September 2007 - 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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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

3 2

Chinese timezones 1970
by Jesper Norgaard Welen 14 Sep '08

14 Sep '08

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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proposed tz changes for Brazil, Egypt, Iran, Gaza, Venezuela
by Paul Eggert 07 Nov '07

07 Nov '07

Here are proposed changes to the tz database for the news items we've accumulated recently: * Brazil will observe DST from 2007-10-14 00:00 to 2008-02-17 00:00. (Thanks to Steffen Thorsen for this.) * Egypt switched earlier than we expected. (Thanks to Dirk Losch and Jesper Norgaard Welen for this.) * Likewise for Gaza. (Thanks to Jesper Norgaard Welen for this.) * Iran will resume DST next year. (Thanks to Jesper Norgaard Welen for this.) * Venezuela is currently planning to change time zones on January 1, to -04:30. This seems to be a bit disorganized, but I suppose we can change the database later as needed. =================================================================== RCS file: RCS/africa,v retrieving revision 2007.7 retrieving revision 2007.7.0.1 diff -pu -r2007.7 -r2007.7.0.1 --- africa 2007/08/20 14:45:10 2007.7 +++ africa 2007/09/07 22:39:16 2007.7.0.1 @@ -224,9 +224,19 @@ Rule Egypt 2006 only - Sep 21 23:00s 0 - # From Jesper Norgaard Welen (2007-08-15): [The following agree:] # http://www.nentjes.info/Bill/bill5.htm # http://www.timeanddate.com/worldclock/city.html?n=53 +# From Steffen Thorsen (2007-09-04): The official information...: +# http://www.sis.gov.eg/En/EgyptOnline/Miscellaneous/000002/02070000000000000… +Rule Egypt 2007 only - Sep Thu>=1 23:00s 0 - +# From Abdelrahman Hassan (2007-09-06): +# Due to the Hijri (lunar Islamic calendar) year being 11 days shorter +# than the year of the Gregorian calendar, Ramadan shifts earlier each +# year. This year it will be observed September 13 (September is quite +# hot in Egypt), and the idea is to make fasting easier for workers by +# shifting business hours one hour out of daytime heat. Consequently, +# unless discontinued, next DST may end Thursday 28 August 2008. # From Paul Eggert (2007-08-17): -# For lack of better info, assume the new rule is first Thursday. -Rule Egypt 2007 max - Sep Thu>=1 23:00s 0 - +# For lack of better info, assume the new rule is last Thursday in August. +Rule Egypt 2008 max - Aug lastThu 23:00s 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Cairo 2:05:00 - LMT 1900 Oct =================================================================== RCS file: RCS/asia,v retrieving revision 2007.5 retrieving revision 2007.5.0.1 diff -pu -r2007.5 -r2007.5.0.1 --- asia 2007/04/02 14:10:56 2007.5 +++ asia 2007/09/20 22:44:02 2007.5.0.1 @@ -568,14 +568,15 @@ Zone Asia/Jayapura 9:22:48 - LMT 1932 No # Reingold's/Dershowitz' calculator gives correctly the Gregorian date # 2058-03-21 for 1 Farvardin 1437 (astronomical). # -# From Paul Eggert (2006-03-22): -# The above comments about post-2006 transitions may become relevant again, -# if Iran ever resuscitates DST, so we'll leave the comments in. -# # From Steffen Thorsen (2006-03-22): # Several of my users have reported that Iran will not observe DST anymore: # http://www.irna.ir/en/news/view/line-17/0603193812164948.htm # +# From Reuters (2007-09-16), with a heads-up from Jesper Norgaard Welen: +# ... the Guardian Council ... approved a law on Sunday to re-introduce +# daylight saving time ... +# http://uk.reuters.com/article/oilRpt/idUKBLA65048420070916 +# # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Iran 1978 1980 - Mar 21 0:00 1:00 D Rule Iran 1978 only - Oct 21 0:00 0 S @@ -596,6 +597,36 @@ Rule Iran 2004 only - Mar 21 0:00 1:00 D Rule Iran 2004 only - Sep 21 0:00 0 S Rule Iran 2005 only - Mar 22 0:00 1:00 D Rule Iran 2005 only - Sep 22 0:00 0 S +Rule Iran 2008 only - Mar 21 0:00 1:00 D +Rule Iran 2008 only - Sep 21 0:00 0 S +Rule Iran 2009 2011 - Mar 22 0:00 1:00 D +Rule Iran 2009 2011 - Sep 22 0:00 0 S +Rule Iran 2012 only - Mar 21 0:00 1:00 D +Rule Iran 2012 only - Sep 21 0:00 0 S +Rule Iran 2013 2015 - Mar 22 0:00 1:00 D +Rule Iran 2013 2015 - Sep 22 0:00 0 S +Rule Iran 2016 only - Mar 21 0:00 1:00 D +Rule Iran 2016 only - Sep 21 0:00 0 S +Rule Iran 2017 2019 - Mar 22 0:00 1:00 D +Rule Iran 2017 2019 - Sep 22 0:00 0 S +Rule Iran 2020 only - Mar 21 0:00 1:00 D +Rule Iran 2020 only - Sep 21 0:00 0 S +Rule Iran 2021 2023 - Mar 22 0:00 1:00 D +Rule Iran 2021 2023 - Sep 22 0:00 0 S +Rule Iran 2024 only - Mar 21 0:00 1:00 D +Rule Iran 2024 only - Sep 21 0:00 0 S +Rule Iran 2025 2027 - Mar 22 0:00 1:00 D +Rule Iran 2025 2027 - Sep 22 0:00 0 S +Rule Iran 2028 2029 - Mar 21 0:00 1:00 D +Rule Iran 2028 2029 - Sep 21 0:00 0 S +Rule Iran 2030 2031 - Mar 22 0:00 1:00 D +Rule Iran 2030 2031 - Sep 22 0:00 0 S +Rule Iran 2032 2033 - Mar 21 0:00 1:00 D +Rule Iran 2032 2033 - Sep 21 0:00 0 S +Rule Iran 2034 2035 - Mar 22 0:00 1:00 D +Rule Iran 2034 2035 - Sep 22 0:00 0 S +Rule Iran 2036 2037 - Mar 21 0:00 1:00 D +Rule Iran 2036 2037 - Sep 21 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Tehran 3:25:44 - LMT 1916 3:25:44 - TMT 1946 # Tehran Mean Time @@ -1518,6 +1549,17 @@ Zone Asia/Karachi 4:28:12 - LMT 1907 # I guess it is likely that next year's date will be moved as well, # because of the Ramadan. +# From Jesper Norgaard Welen (2007-09-18): +# According to Steffen Thorsen's web site the Gaza Strip and the rest of the +# Palestinian territories left DST early on 13.th. of September at 2:00. + +# From Paul Eggert (2007-09-20): +# My understanding is that Gaza and the West Bank disagree even over when +# the weekend is (Thursday+Friday versus Friday+Saturday), so I'd be a bit +# surprised if they agreed about DST. But for now, assume they agree. +# For lack of better information, predict that future changes will be +# the 2nd Thursday of September at 02:00. + # The rules for Egypt are stolen from the `africa' file. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule EgyptAsia 1957 only - May 10 0:00 1:00 S @@ -1533,7 +1575,7 @@ Rule Palestine 2004 only - Oct 1 1:00 0 Rule Palestine 2005 only - Oct 4 2:00 0 - Rule Palestine 2006 max - Apr 1 0:00 1:00 S Rule Palestine 2006 only - Sep 22 0:00 0 - -Rule Palestine 2007 max - Oct Fri>=15 0:00 0 - +Rule Palestine 2007 max - Sep Thu>=8 2:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Gaza 2:17:52 - LMT 1900 Oct =================================================================== RCS file: RCS/southamerica,v retrieving revision 2007.4 retrieving revision 2007.4.0.1 diff -pu -r2007.4 -r2007.4.0.1 --- southamerica 2007/03/20 12:48:12 2007.4 +++ southamerica 2007/09/27 20:14:56 2007.4.0.1 @@ -424,6 +424,10 @@ Zone America/La_Paz -4:32:36 - LMT 1890 # modern Brazilian eletronic voting machines which, apparently, can't deal # with a time change between the first and the second rounds of the elections. +# From Steffen Thorsen (2007-09-20): +# Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: +# http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F02852… + # From Paul Eggert (2002-10-10): # The official decrees referenced below are mostly taken from # <a href="http://pcdsh01.on.br/DecHV.html"> @@ -557,13 +561,18 @@ Rule Brazil 2004 only - Nov 2 0:00 1:0 # Decree <a href="http://pcdsh01.on.br/DecHV5539.gif">5,539</a> (2005-09-19), # adopted by the same states as before. Rule Brazil 2005 only - Oct 16 0:00 1:00 S -# Decree <a href="http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2006/Decreto/D5920.htm">5,920</a> -# (2006-10-03), adopted by the same states as before. -Rule Brazil 2006 max - Nov Sun>=1 0:00 1:00 S -Rule Brazil 2007 max - Feb lastSun 0:00 0 - +# Decree <a href="http://pcdsh01.on.br/DecHV5920.gif">5,920</a> (2006-10-03), +# adopted by the same states as before. +Rule Brazil 2006 only - Nov 5 0:00 1:00 S +Rule Brazil 2007 only - Feb 25 0:00 0 - +# (Decree number not yet known) +# http://www.brasil.gov.br/noticias/ultimas_noticias/horario_verao070920/ +# (2007-09-20) after a heads-up from Steffen Thorsen: +Rule Brazil 2007 max - Oct Sun>=8 0:00 1:00 S +Rule Brazil 2008 max - Feb Sun>=15 0:00 0 - # The latest ruleset listed above says that the following states observe DST: # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. -# For dates after mid-2007, the above rules with TO="max" are guesses +# For dates after mid-2008, the above rules with TO="max" are guesses # and are quite possibly wrong, but are more likely than no DST at all. @@ -1097,8 +1106,20 @@ Zone America/Montevideo -3:44:44 - LMT 1 -3:00 Uruguay UY%sT # Venezuela +# +# From Kiraz Janicke (2007-09-25), in +# http://www.venezuelanalysis.com/analysis/2645: +# The proposal ... involves turning the clock back half an hour from +# +4.00 Greenwich Mean Time (GMT), to +4.30GMT, the time zone +# Venezuela had until December 31, 1964, when the current time zone +# was adopted. The change was due to take place on September 17 and +# then on September 24, but has since been postponed until December +# 31, to allow for compliance with international organizations, such +# as the International Office of Weights and Measures. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Caracas -4:27:44 - LMT 1890 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? -4:30 - VET 1965 # Venezuela Time - -4:00 - VET + -4:00 - VET 2008 + -4:30 - VET

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new tz database implementation
by Rich Tibbett 29 Sep '07

29 Sep '07

Hello, I'd like to let you know that I have been working on a small project to map country borders to the information provided by the tz database. I thought it might be quite interesting, as you can effectively enter any co-ordinate points on earth and it will return the time for the given location. Additionally you can enter any country, town, city, street name or zip code and it will give you the time, thanks to those clever guys over at Google. Currently, I've evaluated the accuracy to be 96%, with an accuracy at timezone borders to within 3 miles. Do you think that this is an acceptable starting point for launch? Those last few percent are proving very difficult indeed! I will be continuing this project, as I think it may be useful to someone, somewhere in the future. However, I would appreciate your feedback and input should you have any comments or questions or thoughts at this stage. Many Thanks, Richard

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warning in localtime.c
by Phillip Hellewell 28 Sep '07

28 Sep '07

I'm getting this warning in localtime.c on the last line of differ_by_repeat function. This is 2007g code. warning: comparison is always false due to limited range of data type Is this something I should be worried about? Phillip

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Detroit/Cleveland time zones
by Jeff Prucher 27 Sep '07

27 Sep '07

Here is some support for Garland's assertion that ``Cleveland and Detroit advanced their clocks one hour in 1914.'' (Well, at least the Cleveland part.) This does suggest that parts of Ohio were in the central time zone before then, and not in North America/New York. >From "The Newark (Ohio) Daily Advocate", June 18, 1914, page 4, column 2: Cleveland and several other Ohio cities have recently changed or planned to change their clocks from Central to Eastern standard time. As every clock will be set one hour ahead, that means that there will be one hour more of day-light after supper or dinner, whichever the evening meal is called. >From "The Ogden (Utah) Standard", June 20, 1914, page 4, column 1 : Cleveland is about to change its clocks from central to eastern standard time, in order to make longer the period after working hours until dark. Jeff Prucher

1 0

Time Zone change in Venezuela (GMT -04:30) will be postponed for 2-3 weeks
by Alex Krivenyshev 27 Sep '07

27 Sep '07

Time Zone change in Venezuela (GMT -04:30) will be postponed for 2-3 weeks ... http://opinion.eluniversal.com/2007/08/21/pol_ava_ministro-navarro:- es_21A935917.shtml http://www.worldtimezone.com/dst_news/dst_news_venezuela04.html Alex Krivenyshev, WTZ.com http://www.worldtimezone.com/dst_news/ New York, NY

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El Salvador
by Bobby Rullo 26 Sep '07

26 Sep '07

Hello, I have written a timezone library (including a parser) in JavaScript and am running into a bit of confusion with this particular Zone and Rule: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D Rule Salv 1987 1988 - Sep lastSun 0:00 0 S # There are too many San Salvadors elsewhere, so use America/El_Salvador # instead of America/San_Salvador. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador -6:00 Salv C%sT My question is, what is the applicable Rule for any date after 1988? The last "Salv" Rule ends in 1988, and the Zone states that Salv is the Rule from 1921 on (no UNTIL specified) I've done a "man zic" hoping to see something like "If there is no applicable Rule, just use the basic offset and assume that the LETTER is 'S'", but I could not find anything like that. Is that the correct behavior? Thanks Bobby

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5 Indiana counties are going back to Eastern Time zone- no clocks change after Nov 4, 2007
by Alex Krivenyshev 26 Sep '07

26 Sep '07

U.S. DOT announced that five Indiana counties (Daviess, Dubois, Knox, Martin and Pike) are moving from Central to Eastern time- keep their clocks unchange after November 4, 2007. http://www.worldtimezone.com/dst_news/dst_news_usa02.html http://www.courierpress.com/news/2007/sep/20/some-counties-get-ok-move-back- eastern-time-zone/ Alex Krivenyshev, WTZ.com http://www.worldtimezone.com/dst_news/ New York, NY

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