May 2010 - 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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proposed time zone package changes (Bahia de Banderas; version naming)
by Arthur David Olson 14 Jun '10

14 Jun '10

Here are proposed changes to the time zone package: northamerica New "Bahia_Banderas" time zone (omitting the "de" to stay within 14 characters) zone.tab New "Bahia_Banderas" time zone tz-link.htm Add sentence on time zone version naming. If no problems are found, these should show up on the ftp site on 2010-05-10. --ado ------- northamerica ------- *** /tmp/geta2310 Sat May 1 10:13:44 2010 --- /tmp/getb2310 Sat May 1 10:13:44 2010 *************** *** 1,5 **** # <pre> ! # @(#)northamerica 8.30 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,5 ---- # <pre> ! # @(#)northamerica 8.31 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 2089,2095 **** --- 2089,2132 ---- -8:00 - PST 1970 -7:00 Mexico M%sT 1999 -7:00 - MST + + # From Alexander Krivenyshev (2010-04-21): + # According to news, Bahía de Banderas (Mexican state of Nayarit) + # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to + # share the same time zone as nearby city Puerto Vallarta, Jalisco). + # + # (Spanish) + # Bahía de Banderas homologa su horario al del centro del + # país, a partir de este domingo + # <a href="http://www.nayarit.gob.mx/notes.asp?id=20748"> + # http://www.nayarit.gob.mx/notes.asp?id=20748 + # </a> + # + # Bahía de Banderas homologa su horario con el del Centro del + # País + # <a href="http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&vi…"> + # http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&vi…" + # </a> + # + # (English) + # Puerto Vallarta and Bahía de Banderas: One Time Zone + # <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-…"> + # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-… + # </a> + # + # or + # <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html"> + # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html + # </a> + # + # "Mexico's Senate approved the amendments to the Mexican Schedule System that + # will allow Bahía de Banderas and Puerto Vallarta to share the same time + # zone ..." # Baja California Sur, Nayarit, Sinaloa + + # From Arthur David Olson (2010-05-01): + # Use "Bahia_Banderas" to keep the name to fourteen characters. + Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 *************** *** 2100,2105 **** --- 2137,2155 ---- -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 -7:00 Mexico M%sT + + Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 + -7:00 - MST 1927 Jun 10 23:00 + -6:00 - CST 1930 Nov 15 + -7:00 - MST 1931 May 1 23:00 + -6:00 - CST 1931 Oct + -7:00 - MST 1932 Apr 1 + -6:00 - CST 1942 Apr 24 + -7:00 - MST 1949 Jan 14 + -8:00 - PST 1970 + -7:00 Mexico M%sT 2010 Apr 4 + -6:00 Mexico C%sT + # Baja California (near US border) Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 -7:00 - MST 1924 ------- tz-link.htm ------- *** /tmp/geta2330 Sat May 1 10:14:05 2010 --- /tmp/getb2330 Sat May 1 10:14:05 2010 *************** *** 18,24 **** <body> <h1>Sources for Time Zone and Daylight Saving Time Data</h1> <address> ! @(#)tz-link.htm 8.26 </address> <p> This file is in the public domain, so clarified as of --- 18,24 ---- <body> <h1>Sources for Time Zone and Daylight Saving Time Data</h1> <address> ! @(#)tz-link.htm 8.27 </address> <p> This file is in the public domain, so clarified as of *************** *** 89,94 **** --- 89,96 ---- where <code><var>C</var></code> is the code's version; similarly, the data are in <code>tzdata<var>D</var>.tar.gz</code>, where <code><var>D</var></code> is the data's version. + Each version is a four-digit year followed by lower-case letters + (a through z, then za through zz, then zza through zzz, and so on). The following <a href="http://en.wikipedia.org/wiki/Unix_shell">shell</a> commands download these files to a <abbr>GNU</abbr>/Linux or similar host; ------- zone.tab ------- *** /tmp/geta2358 Sat May 1 10:14:46 2010 --- /tmp/getb2358 Sat May 1 10:14:46 2010 *************** *** 1,5 **** # <pre> ! # @(#)zone.tab 8.35 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. # --- 1,5 ---- # <pre> ! # @(#)zone.tab 8.36 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. # *************** *** 288,293 **** --- 288,294 ---- MX +2904-11058 America/Hermosillo Mountain Standard Time - Sonora MX +3232-11701 America/Tijuana US Pacific Time - Baja California near US border MX +3018-11452 America/Santa_Isabel Mexican Pacific Time - Baja California away from US border + MX +2048-10515 America/Bahia_Banderas Mexican Central Time - Bahia de Banderas MY +0310+10142 Asia/Kuala_Lumpur peninsular Malaysia MY +0133+11020 Asia/Kuching Sabah & Sarawak MZ -2558+03235 Africa/Maputo

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FW: Timezone option
by Olson, Arthur David (NIH/NCI) [E] 25 May '10

25 May '10

I'm forwarding this message from Honey Bajaj, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. (On some systems, setting TZ to "GMT-48" may do what HB wants.) --ado From: honey bajaj [mailto:honeybajaj1@rediffmail.com] Sent: Tuesday, May 25, 2010 3:36 To: tz(a)lecserver.nci.nih.gov Subject: Timezone option Hi, I have a testing requirement which needs to alter the system date to a couple of days ahead of current date. I am wondering if its possible to have a custom timezone which can provide this date change ability to drift the current time to couple of days ahead by setting the TZ environment variable. Regards,

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Russian time zone issue reported
by Gary Lasker 25 May '10

25 May '10

Hello! I've been getting started maintaining tzdata for Ubuntu, and I wanted to check in with the list regarding an issue reported by an Ubuntu user in the following bug report (please refer to comment #16 posted by Guria: https://bugs.launchpad.net/ubuntu/lucid/+source/tzdata/+bug/540295 The comment from Guria is as follows: "Just looked at timezones more precisely. Unfortunately changes are wrong. In changed tz's was set only summer time, but winter time stays unchanged. This timezones doesn't exists already in fact. Europe/Samara is now exactly equal Europe/Moscow, Asia/Kamchatka is Asia/Magadan. Follow next link for details: http://wwp.greenwichmeantime.com/time-zone/russia/time-zones/index.htm Also, please don't forget to provide this info to upstream or other distributions." I'd appreciate it very much if somebody could review this statement to determine what, if any, action may be required. Thank you very much and please email me if there's anything further I can provide. I'll be following responses on-list. Thanks again and best regards, Gary Lasker

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Information Requeté
by Maameri, Adraa 18 May '10

18 May '10

Hello, As you know, there are some countries that change their time zone randomly in the year. We have Egyptian users that want to know if it is possible to create another time zone called Cairo (+3:00). They will change manually their time zones and the best point is that the time of their meetings won't be shifted. Do you think it is possible to do ? Thanks in advance for your response. Regards, </PRE><p style="font-family:arial;color:grey" style="font-size:13px">This message contains information that may be privileged or confidential and is the property of the Capgemini Group. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain, copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message.</p><PRE>

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Xinjiang Time
by Luther Ma 15 May '10

15 May '10

With the restoration of internet to Xinjiang yesterday after a ten month hiatus, I would like to make one more plea for Xinjiang Time to be included in the tz database. (Last year we discussed Xinjiang Time, a semi-official time used primarily by minority ethnic groups in the Xinjiang Uyghur Autonomous Region of China, as well as in some official Xinjiang Chinese language publications.) Although any proposal is better than nothing at this point, I've summarized here my preferences and my reasons. 1. That the locations be the already existing Urumqi/Asia and Kashgar/ Asia. These already exist in the database and have been the most common English spelling on the Internet and on maps for some time. (These names correspond closely to the Uyghur pronunciation and are probably more commonly used because of the autonomous region status of the area. The "q" in Urumqi is pronounced like the "ch' in English.) 2. That the name of the time zone be called Xinjiang Time, abbreviated XJT. This nomenclature corresponds word for word with the most common usage in Chinese and Uyghur, as well as all references to it I can find in English. It would therefore be immediately recognizable by users of Xinjiang Time. This would also agree with the recommendations in the Theory file. > If there is no common English abbreviation, abbreviate the English > translation of the usual phrase used by native speakers. URUT for Urumqi Time would be another possibility as it is a recognized, perhaps more official term, but not nearly as widely used. 3. That no other location be added (especially with the same latitude and longitude) to accommodate the use of Beijing Time (also widely used in Xinjiang, esp. by close to 100% of the ethnic Han population). The reason for this is two-fold. a. It agrees with the recommendations in Theory, Urumqi being quite a bit smaller than Beijing > Use the most populous among locations in a country's time zone, > e.g. prefer `Shanghai' to `Beijing' and by definition is redundant. > If all the clocks in a country's region have agreed since 1970, > don't bother to include more than one location b. But perhaps more critically, it is an added difficulty to implement two zones having the same position on most GUI's. I am afraid that GUI developers would choose the more commonly used time and that Xinjiang time, although present in the tzdata would be swallowed up in the user interface. 4. And lastly, that no effort be made to link the time zone with summer time changes that happened in the rest of the country during the late eighties, as the local populace, at least to some extent, continued to use standard time. If it is, however, desirable to have a summer time, I believe the abbreviation XJST would most closely follow the recommendations of the Theory file So these, then, are my suggestions and the reasons why. Thanks for taking another look into this, -Luther PS I have been patching the tzdata for my own use as well as for a very small distribution, which I have pasted below in case it is of any use to others or in changing the official version. $ diff -c tzdata2010j/asia proposedXJT/asia *** tzdata2010j/asia 2010-05-10 21:07:27.000000000 +0800 --- proposed XJT/asia 2010-05-15 19:08:24.000000000 +0800 *************** *** 390,396 **** # 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, --- 390,396 ---- # Fukang, Kuitun, Kumukuli, Miquan, Qitai, and Turfan. Zone Asia/Urumqi 5:50:20 - LMT 1928 # or Urumchi 6:00 - URUT 1980 May # Urumqi Time ! 6:00 - XJT # Kunlun Time # West Tibet, including Pulan, Aheqi, Shufu, Shule; # West Xinjiang, including Aksu, Atushi, Yining, Hetian, Cele, Luopu, Nileke, *************** *** 462,468 **** 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): --- 462,468 ---- Zone Asia/Kashgar 5:03:56 - LMT 1928 # or Kashi or Kaxgar 5:30 - KAST 1940 # Kashgar Time 5:00 - KAST 1980 May ! 6:00 - XJT # From Lee Yiu Chung (2009-10-24):

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gmtime() oddities for large values
by Edwin Groothuis 13 May '10

13 May '10

Hello! With my hat of the tzdata/tzcode maintainer on the FreeBSD system, I sometimes get the more interesting bugs reported. For example this piece of code, on 64 bit machines it returns the same values for values bigger than the initial one: #include <errno.h> #include <stdint.h> #include <stdio.h> #include <time.h> void t_inspect(time_t t) { struct tm *tp; errno = 0; tp = gmtime(&t); printf("t: %ld, tp: %p errno: %d\n", t, tp, errno); if (tp) printf("sec: %d, min: %d, hour: %d, mday: %d, mon: %d, " "year: %d, wday: %d, yday: %d, isdst: %d, gmtoff: %ld, " "zone: %s\n", tp->tm_sec, tp->tm_min, tp->tm_hour, tp->tm_mday, tp->tm_mon, tp->tm_year, tp->tm_wday, tp->tm_yday, tp->tm_isdst, tp->tm_gmtoff, tp->tm_zone); } int main(void) { // time_t t = INT32_MAX; time_t t = 67767976233532799; t_inspect(t-1); t_inspect(t); t_inspect(t+1); t_inspect(t+2); return 0; } The output on a 64 bit machine is (the interesting part is the sec=59) t: 67767976233532798, tp: 0x80085b9a0 errno: 2 sec: 58, min: 59, hour: 23, mday: 31, mon: 11, year: 2147481747, wday: 2, yday: 364, isdst: 0, gmtoff: 0, zone: UTC t: 67767976233532799, tp: 0x80085b9a0 errno: 0 sec: 59, min: 59, hour: 23, mday: 31, mon: 11, year: 2147481747, wday: 2, yday: 364, isdst: 0, gmtoff: 0, zone: UTC t: 67767976233532800, tp: 0x80085b9a0 errno: 0 sec: 59, min: 59, hour: 23, mday: 31, mon: 11, year: 2147481747, wday: 2, yday: 364, isdst: 0, gmtoff: 0, zone: UTC t: 67767976233532801, tp: 0x80085b9a0 errno: 0 sec: 59, min: 59, hour: 23, mday: 31, mon: 11, year: 2147481747, wday: 2, yday: 364, isdst: 0, gmtoff: 0, zone: UTC Right now, I am looking for confirmation from people on the list if this behaviour is also happening on other 64 bit operating systems or that it is a FreeBSD specific quirk. Edwin

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