February 2017 - tz - lists.iana.org

TIme zones in the arts: xkcd #1799
by Ice Karma (J. Connell) 「氷宿縁」 Feb. 23, 2017

Feb. 23, 2017

Many of you may have already seen this, but for the benefit of those who have not: Bad Map Projection: Time Zones <https://xkcd.com/1799/> —Ice Karma

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[PROPOSED 1/7] Remove many invented abbrs in 'africa', 'backzone'
by Paul Eggert Feb. 23, 2017

Feb. 23, 2017

* NEWS: Document this. * africa (Atlantic/Cape_Verde, Africa/Accra, Africa/Bissau) (Africa/Nairobi, Africa/Monrovia, Indian/Mauritius, Africa/El_Aaiun) (Africa/Windhoek, Indian/Reunion, Indian/Mahe): * backzone (Africa/Bamako, Africa/Banjul, Africa/Conakry) (Africa/Dakar, Africa/Dar_es_Salaam, SL, Africa/Kampala): (Africa/Luanda, Africa/Mogadishu, Africa/Niamey, Africa/Nouakchott) (America/Argentina/ComodRivadavia, America/Aruba, America/Rosario) (Asia/Aden, Asia/Bahrain, Asia/Chongqing, Asia/Hanoi, Asia/Harbin) (Asia/Kashgar, Asia/Kuwait, Asia/Muscat, Asia/Phnom_Penh) (Asia/Vientiane, Atlantic/Jan_Mayen, Pacific/Midway, Pacific/Saipan): Prefer numeric time zone abbreviations to invented or dubious ones. --- NEWS | 30 ++++++++------ africa | 90 ++++++++++++++++++++---------------------- backzone | 136 +++++++++++++++++++++++++++++++-------------------------------- 3 files changed, 126 insertions(+), 130 deletions(-) diff --git a/NEWS b/NEWS index b3273ce..185524f 100644 --- a/NEWS +++ b/NEWS @@ -39,19 +39,23 @@ Unreleased, experimental changes new zone. Similarly, switch from invented to numeric time zone abbreviations for Afghanistan, American Samoa, the Azores, Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, - Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, Dubai, East - Timor, Eucla, Fiji, French Polynesia, Greenland, Indochina, Iran, - Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, the Maldives, - Marshall Is, Micronesia, Mongolia, Myanmar, Nauru, Nepal, New - Caledonia, Niue, Norfolk I, Palau, Papua New Guinea, the - Philippines, Pitcairn, Qatar, St Pierre & Miquelon, Samoa, Saudi - Arabia, Singapore, Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, - Wallis & Futuna, and Xinjiang; for half-hour daylight saving time - in Belize before 1944 and in the Dominican Republic before 1975; - and for Canary Islands before 1946, for Madeira before 1967, for - Iceland before 1969, for Indian Summer Time before 1942, for - Indonesia before around 1964, for the Netherlands in 1937-9, for - Pakistan before 1971, and for Zaporozhye in 1880-1924. + Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, + Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, + Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, + the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, + Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, + Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St + Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, + Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and + Xinjiang; for 20-minute daylight saving time in Ghana before 1943; + for half-hour daylight saving time in Belize before 1944 and in + the Dominican Republic before 1975; and for Canary Islands before + 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for + Indian Summer Time before 1942, for Indonesia before around 1964, + for Kenya before 1960, for Liberia before 1973, for Madeira before + 1967, for Namibia before 1943, for the Netherlands in 1937-9, for + Pakistan before 1971, for Western Sahara before 1977, and for + Zaporozhye in 1880-1924. For Alaska time from 1900 through 1967, instead of "CAT" use the abbreviation "AST", the abbreviation commonly used at the time diff --git a/africa b/africa index 010050e..2faeb27 100644 --- a/africa +++ b/africa @@ -6,7 +6,7 @@ # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. -# From Paul Eggert (2017-02-10): +# From Paul Eggert (2017-02-20): # # Unless otherwise specified, the source for data through 1990 is: # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), @@ -31,39 +31,33 @@ # A reliable and entertaining source about time zones is # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). # +# European-style abbreviations are commonly used along the Mediterranean. +# For sub-Saharan Africa abbreviations were less standardized. # Previous editions of this database used WAT, CAT, SAT, and EAT -# for +0:00 through +3:00, respectively, -# but Mark R V Murray reports that -# 'SAST' is the official abbreviation for +2:00 in the country of South Africa, -# 'CAT' is commonly used for +2:00 in countries north of South Africa, and -# 'WAT' is probably the best name for +1:00, as the common phrase for +# for UT +00 through +03, respectively, +# but in 1997 Mark R V Murray reported that +# 'SAST' is the official abbreviation for +02 in the country of South Africa, +# 'CAT' is commonly used for +02 in countries north of South Africa, and +# 'WAT' is probably the best name for +01, as the common phrase for # the area that includes Nigeria is "West Africa". -# He has heard of "Western Sahara Time" for +0:00 but can find no reference. -# -# To make things confusing, 'WAT' seems to have been used for -1:00 long ago; -# I'd guess that this was because people needed _some_ name for -1:00, -# and at the time, far west Africa was the only major land area in -1:00. -# This usage is now obsolete, as the last use of -1:00 on the African -# mainland seems to have been 1976 in Western Sahara. -# -# To summarize, the following abbreviations seem to have some currency: -# -1:00 WAT West Africa Time (no longer used) -# 0:00 GMT Greenwich Mean Time -# 2:00 CAT Central Africa Time -# 2:00 SAST South Africa Standard Time -# and Murray suggests the following abbreviation: -# 1:00 WAT West Africa Time -# I realize that this leads to 'WAT' being used for both -1:00 and 1:00 -# for times before 1976, but this is the best I can think of -# until we get more information. +# +# To summarize, the following abbreviations seemed to have some currency: +# +00 GMT Greenwich Mean Time +# +02 CAT Central Africa Time +# +02 SAST South Africa Standard Time +# and Murray suggested the following abbreviation: +# +01 WAT West Africa Time +# Murray's suggestion seems to have caught on in news reports and the like. +# I vaguely recall 'WAT' also being used for -01 in the past but +# cannot now come up with solid citations. # # I invented the following abbreviations; corrections are welcome! -# 2:00 WAST West Africa Summer Time -# 2:30 BEAT British East Africa Time (no longer used) -# 2:45 BEAUT British East Africa Unified Time (no longer used) -# 3:00 CAST Central Africa Summer Time (no longer used) -# 3:00 SAST South Africa Summer Time (no longer used) -# 3:00 EAT East Africa Time +# +02 WAST West Africa Summer Time +# +03 CAST Central Africa Summer Time (no longer used) +# +03 SAST South Africa Summer Time (no longer used) +# +03 EAT East Africa Time +# 'EAT' also seems to have caught on; the others are rare but are paired +# with better-attested non-DST abbreviations. # Algeria # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S @@ -121,17 +115,17 @@ Zone Africa/Algiers 0:12:12 - LMT 1891 Mar 15 0:01 # Cape Verde / Cabo Verde # -# Shanks gives 1907 for the transition to CVT. +# Shanks gives 1907 for the transition to +02. # Perhaps the 1911-05-26 Portuguese decree -# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf +# https://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf # merely made it official? # # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Atlantic/Cape_Verde -1:34:04 - LMT 1907 # Praia - -2:00 - CVT 1942 Sep - -2:00 1:00 CVST 1945 Oct 15 - -2:00 - CVT 1975 Nov 25 2:00 - -1:00 - CVT + -2:00 - -02 1942 Sep + -2:00 1:00 -01 1945 Oct 15 + -2:00 - -02 1975 Nov 25 2:00 + -1:00 - -01 # Central African Republic # See Africa/Lagos. @@ -388,7 +382,7 @@ Rule Ghana 1920 1942 - Sep 1 0:00 0:20 GHST Rule Ghana 1920 1942 - Dec 31 0:00 0 GMT # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Accra -0:00:52 - LMT 1918 - 0:00 Ghana %s + 0:00 Ghana GMT/+0020 # Guinea # See Africa/Abidjan. @@ -397,20 +391,20 @@ Zone Africa/Accra -0:00:52 - LMT 1918 # # Shanks gives 1911-05-26 for the transition to WAT, # evidently confusing the date of the Portuguese decree -# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf +# https://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf # with the date that it took effect, namely 1912-01-01. # # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Bissau -1:02:20 - LMT 1912 Jan 1 - -1:00 - WAT 1975 + -1:00 - -01 1975 0:00 - GMT # Kenya # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Nairobi 2:27:16 - LMT 1928 Jul 3:00 - EAT 1930 - 2:30 - BEAT 1940 - 2:45 - BEAUT 1960 + 2:30 - +0230 1940 + 2:45 - +0245 1960 3:00 - EAT Link Africa/Nairobi Africa/Addis_Ababa # Ethiopia Link Africa/Nairobi Africa/Asmara # Eritrea @@ -437,7 +431,7 @@ Link Africa/Nairobi Indian/Mayotte # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Monrovia -0:43:08 - LMT 1882 -0:43:08 - MMT 1919 Mar # Monrovia Mean Time - -0:44:30 - LRT 1972 May # Liberia Time + -0:44:30 - -004430 1972 May 0:00 - GMT ############################################################################### @@ -596,7 +590,7 @@ Rule Mauritius 2008 only - Oct lastSun 2:00 1:00 S Rule Mauritius 2009 only - Mar lastSun 2:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Indian/Mauritius 3:50:00 - LMT 1907 # Port Louis - 4:00 Mauritius MU%sT # Mauritius Time + 4:00 Mauritius +04/+05 # Agalega Is, Rodriguez # no information; probably like Indian/Mauritius @@ -915,14 +909,14 @@ Zone Africa/Casablanca -0:30:20 - LMT 1913 Oct 26 # since most of it was then controlled by Morocco. Zone Africa/El_Aaiun -0:52:48 - LMT 1934 Jan # El Aaiún - -1:00 - WAT 1976 Apr 14 + -1:00 - -01 1976 Apr 14 0:00 Morocco WE%sT # Mozambique # # Shanks gives 1903-03-01 for the transition to CAT. # Perhaps the 1911-05-26 Portuguese decree -# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf +# https://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf # merely made it official? # # Zone NAME GMTOFF RULES FORMAT [UNTIL] @@ -958,7 +952,7 @@ Rule Namibia 1994 max - Sep Sun>=1 2:00 1:00 S Rule Namibia 1995 max - Apr Sun>=1 2:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Windhoek 1:08:24 - LMT 1892 Feb 8 - 1:30 - SWAT 1903 Mar # SW Africa Time + 1:30 - +0130 1903 Mar 2:00 - SAST 1942 Sep 20 2:00 2:00 1:00 SAST 1943 Mar 21 2:00 2:00 - SAST 1990 Mar 21 # independence @@ -985,7 +979,7 @@ Link Africa/Lagos Africa/Porto-Novo # Benin # Réunion # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Indian/Reunion 3:41:52 - LMT 1911 Jun # Saint-Denis - 4:00 - RET # Réunion Time + 4:00 - +04 # # Crozet Islands also observes Réunion time; see the 'antarctica' file. # @@ -1020,7 +1014,7 @@ Zone Indian/Reunion 3:41:52 - LMT 1911 Jun # Saint-Denis # Seychelles # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Indian/Mahe 3:41:48 - LMT 1906 Jun # Victoria - 4:00 - SCT # Seychelles Time + 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 diff --git a/backzone b/backzone index 4a5085f..119584a 100644 --- a/backzone +++ b/backzone @@ -65,7 +65,7 @@ Link Africa/Asmara Africa/Asmera # Mali (southern) Zone Africa/Bamako -0:32:00 - LMT 1912 0:00 - GMT 1934 Feb 26 - -1:00 - WAT 1960 Jun 20 + -1:00 - -01 1960 Jun 20 0:00 - GMT # Central African Republic @@ -75,7 +75,7 @@ Zone Africa/Bangui 1:14:20 - LMT 1912 # Gambia Zone Africa/Banjul -1:06:36 - LMT 1912 -1:06:36 - BMT 1935 # Banjul Mean Time - -1:00 - WAT 1964 + -1:00 - -01 1964 0:00 - GMT # Malawi @@ -93,18 +93,18 @@ Zone Africa/Bujumbura 1:57:28 - LMT 1890 # Guinea Zone Africa/Conakry -0:54:52 - LMT 1912 0:00 - GMT 1934 Feb 26 - -1:00 - WAT 1960 + -1:00 - -01 1960 0:00 - GMT # Senegal Zone Africa/Dakar -1:09:44 - LMT 1912 - -1:00 - WAT 1941 Jun + -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 - BEAUT 1961 + 2:45 - +0245 1961 3:00 - EAT # Djibouti @@ -122,9 +122,9 @@ Zone Africa/Douala 0:38:48 - LMT 1912 # 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 TYPE IN ON AT SAVE LETTER/S -Rule SL 1935 1942 - Jun 1 0:00 0:40 SLST -Rule SL 1935 1942 - Oct 1 0:00 0 WAT -Rule SL 1957 1962 - Jun 1 0:00 1:00 SLST +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 @@ -153,8 +153,8 @@ Zone Africa/Juba 2:06:24 - LMT 1931 # Uganda Zone Africa/Kampala 2:09:40 - LMT 1928 Jul 3:00 - EAT 1930 - 2:30 - BEAT 1948 - 2:45 - BEAUT 1957 + 2:30 - +0230 1948 + 2:45 - +0245 1957 3:00 - EAT # Rwanda @@ -177,11 +177,11 @@ Zone Africa/Lome 0:04:52 - LMT 1893 # # Shanks gives 1911-05-26 for the transition to WAT, # evidently confusing the date of the Portuguese decree -# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf +# https://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf # with the date that it took effect, namely 1912-01-01. # Zone Africa/Luanda 0:52:56 - LMT 1892 - 0:52:04 - AOT 1912 Jan 1 # Angola Time + 0:52:04 - +005204 1912 Jan 1 1:00 - WAT # Democratic Republic of the Congo (east) @@ -216,19 +216,19 @@ Zone Africa/Mbabane 2:04:24 - LMT 1903 Mar # Somalia Zone Africa/Mogadishu 3:01:28 - LMT 1893 Nov 3:00 - EAT 1931 - 2:30 - BEAT 1957 + 2:30 - +0230 1957 3:00 - EAT # Niger Zone Africa/Niamey 0:08:28 - LMT 1912 - -1:00 - WAT 1934 Feb 26 + -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 - WAT 1960 Nov 28 + -1:00 - -01 1960 Nov 28 0:00 - GMT # Burkina Faso @@ -264,19 +264,19 @@ Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 # 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 - ART 1930 Dec - -4:00 Arg AR%sT 1969 Oct 5 - -3:00 Arg AR%sT 1991 Mar 3 - -4:00 - WART 1991 Oct 20 - -3:00 Arg AR%sT 1999 Oct 3 - -4:00 Arg AR%sT 2000 Mar 3 - -3:00 - ART 2004 Jun 1 - -4:00 - WART 2004 Jun 20 - -3:00 - ART + -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 - ANT 1965 # Netherlands Antilles Time + -4:30 - -0430 1965 -4:00 - AST # Cayman Is @@ -365,12 +365,12 @@ Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill # Formosa (FM), La Pampa (LP), Chubut (CH) Zone America/Rosario -4:02:40 - LMT 1894 Nov -4:16:44 - CMT 1920 May - -4:00 - ART 1930 Dec - -4:00 Arg AR%sT 1969 Oct 5 - -3:00 Arg AR%sT 1991 Jul - -3:00 - ART 1999 Oct 3 0:00 - -4:00 Arg AR%sT 2000 Mar 3 0:00 - -3:00 - ART + -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 @@ -403,12 +403,12 @@ Link Antarctica/McMurdo Antarctica/South_Pole # 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 - AST + 3:00 - +03 # Bahrain Zone Asia/Bahrain 3:22:20 - LMT 1920 # Manamah - 4:00 - GST 1972 Jun - 3:00 - AST + 4:00 - +04 1972 Jun + 3:00 - +03 # India # @@ -431,7 +431,7 @@ Zone Asia/Bahrain 3:22:20 - LMT 1920 # Manamah # 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 - LONT 1980 May # Long-shu Time + 7:00 - +07 1980 May 8:00 PRC C%sT Link Asia/Chongqing Asia/Chungking @@ -442,43 +442,43 @@ Link Asia/Chongqing Asia/Chungking # 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 - ICT 1942 Dec 31 23:00 - 8:00 - IDT 1945 Mar 14 23:00 - 9:00 - JST 1945 Sep 2 - 7:00 - ICT 1947 Apr 1 - 8:00 - IDT 1954 Oct - 7:00 - ICT + 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 - CHAT 1932 Mar # Changbai Time + 8:30 - +0830 1932 Mar 8:00 - CST 1940 - 9:00 - CHAT 1966 May - 8:30 - CHAT 1980 May + 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 - KAST 1940 # Kashgar Time - 5:00 - KAST 1980 May + 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 - AST + 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 - GST + 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) -# http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf +# 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] @@ -491,12 +491,12 @@ Zone Asia/Muscat 3:54:24 - LMT 1920 # transitions there. Zone Asia/Phnom_Penh 6:59:40 - LMT 1906 Jul 1 7:06:30 - PLMT 1911 May 1 - 7:00 - ICT 1942 Dec 31 23:00 - 8:00 - IDT 1945 Mar 14 23:00 - 9:00 - JST 1945 Sep 2 - 7:00 - ICT 1947 Apr 1 - 8:00 - IDT 1953 Nov 9 - 7:00 - ICT + 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 1953 Nov 9 + 7:00 - +07 # Israel Zone Asia/Tel_Aviv 2:19:04 - LMT 1880 @@ -511,16 +511,16 @@ Zone Asia/Tel_Aviv 2:19:04 - LMT 1880 # 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 - ICT 1942 Dec 31 23:00 - 8:00 - IDT 1945 Mar 14 23:00 - 9:00 - JST 1945 Sep 2 - 7:00 - ICT 1947 Apr 1 - 8:00 - IDT 1955 Apr 15 - 7:00 - ICT + 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 - EGT +Zone Atlantic/Jan_Mayen -1:00 - -01 # St Helena Zone Atlantic/St_Helena -0:22:48 - LMT 1890 # Jamestown @@ -663,15 +663,13 @@ Zone Pacific/Johnston -10:00 - HST # " 3:00P Ar. MIDWAY ISLAND . . . . . . . . . M.L.T. Lv. 6:00A " # Zone Pacific/Midway -11:49:28 - LMT 1901 - -11:00 - NST 1956 Jun 3 - -11:00 1:00 NDT 1956 Sep 2 - -11:00 - NST 1967 Apr # N=Nome - -11:00 - BST 1983 Nov 30 # B=Bering - -11:00 - SST # S=Samoa + -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 - MPT 1969 Oct # N Mariana Is Time - 10:00 - MPT 2000 Dec 23 + 9:00 - +09 1969 Oct + 10:00 - +10 2000 Dec 23 10:00 - ChST # Chamorro Standard Time -- 2.9.3

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ID string in zic's output files
by Arthur David Olson Feb. 22, 2017

Feb. 22, 2017

So much for the idea of storing ID strings in zic output files as (unused) abbreviations. The zone America/Pangnirtung needs 41 bytes to store all the abbreviations it uses: -00 AWT APT AST ADDT ADT EDT EST CST CDT A zic output file can have at most 50 bytes of abbreviations, as set by TZ_MAX_CHARS in tzfile.h The 9 bytes remaining isn't enough for our purposes. (We don't want to boost TZ_MAX_CHARS; localtime.c checks files to ensure they have at most that many abbreviation characters; files with more would be rejected, at least by now-in-the-field binaries compiled from localtime.c) Note that the last component of "Zone" names (such as the "Vevay" in "America/Indiana/Vevay") would fit in the 15 "reserved for future use" bytes at the front of zic output files; full names would not (always) fit, and there would not (always) be room for a prefix such as "@(#)." @dashdashado

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Spaniards’ lack of sleep isn’t a cultural thing – they’re in the wrong time zone
by BASTIAN Michelle Feb. 22, 2017

Feb. 22, 2017

Interesting article in the Guardian on proposed time zone changes in Spain. https://www.theguardian.com/commentisfree/2017/feb/22/spaniards-sleep-time-… --- Dr Michelle Bastian Chancellor’s Fellow, Edinburgh School of Architecture and Landscape Architecture Edinburgh College of Art, University of Edinburgh Level 1, Room 303B The Maltings 20-22 Chambers Street, Edinburgh, EH1 1JZ Phone: +44 (0)131 651 5779 Email: michelle.bastian(a)ed.ac.uk Website: www.michellebastian.net -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.

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[PROPOSED] Mongolia no longer observes DST
by Paul Eggert Feb. 16, 2017

Feb. 16, 2017

* NEWS: Mention this. * asia (Mongolia): DST expires after 2016. --- NEWS | 2 ++ asia | 8 ++++++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index 10c2cd4..3179d57 100644 --- a/NEWS +++ b/NEWS @@ -6,6 +6,8 @@ Unreleased, experimental changes Changes to future time stamps + Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) + Chile's Region of Magallanes moves from -04/-03 to -03 year-round. Its clocks diverge from America/Santiago starting 2017-05-13 at 23:00, hiving off a new zone America/Punta_Arenas. Although the diff --git a/asia b/asia index 26b6a5b..35774c6 100644 --- a/asia +++ b/asia @@ -2137,14 +2137,18 @@ Rule Mongol 1983 only - Oct 1 0:00 0 - # correction of 02:00 (in the previous edition) not being done correctly # in the latest edition; so ignore it for now. +# From Ganbold Tsagaankhuu (2017-02-09): +# Mongolian Government meeting has concluded today to cancel daylight +# saving time adoption in Mongolia. Source: http://zasag.mn/news/view/16192 + Rule Mongol 1985 1998 - Mar lastSun 0:00 1:00 S Rule Mongol 1984 1998 - Sep lastSun 0:00 0 - # IATA SSIM (1999-09) says Mongolia no longer observes DST. Rule Mongol 2001 only - Apr lastSat 2:00 1:00 S Rule Mongol 2001 2006 - Sep lastSat 2:00 0 - Rule Mongol 2002 2006 - Mar lastSat 2:00 1:00 S -Rule Mongol 2015 max - Mar lastSat 2:00 1:00 S -Rule Mongol 2015 max - Sep lastSat 0:00 0 - +Rule Mongol 2015 2016 - Mar lastSat 2:00 1:00 S +Rule Mongol 2015 2016 - Sep lastSat 0:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] # Hovd, a.k.a. Chovd, Dund-Us, Dzhargalant, Khovd, Jirgalanta -- 2.9.3

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New NIST leap-seconds.list
by Tony Finch Feb. 16, 2017

Feb. 16, 2017

The file at ftp://time.nist.gov/pub/leap-seconds.list has been updated to reflect Bulletin C53 and now has an expiry date of 28 December 2017. Tony. -- f.anthony.n.finch <dot(a)dotat.at> http://dotat.at/ - I xn--zr8h punycode Fair Isle: Cyclonic becoming northwest 5 or 6, then variable 4 later. Moderate, occasionally slight. Showers until later. Moderate or good.

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Bad Map Projection #79
by Guy Harris Feb. 15, 2017

Feb. 15, 2017

https://xkcd.com/1799/ "Where each country *should* be, based on its time zone(s)"

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[PROPOSED 1/3] Remove many invented abbreviations in 'australasia'
by Paul Eggert Feb. 14, 2017

Feb. 14, 2017

* NEWS: Document this. * australasia (Australia/Eucla, Australia/Lord_Howe) (Antarctica/Macquarie, Indian/Christmas, Indian/Cocos, Pacific/Fiji) (Pacific/Gambier, Pacific/Marquesas, Pacific/Tahiti, Pacific/Tarawa) (Pacific/Enderbury, Pacific/Kiritimati, Pacific/Majuro) (Pacific/Kwajalein, Pacific/Chuuk, Pacific/Pohnpei, Pacific/Kosrae) (Pacific/Nauru, Pacific/Noumea, Pacific/Chatham, Pacific/Rarotonga) (Pacific/Niue, Pacific/Norfolk, Pacific/Palau, Pacific/Port_Moresby) (Pacific/Bougainville, Pacific/Pitcairn, Pacific/Pago_Pago) (Pacific/Apia, Pacific/Guadalcanal, Pacific/Fakaofo, Pacific/Funafuti): (Pacific/Wake, Pacific/Efate, Pacific/Wallis): Use numeric time zone abbreviations instead of invented ones, for time zones with UT offsets that are integer minutes. --- NEWS | 15 ++++-- australasia | 148 ++++++++++++++++++++++++++++-------------------------------- 2 files changed, 79 insertions(+), 84 deletions(-) diff --git a/NEWS b/NEWS index 3179d57..23bcd8f 100644 --- a/NEWS +++ b/NEWS @@ -37,11 +37,16 @@ Unreleased, experimental changes part of the ongoing project of removing invented abbreviations. This avoids the need to invent an abbreviation for the new Chilean new zone. Similarly, switch from invented to numeric time zone - abbreviations for Afghanistan, the Azores, Bangladesh, Bhutan, the - British Indian Ocean Territory, Brunei, Dubai, East Timor, - Greenland, Indochina, Iran, Iraq, Malaysia, the Maldives, - Mongolia, Myanmar, Nepal, the Philippines, Qatar, St Pierre and - Miquelon, Saudi Arabia, Singapore, and Xinjiang; for half-hour DST + abbreviations for Afghanistan, American Samoa, the Azores, + Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, + Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, Dubai, East + Timor, Eucla, Fiji, French Polynesia, Greenland, Indochina, Iran, + Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, the Maldives, + Marshall Is, Micronesia, Mongolia, Myanmar, Nauru, Nepal, New + Caledonia, Niue, Norfolk I, Palau, Papua New Guinea, the + Philippines, Pitcairn, Qatar, St Pierre & Miquelon, Samoa, Saudi + Arabia, Singapore, Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, + Wallis & Futuna, and Xinjiang; for half-hour daylight saving time in Belize before 1944 and in the Dominican Republic before 1975; and for Canary Islands before 1946, for Madeira before 1967, for Iceland before 1969, for Indian Summer Time before 1942, for diff --git a/australasia b/australasia index 0bca53e..1280022 100644 --- a/australasia +++ b/australasia @@ -44,8 +44,8 @@ Zone Australia/Perth 7:43:24 - LMT 1895 Dec 8:00 Aus AW%sT 1943 Jul 8:00 AW AW%sT Zone Australia/Eucla 8:35:28 - LMT 1895 Dec - 8:45 Aus ACW%sT 1943 Jul - 8:45 AW ACW%sT + 8:45 Aus +0845/+0945 1943 Jul + 8:45 AW +0845/+0945 # Queensland # @@ -212,7 +212,8 @@ Rule LH 2008 max - Apr Sun>=1 2:00 0 S Rule LH 2008 max - Oct Sun>=1 2:00 0:30 D Zone Australia/Lord_Howe 10:36:20 - LMT 1895 Feb 10:00 - AEST 1981 Mar - 10:30 LH LH%sT + 10:30 LH +1030/+1130 1985 Jul + 10:30 LH +1030/+11 # Australian miscellany # @@ -250,19 +251,19 @@ Zone Antarctica/Macquarie 0 - -00 1899 Nov 0 - -00 1948 Mar 25 10:00 Aus AE%sT 1967 10:00 AT AE%sT 2010 Apr 4 3:00 - 11:00 - MIST # Macquarie I Standard Time + 11:00 - +11 # Christmas # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Indian/Christmas 7:02:52 - LMT 1895 Feb - 7:00 - CXT # Christmas Island Time + 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 NAME GMTOFF RULES FORMAT [UNTIL] Zone Indian/Cocos 6:27:40 - LMT 1900 - 6:30 - CCT # Cocos Islands Time + 6:30 - +0630 # Fiji @@ -375,16 +376,16 @@ Rule Fiji 2014 max - Nov Sun>=1 2:00 1:00 S Rule Fiji 2015 max - Jan Sun>=15 3:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Fiji 11:55:44 - LMT 1915 Oct 26 # Suva - 12:00 Fiji FJ%sT # Fiji Time + 12:00 Fiji +12/+13 # French Polynesia # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Gambier -8:59:48 - LMT 1912 Oct # Rikitea - -9:00 - GAMT # Gambier Time + -9:00 - -09 Zone Pacific/Marquesas -9:18:00 - LMT 1912 Oct - -9:30 - MART # Marquesas Time + -9:30 - -0930 Zone Pacific/Tahiti -9:58:16 - LMT 1912 Oct # Papeete - -10:00 - TAHT # Tahiti Time + -10:00 - -10 # Clipperton (near North America) is administered from French Polynesia; # it is uninhabited. @@ -399,15 +400,15 @@ Link Pacific/Guam Pacific/Saipan # N Mariana Is # Kiribati # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Tarawa 11:32:04 - LMT 1901 # Bairiki - 12:00 - GILT # Gilbert Is Time + 12:00 - +12 Zone Pacific/Enderbury -11:24:20 - LMT 1901 - -12:00 - PHOT 1979 Oct # Phoenix Is Time - -11:00 - PHOT 1995 - 13:00 - PHOT + -12:00 - -12 1979 Oct + -11:00 - -11 1995 + 13:00 - +13 Zone Pacific/Kiritimati -10:29:20 - LMT 1901 - -10:40 - LINT 1979 Oct # Line Is Time - -10:00 - LINT 1995 - 14:00 - LINT + -10:40 - -1040 1979 Oct + -10:00 - -10 1995 + 14:00 - +14 # N Mariana Is # See Pacific/Guam. @@ -415,31 +416,31 @@ Zone Pacific/Kiritimati -10:29:20 - LMT 1901 # Marshall Is # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Majuro 11:24:48 - LMT 1901 - 11:00 - MHT 1969 Oct # Marshall Islands Time - 12:00 - MHT + 11:00 - +11 1969 Oct + 12:00 - +12 Zone Pacific/Kwajalein 11:09:20 - LMT 1901 - 11:00 - MHT 1969 Oct - -12:00 - KWAT 1993 Aug 20 # Kwajalein Time - 12:00 - MHT + 11:00 - +11 1969 Oct + -12:00 - -12 1993 Aug 20 + 12:00 - +12 # Micronesia # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Chuuk 10:07:08 - LMT 1901 - 10:00 - CHUT # Chuuk Time + 10:00 - +10 Zone Pacific/Pohnpei 10:32:52 - LMT 1901 # Kolonia - 11:00 - PONT # Pohnpei Time + 11:00 - +11 Zone Pacific/Kosrae 10:51:56 - LMT 1901 - 11:00 - KOST 1969 Oct # Kosrae Time - 12:00 - KOST 1999 - 11:00 - KOST + 11:00 - +11 1969 Oct + 12:00 - +12 1999 + 11:00 - +11 # Nauru # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Nauru 11:07:40 - LMT 1921 Jan 15 # Uaobe - 11:30 - NRT 1942 Mar 15 # Nauru Time - 9:00 - JST 1944 Aug 15 - 11:30 - NRT 1979 May - 12:00 - NRT + 11:30 - +1130 1942 Mar 15 + 9:00 - +09 1944 Aug 15 + 11:30 - +1130 1979 May + 12:00 - +12 # New Caledonia # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S @@ -450,7 +451,7 @@ Rule NC 1996 only - Dec 1 2:00s 1:00 S Rule NC 1997 only - Mar 2 2:00s 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Noumea 11:05:48 - LMT 1912 Jan 13 # Nouméa - 11:00 NC NC%sT + 11:00 NC +11/+12 ############################################################################### @@ -491,8 +492,8 @@ Zone Pacific/Auckland 11:39:04 - LMT 1868 Nov 2 11:30 NZ NZ%sT 1946 Jan 1 12:00 NZ NZ%sT Zone Pacific/Chatham 12:13:48 - LMT 1868 Nov 2 - 12:15 - CHAST 1946 Jan 1 - 12:45 Chatham CHA%sT + 12:15 - +1215 1946 Jan 1 + 12:45 Chatham +1245/+1345 Link Pacific/Auckland Antarctica/McMurdo @@ -514,8 +515,8 @@ Rule Cook 1979 1991 - Mar Sun>=1 0:00 0 - Rule Cook 1979 1990 - Oct lastSun 0:00 0:30 HS # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Rarotonga -10:39:04 - LMT 1901 # Avarua - -10:30 - CKT 1978 Nov 12 # Cook Is Time - -10:00 Cook CK%sT + -10:30 - -1030 1978 Nov 12 + -10:00 Cook -10/-0930 ############################################################################### @@ -523,29 +524,29 @@ Zone Pacific/Rarotonga -10:39:04 - LMT 1901 # Avarua # Niue # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Niue -11:19:40 - LMT 1901 # Alofi - -11:20 - NUT 1951 # Niue Time - -11:30 - NUT 1978 Oct 1 - -11:00 - NUT + -11:20 - -1120 1951 + -11:30 - -1130 1978 Oct 1 + -11:00 - -11 # Norfolk # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Norfolk 11:11:52 - LMT 1901 # Kingston - 11:12 - NMT 1951 # Norfolk Mean Time - 11:30 - NFT 1974 Oct 27 02:00 # Norfolk T. - 11:30 1:00 NFST 1975 Mar 2 02:00 - 11:30 - NFT 2015 Oct 4 02:00 - 11:00 - NFT + 11:12 - +1112 1951 + 11:30 - +1130 1974 Oct 27 02:00 + 11:30 1:00 +1230 1975 Mar 2 02:00 + 11:30 - +1130 2015 Oct 4 02:00 + 11:00 - +11 # Palau (Belau) # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Palau 8:57:56 - LMT 1901 # Koror - 9:00 - PWT # Palau Time + 9:00 - +09 # Papua New Guinea # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Port_Moresby 9:48:40 - LMT 1880 9:48:32 - PMMT 1895 # Port Moresby Mean Time - 10:00 - PGT # Papua New Guinea Time + 10:00 - +10 # # From Paul Eggert (2014-10-13): # Base the Bougainville entry on the Arawa-Kieta region, which appears to have @@ -560,28 +561,26 @@ Zone Pacific/Port_Moresby 9:48:40 - LMT 1880 # and seem to have controlled it until their 1945-08-21 surrender. # # The Autonomous Region of Bougainville switched from UT +10 to +11 -# on 2014-12-28 at 02:00. They call +11 "Bougainville Standard Time"; -# abbreviate this as BST. See: +# on 2014-12-28 at 02:00. They call +11 "Bougainville Standard Time". +# See: # http://www.bougainville24.com/bougainville-issues/bougainville-gets-own-tim… # Zone Pacific/Bougainville 10:22:16 - LMT 1880 9:48:32 - PMMT 1895 - 10:00 - PGT 1942 Jul - 9:00 - JST 1945 Aug 21 - 10:00 - PGT 2014 Dec 28 2:00 - 11:00 - BST + 10:00 - +10 1942 Jul + 9:00 - +09 1945 Aug 21 + 10:00 - +10 2014 Dec 28 2:00 + 11:00 - +11 # Pitcairn # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Pitcairn -8:40:20 - LMT 1901 # Adamstown - -8:30 - PNT 1998 Apr 27 0:00 - -8:00 - PST # Pitcairn Standard Time + -8:30 - -0830 1998 Apr 27 0:00 + -8:00 - -08 # American Samoa Zone Pacific/Pago_Pago 12:37:12 - LMT 1879 Jul 5 -11:22:48 - LMT 1911 - -11:00 - NST 1967 Apr # N=Nome - -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa Link Pacific/Pago_Pago Pacific/Midway # in US minor outlying islands @@ -662,17 +661,17 @@ Rule WS 2012 max - Sep lastSun 3:00 1 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Apia 12:33:04 - LMT 1879 Jul 5 -11:26:56 - LMT 1911 - -11:30 - WSST 1950 - -11:00 WS S%sT 2011 Dec 29 24:00 # S=Samoa - 13:00 WS WS%sT + -11:30 - -1130 1950 + -11:00 WS -11/-10 2011 Dec 29 24:00 + 13:00 WS +13/+14 # Solomon Is # excludes Bougainville, for which see Papua New Guinea # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct # Honiara - 11:00 - SBT # Solomon Is Time + 11:00 - +11 -# Tokelau Is +# Tokelau # # From Gwillim Law (2011-12-29) # A correspondent informed me that Tokelau, like Samoa, will be skipping @@ -693,8 +692,8 @@ Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct # Honiara # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Fakaofo -11:24:56 - LMT 1901 - -11:00 - TKT 2011 Dec 30 # Tokelau Time - 13:00 - TKT + -11:00 - -11 2011 Dec 30 + 13:00 - +13 # Tonga # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S @@ -713,7 +712,7 @@ Zone Pacific/Tongatapu 12:19:20 - LMT 1901 # Tuvalu # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Funafuti 11:56:52 - LMT 1901 - 12:00 - TVT # Tuvalu Time + 12:00 - +12 # US minor outlying islands @@ -775,7 +774,7 @@ Zone Pacific/Funafuti 11:56:52 - LMT 1901 # Wake # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Wake 11:06:28 - LMT 1901 - 12:00 - WAKT # Wake Time + 12:00 - +12 # Vanuatu @@ -788,12 +787,12 @@ Rule Vanuatu 1992 1993 - Jan Sun>=23 0:00 0 - Rule Vanuatu 1992 only - Oct Sun>=23 0:00 1:00 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Efate 11:13:16 - LMT 1912 Jan 13 # Vila - 11:00 Vanuatu VU%sT # Vanuatu Time + 11:00 Vanuatu +11/+12 # Wallis and Futuna # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Wallis 12:15:20 - LMT 1901 - 12:00 - WFT # Wallis & Futuna Time + 12:00 - +12 ############################################################################### @@ -804,7 +803,7 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # tz(a)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): +# From Paul Eggert (2017-02-10): # # Unless otherwise specified, the source for data through 1990 is: # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), @@ -829,28 +828,19 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # A reliable and entertaining source about time zones is # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). # -# I invented the abbreviations marked '*' in the following table; -# the rest are from earlier versions of this file, or from other sources. +# The following abbreviations are from other sources. # Corrections are welcome! # std dst # LMT Local Mean Time # 8:00 AWST AWDT Western Australia -# 8:45 ACWST ACWDT Central Western Australia* -# 9:00 JST Japan # 9:30 ACST ACDT Central Australia # 10:00 AEST AEDT Eastern Australia +# 10:00 GST Guam through 2000 # 10:00 ChST Chamorro -# 10:30 LHST LHDT Lord Howe* -# 11:00 BST Bougainville* # 11:30 NZMT NZST New Zealand through 1945 # 12:00 NZST NZDT New Zealand 1946-present -# 12:15 CHAST Chatham through 1945* -# 12:45 CHAST CHADT Chatham 1946-present* -# 13:00 WSST WSDT (western) Samoa 2011-present* -# -11:30 WSST Western Samoa through 1950* # -11:00 SST Samoa # -10:00 HST Hawaii -# - 8:00 PST Pitcairn* # # See the 'northamerica' file for Hawaii. # See the 'southamerica' file for Easter I and the Galápagos Is. -- 2.9.3

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tzid in zoneinfo?
by Steven R. Loomis Feb. 13, 2017

Feb. 13, 2017

Dear TZ list, I would like to propose that zic-compiled binaries (such as what shows up in /etc/zoneinfo) include the tzid (such as ‘America/New_York’). I work on the ICU project (Unicode’s International Components for Unicode) and also CLDR (Unicode’s Common Locale Data Repository). The ICU library consumes tz data, and uses the localized data from CLDR to (among other things) display translated time zone names of various sorts, and format different types of dates. A perpetual problem is trying to detect the actual timezone of a platform. Ideally something like the TZ variable is set to a valid tz id such as America/New_York which we can use directly. Otherwise, we try various approaches - including trying to resolve /etc/localtime’s symlink to see if it points to a file which appears to be in some sort of zic-compiled tree. This brings up bugs such as http://bugs.icu-project.org/trac/ticket/12770 because various platforms use different paths as the targets of /etc/localtime - and some times, it's a doubly linked symlink. In other cases, the file is just copied, and we have to trawl through /usr/share/zoneinfo looking for a binary file which matches. There are other methods employed if these fail, but I think this will suffice for our purposes. Even if ICU consumed the /etc/zoneinfo file directly, or was able to call the host to perform the calculations it needs, that would not suffice in terms of localized content. As I think has been noted on this list before, it does not seem to be a goal of the tz database to collect these translated names, and tz-link.html does link to CLDR as one possible source of translations. I think that this would benefit other users as well, by making zone files self identifiable. I think the JDK has to do similar analysis. Some JavaScript containers (Mozilla especially) now support IANA tz ids, such as in https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Ob… Any thoughts or comments? Thanks, Steven

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Re: [tz] Version in zoneinfo files?
by Guy Harris Feb. 10, 2017

Feb. 10, 2017

On Oct 25, 2015, at 10:55 AM, Paul G <paul(a)ganssle.io> wrote: > I'm not suggesting that it be impossible to create a weird result when asking for the version, just that there's a standard place for the version to go, and preferably the standard default gives you something that you expected. I.e., something that works most of the time is sufficient? So what exactly is the intended use of this version field? > As it is now, you're virtually guaranteed to have a lot of incompatibility because there's nothing you can point to that says, "This is the canonical way to store version information about zoneinfo files", and no standard has emerged on how to do this as is. > > On 10/25/2015 01:51 PM, Guy Harris wrote: >> >> On Oct 25, 2015, at 10:37 AM, Paul G <paul(a)ganssle.io> wrote: >> >>> On 10/25/2015 01:35 PM, Guy Harris wrote: >>> >>>> So where would zic get the version information to put into the binary files? >>> >>> My understanding is that it's the VERSION= line of the Makefile in the tzdata tarballs. >> >> I.e., you're proposing that the value of the VERSION value in the Makefile be passed as an argument to zic, and zic would put the value of that argument into a field in the files? >> >> So, if the goal is to provide a "reliable way to get the version information in a cross-platform way", what would ensure that this field be set properly, for some value of "properly", everywhere that binary tzdata files are generated? >> >> I.e., what is to guarantee that >> >> 1) nobody downstream change VERSION if they aren't changing the zic files from what's distributed >> >> and >> >> 2) people change it "properly" if the files don't correspond to a particular version of files that were distributed (e.g., if some downstream supplier takes 2015q and adds some changes mentioned on the list to it before 2015r comes out with those changes plus other changes, they should call the resulting files something other than "2015q" or "2015r")? >> >

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