November 2009 - tz - lists.iana.org

proposed tz change for Latvia, Lithuania
by Paul Eggert 25 May '15

25 May '15

It's March Madness time for daylight-saving rule changes. Here's a proposed change to the tz database to keep up with the latest political development, which affects time stamps starting March 29: * Latvia and Lithuania will not observe DST, starting this year. Thanks to Andrei Ivanov for this info. =================================================================== RCS file: RCS/europe,v retrieving revision 2000.3 retrieving revision 2000.3.0.1 diff -pu -r2000.3 -r2000.3.0.1 --- europe 2000/03/04 15:31:08 2000.3 +++ europe 2000/03/08 17:48:59 2000.3.0.1 @@ -1135,6 +1135,12 @@ Link Europe/Rome Europe/San_Marino # 1997-01-21 on transition to Summer time ... established the same order of # daylight savings time settings as in the States of the European Union. +# From Andrei Ivanov (2000-03-06): +# This year Latvia will not switch to Daylight Savings Time (as specified in +# <a href="http://www.lv-laiks.lv/wwwraksti/2000/071072/vd4.htm"> +# The Regulations of the Cabinet of Ministers of the Rep. of Latvia of +# 29-Feb-2000 (#79)</a>, in Latvian for subscribers only). + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Latvia 1989 1996 - Mar lastSun 2:00s 1:00 S Rule Latvia 1989 1996 - Sep lastSun 2:00s 0 - @@ -1151,7 +1157,8 @@ Zone Europe/Riga 1:36:24 - LMT 1880 3:00 Russia MSK/MSD 1989 Mar lastSun 2:00s 2:00 1:00 EEST 1989 Sep lastSun 2:00s 2:00 Latvia EE%sT 1997 Jan 21 - 2:00 EU EE%sT + 2:00 EU EE%sT 2000 Feb 29 + 2:00 - EET # Liechtenstein # Zone NAME GMTOFF RULES FORMAT [UNTIL] @@ -1178,6 +1185,11 @@ Zone Europe/Vaduz 0:38:04 - LMT 1894 Jun # motion to give up shifting to summer time in spring, as it was # already done by Estonia. +# From Andrei Ivanov (2000-03-06): +# I've heard that Ministers of three Baltic countries on their summit +# somewhere in February decided not to switch to summer time starting from +# this spring. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/Vilnius 1:41:16 - LMT 1880 1:24:00 - WMT 1917 # Warsaw Mean Time @@ -1192,7 +1204,8 @@ Zone Europe/Vilnius 1:41:16 - LMT 1880 2:00 C-Eur EE%sT 1998 2:00 - EET 1998 Mar 29 1:00u 1:00 EU CE%sT 1999 Oct 31 1:00u - 2:00 EU EE%sT + 2:00 EU EE%sT 2000 Feb + 2:00 - EET # Luxembourg # Whitman disagrees with most of these dates in minor ways; go with Shanks.

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corrected DST data Switzerland 1941 and 1942, final report
by Alois Treindl 25 Aug '11

25 Aug '11

Hello I have researched the DST usage in Switzerland during the 1940ies. As I wrote in an earlier message, I suspected the current tzdata values to be wrong. This is now verified. I have found copies of the original ruling by the Swiss Federal government, in 'Eidgenössische Gesetzessammlung 1941 and 1942' (Swiss federal law collection) and attach GIF copies of the two pages for 1941. DST began on Monday 5 May 1941, 1:00 am by shifting the clocks to 2:00 am DST ended on Monday 6 Oct 1941, 2:00 am by shifting the clocks to 1:00 am. DST began on Monday, 4 May 1942 at 01:00 am DST ended on Monday, 5 Oct 1942 at 02:00 am There was no DST in 1940, I have checked the law collection carefully. It is also indicated by the fact that the 1942 entry in the law collection points back to 1941 as a reference, but no reference to any other years are made. Newspaper articles I have read in the archives on 6 May 1941 reported about the introduction of DST (Sommerzeit in German) during the previous night as an absolute novelty, because this was the first time that such a thing had happened in Switzerland. I have also checked 1916, because one book source (Gabriel, Traite de l'heure dans le monde) claims that Switzerland had DST in 1916. This is false, no official document could be found. Probably Gabriel got misled by references to Germany, which introduced DST in 1916 for the first time. The tzdata rules for Switzerland must be changed to: Rule Swiss 1941 1942 - May Mon>=1 1:00 1:00 S Rule Swiss 1941 1942 - Oct Mon>=1 2:00 0 - The 1940 rules must be deleted. One further detail for Switzerland, which is probably out of scope for most users of tzdata: The zone file Zone Europe/Zurich 0:34:08 - LMT 1848 Sep 12 0:29:44 - BMT 1894 Jun #Bern Mean Time 1:00 Swiss CE%sT 1981 1:00 EU CE%sT describes all of Switzerland correctly, with the exception of the Cantone Geneve (Geneva, Genf). Between 1848 and 1894 Geneve did not follow Bern Mean Time but kept its own local mean time. To represent this, an extra zone would be needed. Two GIF files are attached. best regards Alois -- || Alois Treindl, Astrodienst AG, mailto:alois@astro.com || Zollikon/Zurich, Switzerland || Free astrological charts at http://www.astro.com/ || SWISS EPHEMERIS Free Edition at http://www.astro.com/swisseph/

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Can you add permatime.com to the twinsun link page
by Tim Diggins 19 May '11

19 May '11

Hi there - I've been lurking on the list for a while. I don't contribute much as a I'm a (humbly grateful) user of tz information, rather than a provider. I mentioned our http://permatime.com site, a while back, but don't think I explicitly asked for it to go on the twinsun link page under "Web pages using recent versions of the tz database". Can it? http://permatime.com is a service for generating and viewing links that refer to a particular point in time and can be displayed in multiple timezones. It uses the ruby tzinfo gem, based on the Olson Tz database. kind regards Tim http://permatime.com http://teamportfolios.com/permatime Tim Diggins http://red56.co.uk http://tim.teamportfolios.com/

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Tomsk wrong timezone
by Jesper Norgaard Welen 18 Feb '11

18 Feb '11

A quote from the 'europe' file: # Novosibirskaya oblast'. Zone Asia/Novosibirsk 5:31:40 - LMT 1919 Dec 14 6:00 6:00 - NOVT 1930 Jun 21 # Novosibirsk Time 7:00 Russia NOV%sT 1991 Mar 31 2:00s 6:00 Russia NOV%sT 1992 Jan 19 2:00s 7:00 Russia NOV%sT 1993 May 23 # say Shanks & P. 6:00 Russia NOV%sT # # From Oscar van Vlijmen (2001-08-25): [This region consists of] # Kemerovskaya oblast', Krasnoyarskij kraj, # Tajmyrskij (Dolgano-Nenetskij) avtonomnyj okrug, Tomskaya oblast', # Respublika Tuva, Respublika Khakasiya, Evenkijskij avtonomnyj okrug. Zone Asia/Krasnoyarsk 6:11:20 - LMT 1920 Jan 6 6:00 - KRAT 1930 Jun 21 # Krasnoyarsk Time 7:00 Russia KRA%sT 1991 Mar 31 2:00s 6:00 Russia KRA%sT 1992 Jan 19 2:00s 7:00 Russia KRA%sT In fact, it seems that Tomsk city and Tomskaya oblast' is part of the Novosibirsk timezone, see http://en.wikipedia.org/wiki/Tomskaya_Oblast%27%2C_Russia and http://www.admin.tomsk.ru/1024 ... the latter, if you don't understand russian, look at the time under the green horse. I don't know if this simply means that Tomskaya oblast' changed timezone since 2001, which is a possibility, that would then require a new timezone. Regards, - Jesper Jesper Nørgaard Welen Email: jnorgard(a)Prodigy.Net.mx Project Leader (Líder de Proyecto) Software CIMMYT - Centro Internacional de Mejoramiento de Maíz y Trigo Dirección: CIMMYT Int. c/o Jesper Nørgaard Km. 45, Carretera México-Veracruz El Batán Texcoco, Edo. de México CP 56130 MEXICO Tel.: +52 (55) 58-04-20-04 ext. 1374 Fax: +52 (55) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 Download the shareware program World Time Explorer, I made: http://www.worldtimeexplorer.com/index.html

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first pass at Uyghur time
by Arthur David Olson 29 Nov '09

29 Nov '09

Below find a first pass at changes to "zone.tabb" and "asia" to handle Uyghur variants of time in China. The basic approach is to have zones with Han-based names for the rules used by Han, and zones with Uyghur-based names for the rules used by Uyghur. --ado ------- zone.tab ------- *** /tmp/geta21843 Sat Nov 21 10:34:46 2009 --- /tmp/getb21843 Sat Nov 21 10:34:46 2009 *************** *** 1,5 **** # <pre> ! # @(#)zone.tab 8.29 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. # --- 1,5 ---- # <pre> ! # @(#)zone.tab 8.30 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. # *************** *** 148,155 **** CN +3114+12128 Asia/Shanghai east China - Beijing, Guangdong, Shanghai, etc. CN +4545+12641 Asia/Harbin Heilongjiang (except Mohe), Jilin CN +2934+10635 Asia/Chongqing central China - Sichuan, Yunnan, Guangxi, Shaanxi, Guizhou, etc. ! CN +4348+08735 Asia/Urumqi most of Tibet & Xinjiang ! CN +3929+07559 Asia/Kashgar west Tibet & Xinjiang CO +0436-07405 America/Bogota CR +0956-08405 America/Costa_Rica CU +2308-08222 America/Havana --- 148,157 ---- CN +3114+12128 Asia/Shanghai east China - Beijing, Guangdong, Shanghai, etc. CN +4545+12641 Asia/Harbin Heilongjiang (except Mohe), Jilin CN +2934+10635 Asia/Chongqing central China - Sichuan, Yunnan, Guangxi, Shaanxi, Guizhou, etc. ! CN +4348+08735 Asia/Urumqi most of Tibet & Xinjiang (offset 6 hours from UTC as base) ! CN +4348+08735 Asia/Wulumuqi most of Tibet & Xinjiang (using Beijing time) ! CN +3929+07559 Asia/Kashgar west Tibet & Xinjiang (offset 6 hours from UTC as base) ! CN +3929+07559 Asia/Kashi west Tibet & Xinjiang (using Beijing time) CO +0436-07405 America/Bogota CR +0956-08405 America/Costa_Rica CU +2308-08222 America/Havana ------- asia ------- *** /tmp/geta21865 Sat Nov 21 10:35:09 2009 --- /tmp/getb21865 Sat Nov 21 10:35:09 2009 *************** *** 1,4 **** ! # @(#)asia 8.44 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,4 ---- ! # @(#)asia 8.45 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 355,374 **** # Wusu, Qiemo, Xinyan, Wulanwusu, Jinghe, Yumin, Tacheng, Tuoli, Emin, # Shihezi, Changji, Yanqi, Heshuo, Tuokexun, Tulufan, Shanshan, Hami, # Fukang, Kuitun, Kumukuli, Miquan, Qitai, and Turfan. ! Zone Asia/Urumqi 5:50:20 - LMT 1928 # or Urumchi ! 6:00 - URUT 1980 May # Urumqi Time ! 8:00 PRC C%sT # Kunlun Time # West Tibet, including Pulan, Aheqi, Shufu, Shule; # West Xinjiang, including Aksu, Atushi, Yining, Hetian, Cele, Luopu, Nileke, # Zhaosu, Tekesi, Gongliu, Chabuchaer, Huocheng, Bole, Pishan, Suiding, # and Yarkand. ! Zone Asia/Kashgar 5:03:56 - LMT 1928 # or Kashi or Kaxgar ! 5:30 - KAST 1940 # Kashgar Time 5:00 - KAST 1980 May 8:00 PRC C%sT # From Lee Yiu Chung (2009-10-24): # I found there are some mistakes for the historial DST rule for Hong # Kong. Accoring to the DST record from Hong Kong Observatory (actually, --- 355,456 ---- # Wusu, Qiemo, Xinyan, Wulanwusu, Jinghe, Yumin, Tacheng, Tuoli, Emin, # Shihezi, Changji, Yanqi, Heshuo, Tuokexun, Tulufan, Shanshan, Hami, # Fukang, Kuitun, Kumukuli, Miquan, Qitai, and Turfan. ! # Kunlun Time # West Tibet, including Pulan, Aheqi, Shufu, Shule; # West Xinjiang, including Aksu, Atushi, Yining, Hetian, Cele, Luopu, Nileke, # Zhaosu, Tekesi, Gongliu, Chabuchaer, Huocheng, Bole, Pishan, Suiding, # and Yarkand. ! ! # From Luther Ma (2009-10-17): ! # Almost all (>99.9%) ethnic Chinese (properly ethnic Han) living in ! # Xinjiang use Chinese Standard Time. Some are aware of Xinjiang time, ! # but have no need of it. All planes, trains, and schools function on ! # what is called "Beijing time." When Han make an appointment in Chinese ! # they implicitly use Beijing time. ! # ! # On the other hand, ethnic Uyghurs, who make up about half the ! # population of Xinjiang, typically use "Xinjiang time" which is two ! # hours behind Beijing time, or UTC +0600. The government of the Xinjiang ! # Uyghur Autonomous Region, (XAUR, or just Xinjiang for short) as well as ! # local governments such as the Urumqi city government use both times in ! # publications, referring to what is popularly called Xinjiang time as ! # "Urumqi time." When Uyghurs make an appointment in the Uyghur language ! # they almost invariably use Xinjiang time. ! # ! # (Their ethnic Han compatriots would typically have no clue of its ! # widespread use, however, because so extremely few of them are fluent in ! # Uyghur, comparable to the number of Anglo-Americans fluent in Navajo.) ! # ! # (...As with the rest of China there was a brief interval ending in 1990 ! # or 1991 when summer time was in use. The confusion was severe, with ! # the province not having dual times but four times in use at the same ! # time. Some areas remained on standard Xinjiang time or Beijing time and ! # others moving their clocks ahead.) ! # ! # ...an example of an official website using of Urumqi time. ! # ! # The first few lines of the Google translation of ! # <a href="http://www.fjysgl.gov.cn/show.aspx?id=2379&cid=39"> ! # http://www.fjysgl.gov.cn/show.aspx?id=2379&cid=39 ! # </a> ! # (retrieved 2009-10-13) ! # > Urumqi fire seven people are missing the alleged losses of at least ! # > 500 million yuan ! # > ! # > (Reporter Dong Liu) the day before 20:20 or so (Urumqi Time 18:20), ! # > Urumqi City Department of International Plaza Luther Qiantang River ! # > burst fire. As of yesterday, 18:30, Urumqi City Fire officers and men ! # > have worked continuously for 22 hours... ! ! # From Luther Ma (2009-11-19): ! # With the risk of being redundant to previous answers these are the most common ! # English "transliterations" (w/o using non-English symbols): ! # ! # 1. Wulumuqi... ! # 2. Kashi... ! # 3. Urumqi... ! # 4. Kashgar... ! # ... ! # 5. It seems that Uyghurs in Urumqi has been using Xinjiang since at least the ! # 1960's. I know of one Han, now over 50, who grew up in the surrounding ! # countryside and used Xinjiang time as a child. ! # ! # 6. Likewise for Kashgar and the rest of south Xinjiang I don't know of any ! # start date for Xinjiang time. ! # ! # Without having access to local historical records, nor the ability to legally ! # publish them, I would go with October 1, 1949, when Xinjiang became the Uyghur ! # Autonomous Region under the PRC. (Before that Uyghurs, of course, would also ! # not be using Beijing time, but some local time.) ! ! # From Arthur David Olson (2009-11-21) ! # Use English transliterations of Han names of cities for names of zones using Han approaches; ! # use English transliterations of Uyghur names of cities for names of zones using Uyghur approaches. ! # Since (reportedly) at least some Uyghur have observed Beijing DST rules, ! # use PRC rules for Uyghur zones. ! ! # First the Han... ! ! Zone Asia/Wulumuqi 5:50:20 - LMT 1928 ! 6:00 - WULT 1980 May # Wulumuqi Time ! 8:00 PRC C%sT ! ! Zone Asia/Kashi 5:03:56 - LMT 1928 ! 5:30 - KAST 1940 # Kashi time 5:00 - KAST 1980 May 8:00 PRC C%sT + # ...and then the Uyghur... + Zone Asia/Urumqi 5:50:20 - LMT 1928 # or Urumchi + 6:00 PRC XIN%sT # Xinjiang Time + + Zone Asia/Kashgar 5:03:56 - LMT 1928 + 5:30 - KAST 1940 # Kashgar time + 5:00 - KAST 1949 Oct 1 + 6:00 PRC XIN%sT # Xinjiang Time + # From Lee Yiu Chung (2009-10-24): # I found there are some mistakes for the historial DST rule for Hong # Kong. Accoring to the DST record from Hong Kong Observatory (actually,

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Guatemala may observe DST in 2010
by Steffen Thorsen 24 Nov '09

24 Nov '09

According to many news sources, Guatemala may observe DST again in 2010. The proposal is to observe DST from April 3 to October 30: http://www.prensalibre.com.gt/pl/2009/noviembre/18/356771.html We will keep this page updated: http://www.timeanddate.com/news/time/guatemala-considers-dst.html Best regards, Steffen Thorsen - timeanddate.com

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Re: Xinjiang
by Olson, Arthur David (NIH/NCI) [E] 20 Nov '09

20 Nov '09

As I understand it, there are two groups (Han and Uyghur) in two different current time zone regions ("Asia/Urumqi" and "Asia/Kashgar") using different times. A blessing: nobody involved currently does daylight saving. Since DST is not in effect, a workaround is to set the environment variable, either... TZ=XJT-6 ...or... TZ=XST-6 ...to get the desired effect. Here are questions to be answered prior to setting up zones in the "asia" file: 1. What's the English translation of the Han name of the city with the largest Han population in Asia/Urumqi? 2. What's the English translation of the Han name of the city with the largest Han population in Asia/Kashgar? 3. What's the English translation of the Uyghur name of the city with the largest Uyghur population in Asia/Urumqi? 4. What's the English translation of the Uyghur name of the city with the largest Uyghur population in Asia/Urumqi? 5. When exactly did the Asia/Urumqi Uyghurs start using their own distinct time? 6. When exactly did the Asia/Kashgar Uyghurs start using their own distinct time? The path forward depends on the answers to the above questions. --ado

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Re: Xinjiang
by Olson, Arthur David (NIH/NCI) [E] 18 Nov '09

18 Nov '09

As I understand it, there are two groups (Han and Uyghur) in two different current time zone regions ("Asia/Urumqi" and "Asia/Kashgar") using different times. A blessing: nobody involved currently does daylight saving. Since DST is not in effect, a workaround is to set the environment variable, either... TZ=XJT-6 ...or... TZ=XST-6 ...to get the desired effect. Here are questions to be answered prior to setting up zones in the "asia" file: 1. What's the English translation of the Han name of the city with the largest Han population in Asia/Urumqi? 2. What's the English translation of the Han name of the city with the largest Han population in Asia/Kashgar? 3. What's the English translation of the Uyghur name of the city with the largest Uyghur population in Asia/Urumqi? 4. What's the English translation of the Uyghur name of the city with the largest Uyghur population in Asia/Urumqi? 5. When exactly did the Asia/Urumqi Uyghurs start using their own distinct time? 6. When exactly did the Asia/Kashgar Uyghurs start using their own distinct time? The path forward depends on the answers to the above questions. --ado

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Correction for Africa 2009r
by David Stonehill 18 Nov '09

18 Nov '09

Thank you for the outstanding work you are doing on time zone history and definitions. It is unique on the web. In tz version 2009r, africa, the Rules for Mauritius and the Zone for Indian/Mauritius all need a tab character between the word "Rule" or "Zone" and the following arguments Inserting this character will make these lines consistent with other similar lines in the file. Thanks again. Dave Stonehill

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FW: Correction for Africa 2009r
by Olson, Arthur David (NIH/NCI) [E] 18 Nov '09

18 Nov '09

I'm forwarding this message from Dave Stonehill, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. --ado -----Original Message----- From: David Stonehill [mailto:stonehdl@muohio.edu] Sent: Tuesday, November 17, 2009 3:41 To: tz(a)lecserver.nci.nih.gov Subject: Correction for Africa 2009r Thank you for the outstanding work you are doing on time zone history and definitions. It is unique on the web. In tz version 2009r, africa, the Rules for Mauritius and the Zone for Indian/Mauritius all need a tab character between the word "Rule" or "Zone" and the following arguments Inserting this character will make these lines consistent with other similar lines in the file. Thanks again. Dave Stonehill

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