March 2007 - tz - lists.iana.org

proposed tz change for Latvia, Lithuania
by Paul Eggert May 25, 2015

May 25, 2015

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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Tomsk wrong timezone
by Jesper Norgaard Welen Feb. 18, 2011

Feb. 18, 2011

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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Chinese timezones 1970
by Jesper Norgaard Welen Sept. 14, 2008

Sept. 14, 2008

I have investigated the timezones around 1970 on the http://www.astro.com/atlas site, and here are the results. I am attaching a GIF file of the map I have built based on this information. The red borders are the modern-time administrative borders, while the green lines are the timezone borders I have determined, note that some of them are partially hidden behind the red lines. There are no big surprises. Most timezones follow modern-day administrative boundaries, with the exceptions being Xinjiang, Xizang (Tibet), Qinghai, Gansu, Nei Mongol (Inner Mongolia) and Guangdong. There was an exception in Heliongjiang region on GMT+8.5 where the northern-most county Mohe is on GMT+8. A few other exceptions were two counties on the Sichuan side of the Xizang - Sichuan border, counties Dege and Baiyu which lies on the Sichuan side and are therefore supposed to be GMT+7, Xizang region being GMT+6, but Dege county is GMT+8 according to astro.com while Baiyu county is GMT+6 (could be true), for the moment I am assuming that those two counties are mistakes in the astro.com data. The biggest surprise was that region Guangdong were dived in 3 timezones, a south/west part on GMT+6 (counties Xuwen, Haikang, Suixi, Lianjiang, Zhanjiang, Wuchuan, Huazhou, Gaozhou, Maoming, Dianbai, Xinyi) a central part on GMT+7 (counties Yangchun, Yangjiang, Taishan, Kaiping, Xinxing, Luoding, Yu'nan, Yunfu, Taishan, Deqing and Enping) and a north/east part on GMT+8 with the rest of the counties. Zone Asia/Harbin on GMT+8.5: regions Heilongjiang (minus Mohe) and Jilin. Zone Asia/Shanghai on GMT+8: regions east Nei Mongol, Liaoning, Hebei + Beijing, Shanxi, Shandong, Henan, Jiangsu, Anhui, Shanghai, Zhejiang, Hubei, Hunan, Jiangxi, Fujian, north/east Guangdong and Mohe county of Heilongjiang. Zone Asia/Chongqing on GMT+7: regions west Nei Mongol, Ningxia, Shaanxi, east Gansu, west Qinghai, Sichuan, Guizhou, Guangxi, Yunnan, Hainan island and the central part of Guangdong province. Zone Asia/Urumqi on GMT+6: regions east Xinjiang, west Gansu (counties Dunhuang, Aksay, Anxi, Subei), west Qinghai, east Xizang (Tibet) and east Guangdong. Zone Asia/Kashgar on GMT+5: regions west Xinjiang, west Xizang. 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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Honduras seems to cancel DST
by Steffen Thorsen March 30, 2007

March 30, 2007

A user informed that Honduras will start DST on Sunday 2007-04-01, and after some research, it seems that they first planned to start DST on 2007-04-01: (one month earlier than in 2006) http://www.laprensahn.com/pais_nota.php?id04962=7196&t=1175061600 Then I found another, newer article, which is translated to something like "Government reconsiders and suspends advancement of hour" http://www.laprensahn.com/pais_nota.php?id04962=7386&t=1175234400 So it seems that Honduras will not enter DST this year, if I understood the article correctly. Best regards, Steffen Thorsen / timeanddate.com

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why UCLA's mail server thinks it's still standard time
by Paul Eggert March 29, 2007

March 29, 2007

Re the UCLA mail server problem I mentioned today: the UCLA Network Operations Center replied "The DST patch was not applied intentionally because it will have to be done during a maintenance window." So it could be a long time before that server knows about the 2007 DST rule change. I expect a lot of servers are in similar boats. Administrators are so worried about introducing problems with a DST patch that they simply live with the clocks being wrong.

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Health risks of daylight saving time
by Paul Eggert March 29, 2007

March 29, 2007

Since the subject of health risks is in the news.... The main health effects of DST that I know of are the following. * Extra afternoon daylight may encourage people to exercise more, which should be a big win. * Sunlight triggers vitamin D synthesis, but overexposure leads to skin cancer; so whether DST helps or hurts here depends on your latitude and daily schedule. * DST may be helpful in fighting some forms of depression: Henry Olders (2003-08-13). "Average sunrise time predicts depression prevalence". Journal of Psychosomatic Research 55 (2): 99-105. DOI:10.1016/S0022-3999(02)00479-8. Some argue the reverse, though. * DST can help night-blindness sufferers, though it can also hurt: it depends on their schedule. * DST's clock-changes temporarily disrupt the sleep cycle, which can lead to suboptimal decisions (e.g., while driving, or while trading stocks). There have been several studies of these secondary effects, but I know of no studies of any direct health risks. So the vast majority of this stuff is speculative and/or anecdotal; there's only one scientific study that I know of.

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Kemerovo region votes against DST
by Paul Eggert March 29, 2007

March 29, 2007

RIA Novosti reported yesterday that the Kemerovo Region parliamant has voted to appeal to the Russian government to abolish DST, and Nikolai Gerasimenko, Russia's deputy chair of the State Duma's Health Protection Committee, agrees with them. See <http://en.rian.ru/russia/20070328/62754276.html>. The MPs claim that DST is harmful to human health, as it may lead to chronic diseases, harm the immune system, increase mortality rate and risks for hypertensive patients. None of these reported health problems have been investigated scientifically as far as I know. Russia's electricity monopoly said that in 2007 DST saved Russia 2 GWh of electricity, but Gersimenko says the overall economic advantage of DST isn't proven. This reminds me of the successful compaign to abolish DST in Kazakhstan, which was based on the harmful health effects due to clock changes, including "insomnia, spikes in blood pressure, endocrinal deviations and the exacerbation of chronic diseases" <http://www.kazsociety.org.uk/news/2005/03/30.htm>.

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proposed tz change for Syria effective in about 3.5 hours
by Paul Eggert March 29, 2007

March 29, 2007

The AP reports that Syria is changing its clocks in about 3.5 hours. That's not much notice, but here is a proposed patch for this, along with a comment about the Kuwait situation. =================================================================== RCS file: RCS/asia,v retrieving revision 2007.4 retrieving revision 2007.4.0.2 diff -pu -r2007.4 -r2007.4.0.2 --- asia 2007/03/20 12:48:12 2007.4 +++ asia 2007/03/29 18:29:37 2007.4.0.2 @@ -1161,6 +1161,14 @@ Zone Asia/Pyongyang 8:23:00 - LMT 1890 # Kuwait # Zone NAME GMTOFF RULES FORMAT [UNTIL] +# From the Arab Times (2007-03-14): +# The Civil Service Commission (CSC) has approved a proposal forwarded +# by MP Ahmad Baqer on implementing the daylight saving time (DST) in +# Kuwait starting from April until the end of Sept this year, reports Al-Anba. +# <http://www.arabtimesonline.com/arabtimes/kuwait/Viewdet.asp?ID=9950>. +# From Paul Eggert (2007-03-29): +# We don't know the details, or whether the approval means it'll happen, +# so for now we assume no DST. Zone Asia/Kuwait 3:11:56 - LMT 1950 3:00 - AST @@ -1710,11 +1718,17 @@ Rule Syria 1993 only - Sep 25 0:00 0 - Rule Syria 1994 1996 - Apr 1 0:00 1:00 S Rule Syria 1994 2005 - Oct 1 0:00 0 - Rule Syria 1997 1998 - Mar lastMon 0:00 1:00 S -Rule Syria 1999 max - Apr 1 0:00 1:00 S +Rule Syria 1999 2006 - Apr 1 0:00 1:00 S # From Stephen Colebourne (2006-09-18): # According to IATA data, Syria will change DST on 21st September [21:00 UTC] # this year [only].... This is probably related to Ramadan, like Egypt. Rule Syria 2006 only - Sep 22 0:00 0 - +# From Paul Eggert (2007-03-29): +# Today the AP reported "Syria will switch to summertime at midnight Thursday." +# http://www.iht.com/articles/ap/2007/03/29/africa/ME-GEN-Syria-Time-Change.p… +# For lack of better info, assume the rule changed to "last Friday in March" +# this year. +Rule Syria 2007 max - Mar lastFri 0:00 1:00 S Rule Syria 2007 max - Oct 1 0:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Damascus 2:25:12 - LMT 1920 # Dimashq

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Time bobbles
by Olson, Arthur David (NIH/NCI) [E] March 29, 2007

March 29, 2007

Word from a Washington, DC-area AOL subscriber is that their outgoing electronic mail is still being marked with "EST" time stamps that are an hour behind wall clock time. Do folks know of other high-visibility bobbles of the change in US DST rules? --ado

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tz distribution
by Lue, Ian March 28, 2007

March 28, 2007

Is there any documentation regarding the differences between the current release '2007d' and the previous release '2007c' of the tzcode and tzdata distribution files? Thanks, Ian Lue This message and any attachment are confidential and may be privileged or otherwise protected from disclosure. If you are not the intended recipient, please telephone or email the sender and delete this message and any attachment from your system. If you are not the intended recipient you must not copy this message or attachment or disclose the contents to any other person.

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