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.


# 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.
#
# As explained in the zic man page, the zone columns are:
# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]

# 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

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

# Gambia
Zone	Africa/Banjul	-1:06:36 -	LMT	1912
			-1:06:36 -	BMT	1935 # Banjul Mean Time
			-1:00	-	-01	1964
			 0:00	-	GMT

# Malawi
Zone	Africa/Blantyre	2:20:00 -	LMT	1903 Mar
			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 Paul Eggert (2014-08-12):
# The following table is from Shanks & Pottenger, but it can't be right.
# Whitman gives Mar 31 - Aug 31 for 1931 on.
# The International Hydrographic Bulletin, 1932-33, p 63 says that
# Sierra Leone would advance its clocks by 20 minutes on 1933-10-01.
# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	SL	1935	1942	-	Jun	 1	0:00	0:40	-0020
Rule	SL	1935	1942	-	Oct	 1	0:00	0	-01
Rule	SL	1957	1962	-	Jun	 1	0:00	1:00	+01
Rule	SL	1957	1962	-	Sep	 1	0:00	0	GMT
Zone	Africa/Freetown	-0:53:00 -	LMT	1882
			-0:53:00 -	FMT	1913 Jun # Freetown Mean Time
			-1:00	SL	%s	1957
			 0:00	SL	GMT/+01

# 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)
Zone Africa/Lubumbashi	1:49:52 -	LMT	1897 Nov 9
			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

# 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

# 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	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
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

# 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.

# 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

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

# 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

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

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

# 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

# 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

# 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

# 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

# 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

# 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

# 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

# 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

# Liechtenstein
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

# 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

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

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

# US minor outlying islands
Zone Pacific/Johnston	-10:00	-	HST

# US minor outlying islands
#
# 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	-	-11

# N Mariana Is
Zone Pacific/Saipan	-14:17:00 -	LMT	1844 Dec 31
			 9:43:00 -	LMT	1901
			 9:00	-	+09	1969 Oct
			10:00	-	+10	2000 Dec 23
			10:00	-	ChST	# Chamorro Standard Time