Line, thus getting two Sundays.  Furthermore, we
# discovered that Wake Island had two hours of daylight saving time
# making calculation of time in Washington difficult if not almost
# impossible.
#
# https://www.trumanlibrary.org/oralhist/andrsonv.htm

# From Paul Eggert (2003-03-23):
# We have no other report of DST in Wake Island, so omit this info for now.

# Also see commentary for Micronesia in 'australasia'.
Zone    Pacific/Wake    11:06:28 -      LMT     1901
                        12:00   -       +12


# Wallis and Futuna
Zone    Pacific/Wallis  12:15:20 -      LMT     1901
                        12:00   -       +12

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