From 93a6941b4ba8e6ca1b5ef4b0094a1546d9e8669e Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Mon, 18 Dec 2023 23:27:30 -0800 Subject: [DRAFT] Vostok was at +07 and just switched to +05 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * NEWS: Mention this. * backzone (Antarctica/Vostok): Move from here ... * antarctica (Antarctica/Vostok): ... to here, with fixes from Zakhary V. Akulov. Also, record 1994 closure. * backward (Antarctica/Vostok): Remove Link, as it’s now a Zone. * zone1970.tab (Antarctica/Vostok): Copy entry from zone.tab. (Asia/Urumqi): No longer a standin for Vostok. --- NEWS | 6 ++++++ antarctica | 42 +++++++++++++++++++++++++++++++++++++++++- asia | 1 - backward | 1 - backzone | 29 ----------------------------- zone1970.tab | 3 ++- 6 files changed, 49 insertions(+), 33 deletions(-) diff --git a/NEWS b/NEWS index 43070aae..9910c9d2 100644 --- a/NEWS +++ b/NEWS @@ -4,6 +4,7 @@ Unreleased, experimental changes Briefly: Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. + Vostok, Antarctica fixes, including 2023-12-18 change. Code and data fixes for Palestine timestamps starting in 2072. A new data file zonenow.tab for timestamps starting now. @@ -19,6 +20,11 @@ Unreleased, experimental changes Fix predictions for DST transitions in Palestine in 2072-2075, correcting a typo introduced in 2023a. + Changes to past and future timestamps + + Vostok, Antarctica switched to +05 on 2023-12-18. It had been at + +07 (not +06) for many years. (Thanks to Zakhary V. Akulov.) + Changes to past tm_isdst flags Much of Greenland, represented by America/Nuuk, changed its diff --git a/antarctica b/antarctica index fc603e99..7e848c13 100644 --- a/antarctica +++ b/antarctica @@ -240,7 +240,47 @@ Zone Antarctica/Troll 0 - -00 2005 Feb 12 # year-round from 1960/61 to 1992 # Vostok, since 1957-12-16, temporarily closed 1994-02/1994-11 -# See Asia/Urumqi. +# 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. +# +# From Zakhary V. Akulov (2023-12-17 22:00:48 +0700): +# ... from December, 18, 2023 00:00 by my decision the local time of +# the Antarctic research base Vostok will correspond to UTC+5. +# (2023-12-19), in response to the question "Has local +# time at Vostok been UTC+6 ever since 1957, or has it changed before?": +# No. At least since my antarctic career start, 10 years ago, Vostok +# base has UTC+7. +# +# From Paul Eggert (2023-12-18): +# For lack of better info, guess Vostok was at +07 from founding through today, +# except when closed. + +# Zone NAME STDOFF RULES FORMAT [UNTIL] +Zone Antarctica/Vostok 0 - -00 1957 Dec 16 + 7:00 - +07 1994 Feb + 0 - -00 1994 Nov + 7:00 - +07 2023 Dec 18 + 5:00 - +05 # S Africa - year-round bases # Marion Island, -4653+03752 diff --git a/asia b/asia index 36d7b445..04526c19 100644 --- a/asia +++ b/asia @@ -655,7 +655,6 @@ Zone Asia/Shanghai 8:05:43 - LMT 1901 8:00 PRC C%sT # Xinjiang time, used by many in western China; represented by Ürümqi / Ürümchi # / Wulumuqi. (Please use Asia/Shanghai if you prefer Beijing time.) -# Vostok base in Antarctica matches this since 1970. Zone Asia/Urumqi 5:50:20 - LMT 1928 6:00 - +06 diff --git a/backward b/backward index 421f2ec6..65c711b3 100644 --- a/backward +++ b/backward @@ -205,7 +205,6 @@ Link America/Puerto_Rico America/Tortola Link Pacific/Port_Moresby Antarctica/DumontDUrville Link Pacific/Auckland Antarctica/McMurdo Link Asia/Riyadh Antarctica/Syowa -Link Asia/Urumqi Antarctica/Vostok Link Europe/Berlin Arctic/Longyearbyen Link Asia/Riyadh Asia/Aden Link Asia/Qatar Asia/Bahrain diff --git a/backzone b/backzone index 44d81c29..f4525034 100644 --- a/backzone +++ b/backzone @@ -963,35 +963,6 @@ Link Antarctica/McMurdo Antarctica/South_Pole 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. diff --git a/zone1970.tab b/zone1970.tab index c7dcc436..abd94897 100644 --- a/zone1970.tab +++ b/zone1970.tab @@ -47,6 +47,7 @@ AQ -6736+06253 Antarctica/Mawson Mawson AQ -6448-06406 Antarctica/Palmer Palmer AQ -6734-06808 Antarctica/Rothera Rothera AQ -720041+0023206 Antarctica/Troll Troll +AQ -7824+10654 Antarctica/Vostok Vostok AR -3436-05827 America/Argentina/Buenos_Aires Buenos Aires (BA, CF) AR -3124-06411 America/Argentina/Cordoba most areas: CB, CC, CN, ER, FM, MN, SE, SF AR -2447-06525 America/Argentina/Salta Salta (SA, LP, NQ, RN) @@ -126,7 +127,7 @@ CL -3327-07040 America/Santiago most of Chile CL -5309-07055 America/Punta_Arenas Region of Magallanes CL -2709-10926 Pacific/Easter Easter Island CN +3114+12128 Asia/Shanghai Beijing Time -CN,AQ +4348+08735 Asia/Urumqi Xinjiang Time, Vostok +CN +4348+08735 Asia/Urumqi Xinjiang Time CO +0436-07405 America/Bogota CR +0956-08405 America/Costa_Rica CU +2308-08222 America/Havana -- 2.40.1