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problem with java tz database
by Mamun Shaheed Dec. 31, 2009

Dec. 31, 2009

Dear all, I was trying to modify the tzdatabase ($JRE_HOME/lib/zi/*) for JRE, but could not make it sucess. Here is what I have done so far... 1. Downloaded the code and latest tzdata from ftp://elsie.nci.nih.gov/pub/. 2. Modified the asia file and insert my rule there. 3. compile the file with zic. 4. copy the compiled file and put in in $JRE_HOME/lib/zi/Asia/ of my windows pcs 5. run the DSTTest file available in sun.com to check the time zone and got following error C:\Program Files\Java\jre1.5.0_06\bin>java DSTTest "12/30/2009 1:00 AM" ZoneInfo: wrong magic number: Asia/Dhaka ZoneInfo: wrong magic number: Asia/Dhaka JRE version : 1.5.0_06 Wed Dec 30 01:00:00 GMT 2009 TimeZone tested : Greenwich Mean Time Your tested time is not in daylight-savings time. C:\Program Files\Java\jre1.5.0_06\bin> Please help me. Mamun

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tzdata2009u
by Olson, Arthur David (NIH/NCI) [E] Dec. 29, 2009

Dec. 29, 2009

The file... ftp://elsie.nci.nih.gov/pub/tzdata2009u.tar.gz ...is now available; this incorporates changes to DST in Bangladesh. I expect tzdata2010a.tar.gz (reflecting changes in Mexico) early next year. --ado

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Re: proposed changes to time zone "asia" file for Bangladesh
by Arthur David Olson Dec. 26, 2009

Dec. 26, 2009

At Danvin Ruangchan's suggestion, here's the proposed change to Bangladesh as a rule. --ado ------- asia ------- *** /tmp/geta10467 Sat Dec 26 08:26:16 2009 --- /tmp/getb10467 Sat Dec 26 08:26:16 2009 *************** *** 1,4 **** ! # @(#)asia 8.48 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,4 ---- ! # @(#)asia 8.50 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 196,201 **** --- 196,236 ---- # http://www.thaindian.com/newsportal/business/bangladesh-to-continue-indefin… # </a> + # From Alexander Krivenyshev (2009-12-24): + # According to Bangladesh newspaper "The Daily Star," + # Bangladesh will change its clock back to Standard Time on Dec 31, 2009. + # + # Clock goes back 1-hr on Dec 31 night. + # <a href="http://www.thedailystar.net/newDesign/news-details.php?nid=119228"> + # http://www.thedailystar.net/newDesign/news-details.php?nid=119228 + # </a> + # and + # <a href="http://www.worldtimezone.com/dst_news/dst_news_bangladesh05.html"> + # http://www.worldtimezone.com/dst_news/dst_news_bangladesh05.html + # </a> + # + # "...The government yesterday decided to put the clock back by one hour + # on December 31 midnight and the new time will continue until March 31, + # 2010 midnight. The decision came at a cabinet meeting at the Prime + # Minister's Office last night..." + + # From Danvin Ruangchan (2009-12-24): + # ...the news mentions DST will be turned off again 7 months after March + # 31st on Oct 31, 2010. + + # From Arthur David Olson (2009-12-26): + # Indeed, "The government will advance again the Banglasdesh Standard + # Time by one one hour on March 31 next year by enforcing the Daylight + # Saving Time (DST) for seven months. It will continue till October 31 + # until further notice." I take that last sentence as the + # establishment of a rule. + + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Dhaka 2009 only - Jun 29 23:00 1 S + Rule Dhaka 2010 only - Jan 1 0:00 - - + Rule Dhaka 2010 max - Mar 31 23:00 1 S + Rule Dhaka 2010 max - Nov 1 0:00 - - + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Dhaka 6:01:40 - LMT 1890 5:53:20 - HMT 1941 Oct # Howrah Mean Time? *************** *** 203,210 **** 5:30 - IST 1942 Sep 6:30 - BURT 1951 Sep 30 6:00 - DACT 1971 Mar 26 # Dacca Time ! 6:00 - BDT 2009 Jun 19 23:00 # Bangladesh Time ! 6:00 1:00 BDST # Bhutan # Zone NAME GMTOFF RULES FORMAT [UNTIL] --- 238,245 ---- 5:30 - IST 1942 Sep 6:30 - BURT 1951 Sep 30 6:00 - DACT 1971 Mar 26 # Dacca Time ! 6:00 - BDT 2009 ! 6:00 Dhaka BD%sT # Bhutan # Zone NAME GMTOFF RULES FORMAT [UNTIL]

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proposed changes to time zone "asia" file for Bangladesh
by Arthur David Olson Dec. 25, 2009

Dec. 25, 2009

Below are changes to the "asia" file to reflect news from Bangladesh. Since clocks are due to change with the year, these changes will appear in the ftp archive this coming Monday (2009-12-28) unless problems are found. --ado ------- asia ------- *** /tmp/geta5692 Thu Dec 24 18:00:10 2009 --- /tmp/getb5692 Thu Dec 24 18:00:10 2009 *************** *** 1,4 **** ! # @(#)asia 8.48 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,4 ---- ! # @(#)asia 8.49 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 196,201 **** --- 196,219 ---- # http://www.thaindian.com/newsportal/business/bangladesh-to-continue-indefin… # </a> + # From Alexander Krivenyshev (2009-12-24): + # According to Bangladesh newspaper "The Daily Star," + # Bangladesh will change its clock back to Standard Time on Dec 31, 2009. + # + # Clock goes back 1-hr on Dec 31 night. + # <a href="http://www.thedailystar.net/newDesign/news-details.php?nid=119228"> + # http://www.thedailystar.net/newDesign/news-details.php?nid=119228 + # </a> + # and + # <a href="http://www.worldtimezone.com/dst_news/dst_news_bangladesh05.html"> + # http://www.worldtimezone.com/dst_news/dst_news_bangladesh05.html + # </a> + # + # "...The government yesterday decided to put the clock back by one hour + # on December 31 midnight and the new time will continue until March 31, + # 2010 midnight. The decision came at a cabinet meeting at the Prime + # Minister's Office last night..." + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Dhaka 6:01:40 - LMT 1890 5:53:20 - HMT 1941 Oct # Howrah Mean Time? *************** *** 204,209 **** --- 222,229 ---- 6:30 - BURT 1951 Sep 30 6:00 - DACT 1971 Mar 26 # Dacca Time 6:00 - BDT 2009 Jun 19 23:00 # Bangladesh Time + 6:00 1:00 BDST 2010 + 6:00 - BDT 2010 Apr 6:00 1:00 BDST # Bhutan

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Bangladesh back to Standard Time on Dec 31, 2009
by Alexander Krivenyshev Dec. 24, 2009

Dec. 24, 2009

According to Bangladesh newspaper "The Daily Star", Bangladesh will change its clock back to Standard Time on Dec 31, 2009. Clock goes back 1-hr on Dec 31 night. http://www.thedailystar.net/newDesign/news-details.php?nid=119228 and http://www.worldtimezone.com/dst_news/dst_news_bangladesh05.html " ....The government yesterday decided to put the clock back by one hour on December 31 midnight and the new time will continue until March 31, 2010 midnight.The decision came at a cabinet meeting at the Prime Minister's Office last night. ..." Alexander Krivenyshev, http://www.WorldTimeZone.com

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2009t
by Olson, Arthur David (NIH/NCI) [E] Dec. 21, 2009

Dec. 21, 2009

The files... ftp://elsie.nci.nih.gov/pub/tzcode2009t.tar.gz ...and... ftp://elsie.nci.nih.gov/pub/tzdata2009t.tar.gz ...are now available; these reflect the changes circulated last week on the time zone mailing list. --ado

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London and Dublin zone definitions
by Danvin Ruangchan Dec. 17, 2009

Dec. 17, 2009

Hey all, Is there a reason why the Europe/London and Europe/Dublin Zone definitions are outside the "Europe" section that starts on line # 449 in the "europe" data file? For consistency sake, shouldn't those two sections be moved under the "Europe" section where the DST Rule for "EU" is defined? thanks danvin

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Help With Understanding the Binary Files
by Bill Seymour Dec. 14, 2009

Dec. 14, 2009

Could somebody please help me interpret the tz binary files? I'm having trouble understanding what to do with the two arrays that follow the leap second array. 1. tzfile.h says that they're "indexed by type"; but I don't see anything in the "type" (which I take to mean what tzfile.5 calls "struct ttinfo") that could be used as such an index. Does "indexed by type" mean "having the same index as the type", in other words, the value from the array following the transition time array? 2. tzfile.h seems to imply that these booleans indicate how I should interpret the values in the array of transition times. Is that correct? If so, how do I calculate standard time while DST is being observed given that the SAVE column in the Rule has been lost? Do I assume that the offset for DST is always exactly 1 hour? What about solar89, etc.? 3. tzfile.5 says that these "are used when a time zone file is used in handling POSIX-style time zone environment variables." Does that mean that the "transition times" are the ones in the TZ variable, not the array of transition times in the file (so my question 2 is moot)? I'm very confused. 8-( Thanks, --Bill Seymour

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proposed time zone package changes
by Arthur David Olson Dec. 12, 2009

Dec. 12, 2009

Below are proposed changes to the time zone package; none of these changes affect binary files. The executive summary: Theory "Calendrical Calculations" updated (thanks to Steve Ward). asia Hong Kong comments corrected; Xinjiang comments added. europe Russian region comments updated (thanks to Oscar van Vlijmen) tz-art.htm Added Luciana Souza's "Tide." tz-link.htm Added "Simple Timer + Clocks" (thanks to George Bradt). tzfile.5 Typo fixed (thanks to Steve Ward). zone.tab version change only If no problems are found, these changes will appear in the ftpable packages on 2009-12-21. --ado diff -r -c old/Theory new/Theory *** old/Theory Wed Oct 21 09:12:41 2009 --- new/Theory Sat Dec 12 09:11:32 2009 *************** *** 1,4 **** ! @(#)Theory 8.3 This file is in the public domain, so clarified as of 2009-05-17 by Arthur David Olson. --- 1,4 ---- ! @(#)Theory 8.4 This file is in the public domain, so clarified as of 2009-05-17 by Arthur David Olson. *************** *** 360,369 **** Calendrical issues are a bit out of scope for a time zone database, but they indicate the sort of problems that we would run into if we extended the time zone database further into the past. An excellent ! resource in this area is Edward M. Reingold and Nachum Dershowitz, ! <a href="http://emr.cs.uiuc.edu/home/reingold/calendar-book/second-edition/"> ! Calendrical Calculations: The Millennium Edition ! </a>, Cambridge University Press (2001). Other information and sources are given below. They sometimes disagree. --- 360,369 ---- Calendrical issues are a bit out of scope for a time zone database, but they indicate the sort of problems that we would run into if we extended the time zone database further into the past. An excellent ! resource in this area is Nachum Dershowitz and Edward M. Reingold, ! <a href="http://emr.cs.iit.edu/home/reingold/calendar-book/third-edition/"> ! Calendrical Calculations: Third Edition ! </a>, Cambridge University Press (2008). Other information and sources are given below. They sometimes disagree. diff -r -c old/asia new/asia *** old/asia Thu Oct 29 07:12:14 2009 --- new/asia Sat Dec 12 08:39:40 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 8.48 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 363,368 **** --- 363,431 ---- # 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.) + Zone Asia/Kashgar 5:03:56 - LMT 1928 # or Kashi or Kaxgar 5:30 - KAST 1940 # Kashgar Time 5:00 - KAST 1980 May *************** *** 370,377 **** # 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, # it is not [an] observatory, but the official meteorological agency of HK, # and also serves as the official timing agency), there are some missing # and incorrect rules. Although the exact switch over time is missing, I --- 433,440 ---- # From Lee Yiu Chung (2009-10-24): ! # I found there are some mistakes for the...DST rule for Hong ! # Kong. [According] to the DST record from Hong Kong Observatory (actually, # it is not [an] observatory, but the official meteorological agency of HK, # and also serves as the official timing agency), there are some missing # and incorrect rules. Although the exact switch over time is missing, I diff -r -c old/europe new/europe *** old/europe Thu Oct 29 07:14:18 2009 --- new/europe Sat Dec 12 10:02:17 2009 *************** *** 1,5 **** # <pre> ! # @(#)europe 8.24 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,5 ---- # <pre> ! # @(#)europe 8.25 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 2130,2141 **** # From Oscar van Vlijmen (2003-10-18): [This region consists of] # Aginskij Buryatskij avtonomnyj okrug, Amurskaya oblast', # [parts of] Respublika Sakha (Yakutiya), Chitinskaya oblast'. # The Sakha districts are: Aldanskij, Amginskij, Anabarskij, ! # Bulunskij, Verkhnekolymskij, Verkhnevilyujskij, Vilyujskij, Gornyj, # Zhiganskij, Kobyajskij, Lenskij, Megino-Kangalasskij, Mirninskij, ! # Namskij, Nyurbinskij, Olenekskij, Olekminskij, Srednekolymskij, # Suntarskij, Tattinskij, Ust'-Aldanskij, Khangalasskij, ! # Churapchinskij, Eveno-Bytantajskij. Zone Asia/Yakutsk 8:38:40 - LMT 1919 Dec 15 8:00 - YAKT 1930 Jun 21 # Yakutsk Time 9:00 Russia YAK%sT 1991 Mar 31 2:00s --- 2130,2149 ---- # From Oscar van Vlijmen (2003-10-18): [This region consists of] # Aginskij Buryatskij avtonomnyj okrug, Amurskaya oblast', # [parts of] Respublika Sakha (Yakutiya), Chitinskaya oblast'. + + # From Oscar van Vlijmen (2009-11-29): + # ...some regions of RUssia were merged with others since 2005... + # Some names were changed, no big deal, except for one instance: a new name. + # YAK/YAKST: UTC+9 Zabajkal'skij kraj. + + # From Oscar van Vlijmen (2009-11-29): # The Sakha districts are: Aldanskij, Amginskij, Anabarskij, ! # Verkhnevilyujskij, Vilyujskij, Gornyj, # Zhiganskij, Kobyajskij, Lenskij, Megino-Kangalasskij, Mirninskij, ! # Namskij, Nyurbinskij, Olenyokskij, Olyokminskij, # Suntarskij, Tattinskij, Ust'-Aldanskij, Khangalasskij, ! # Churapchinskij, Eveno-Bytantajskij Natsional'nij. ! Zone Asia/Yakutsk 8:38:40 - LMT 1919 Dec 15 8:00 - YAKT 1930 Jun 21 # Yakutsk Time 9:00 Russia YAK%sT 1991 Mar 31 2:00s *************** *** 2145,2151 **** # From Oscar van Vlijmen (2003-10-18): [This region consists of] # Evrejskaya avtonomnaya oblast', Khabarovskij kraj, Primorskij kraj, # [parts of] Respublika Sakha (Yakutiya). ! # The Sakha districts are: Verkhoyanskij, Tomponskij, Ust'-Majskij, # Ust'-Yanskij. Zone Asia/Vladivostok 8:47:44 - LMT 1922 Nov 15 9:00 - VLAT 1930 Jun 21 # Vladivostok Time --- 2153,2161 ---- # From Oscar van Vlijmen (2003-10-18): [This region consists of] # Evrejskaya avtonomnaya oblast', Khabarovskij kraj, Primorskij kraj, # [parts of] Respublika Sakha (Yakutiya). ! ! # From Oscar van Vlijmen (2009-11-29): ! # The Sakha districts are: Bulunskij, Verkhoyanskij, Tomponskij, Ust'-Majskij, # Ust'-Yanskij. Zone Asia/Vladivostok 8:47:44 - LMT 1922 Nov 15 9:00 - VLAT 1930 Jun 21 # Vladivostok Time *************** *** 2166,2173 **** # From Oscar van Vlijmen (2003-10-18): [This region consists of] # Magadanskaya oblast', Respublika Sakha (Yakutiya). # Probably also: Kuril Islands. ! # The Sakha districts are: Abyjskij, Allaikhovskij, Momskij, ! # Nizhnekolymskij, Ojmyakonskij. Zone Asia/Magadan 10:03:12 - LMT 1924 May 2 10:00 - MAGT 1930 Jun 21 # Magadan Time 11:00 Russia MAG%sT 1991 Mar 31 2:00s --- 2176,2185 ---- # From Oscar van Vlijmen (2003-10-18): [This region consists of] # Magadanskaya oblast', Respublika Sakha (Yakutiya). # Probably also: Kuril Islands. ! ! # From Oscar van Vlijmen (2009-11-29): ! # The Sakha districts are: Abyjskij, Allaikhovskij, Verkhhhnekolymskij, Momskij, ! # Nizhnekolymskij, Ojmyakonskij, Srednekolymskij. Zone Asia/Magadan 10:03:12 - LMT 1924 May 2 10:00 - MAGT 1930 Jun 21 # Magadan Time 11:00 Russia MAG%sT 1991 Mar 31 2:00s diff -r -c old/tz-art.htm new/tz-art.htm *** old/tz-art.htm Wed Oct 28 13:19:00 2009 --- new/tz-art.htm Sat Dec 12 10:04:50 2009 *************** *** 9,15 **** <body> <h1>Time and the Arts</h1> <address> ! @(#)tz-art.htm 8.14 </address> <p> This file is in the public domain, so clarified as of --- 9,15 ---- <body> <h1>Time and the Arts</h1> <address> ! @(#)tz-art.htm 8.15 </address> <p> This file is in the public domain, so clarified as of *************** *** 227,233 **** --- 227,245 ---- <tr><td><a href="http://www.allmusic.com/cg/amg.dll?p=amg&sql=10:gifqxqt5ld0e">AMG Rating</a></td><td>4.5 stars</td></tr> <tr><td>ADO Rating</td><td>1.5 stars</td></tr> <tr><td>Notes<td>The title song is also available on "Bob Dylan's Greatest Hits" and "The Essential Bob Dylan."</td></tr> + <tr><td> </td></tr> + <tr><td>Artist</td><td>Luciana Souza</td></tr> + <tr><td>CD</td><td>Tide</td></tr> + <tr><td>Copyright Date</td><td>2009</td></tr> + <tr><td>Label</td><td>Universal Jazz France</td></tr> + <tr><td>ID</td><td>B0012688-02</td></tr> + <tr><td>Total Time</td><td>42:31</td></tr> + <tr><td><a href="http://www.allmusic.com/cg/amg.dll?p=amg&sql=10:3bftxzw0ldhe"</a>AMG Rating</a></td><td>3.5 stars</td></tr> + <tr><td>ADO Rating</td><td>2.5 stars</td></tr> + <tr><td>Notes<td>Includes the song "Fire and Wood" with the lyric + "The clocks were turned back you remeber/Think it's still November." + </td></tr> <tr><td> </td></tr> <tr><td>TV episode title</td><td>The Lost Hour</td> diff -r -c old/tz-link.htm new/tz-link.htm *** old/tz-link.htm Wed Nov 4 10:00:47 2009 --- new/tz-link.htm Sat Dec 12 09:39:02 2009 *************** *** 18,24 **** <body> <h1>Sources for Time Zone and Daylight Saving Time Data</h1> <address> ! @(#)tz-link.htm 8.23 </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 8.24 </address> <p> This file is in the public domain, so clarified as of *************** *** 149,154 **** --- 149,157 ---- <li>The <a href="http://worldtimeengine.com/">World Time Engine</a> also contains data about time zone boundaries; it supports queries via place names and shows location maps.</li> + <li><a href="http://simpletimerclocks.mozdev.org/">Simple Timer + Clocks</a> + is a Firefox add-on which uses a timezone data file generated from the + tz data files.</li> </ul> <h2>Other time zone database formats</h2> <ul> diff -r -c old/tzfile.5 new/tzfile.5 *** old/tzfile.5 Wed Oct 21 09:12:42 2009 --- new/tzfile.5 Sat Dec 12 09:05:09 2009 *************** *** 7,13 **** .SH DESCRIPTION The time zone information files used by .IR tzset (3) ! begin with the magic characters "TZif" to identify then as time zone information files, followed by a character identifying the version of the file's format (as of 2005, either an ASCII NUL or a '2') --- 7,13 ---- .SH DESCRIPTION The time zone information files used by .IR tzset (3) ! begin with the magic characters "TZif" to identify them as time zone information files, followed by a character identifying the version of the file's format (as of 2005, either an ASCII NUL or a '2') *************** *** 147,152 **** such instants). .SH SEE ALSO newctime(3) ! .\" @(#)tzfile.5 8.2 .\" This file is in the public domain, so clarified as of .\" 1996-06-05 by Arthur David Olson. --- 147,152 ---- such instants). .SH SEE ALSO newctime(3) ! .\" @(#)tzfile.5 8.3 .\" This file is in the public domain, so clarified as of .\" 1996-06-05 by Arthur David Olson. diff -r -c old/zone.tab new/zone.tab *** old/zone.tab Thu Oct 29 07:12:00 2009 --- new/zone.tab Sat Dec 12 09:57:09 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 8.31 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. #

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Question regarding America/Manaus timezone
by Alain Petit Dec. 11, 2009

Dec. 11, 2009

Hi [This is a resending due to issues with the email address I sent to. I apologize if you receive it in double] Looking into some timezone information I have the following interrogation, and I am unsure if my interpretation of the file is wrong, or if the rules are wrong... This comes from tzdata2009s, southamerica file The rules are # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Brazil 2008 max - Oct Sun>=15 0:00 1:00 S Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - The Timezone # # east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto # The great circle line from Tabatinga to Porto Acre divides # east from west Amazonas. Zone America/Manaus -4:00:04 - LMT 1914 -4:00 Brazil AM%sT 1988 Sep 12 -4:00 - AMT 1993 Sep 28 -4:00 Brazil AM%sT 1994 Sep 22 -4:00 - AMT >From what I understand from the above, America/Manaus does not observe DST ever since Sep 22, 1994. However, looking at the Microsoft Timezone definition [Dec 2009 update] for (GMT -4:00) Manaus [Central Brazilian Standard Time] the timezone observe DST from 3rd Saturday of October 23:59:59 to 3rd Saturday of February, 23:59:59. Also, another non-official site seems to imply the same: [http://www.icfsi2007.com/city_more.php will show Time Manaus Time Zone is 1 hour less than Brasilia, Sao Paulo or Rio de Janeiro Time Zone (GMT - 03:00), four hours behind of Greenwich Mean Time (GMT), except during the period between late October and the end of February, when daylight saving time is in force (GMT - 05:00 hours). ] So either a) I do not interpret the timezone rules properly for America/Manaus, and there is a DST being observed there. If so, please let me know how I should read the above rules/timezone information. b) Microsoft timezone is incorrect c) Olson data is incorrect d) The Microsoft timezone [(GMT -4:00) Manaus - Central Brazilian Standard Time] does not correspond to the Olson's America/Manaus timezone Your opinion would be appreciated Thanks -Alain Petit

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