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Understanding the Bangladesh change
by Dave Rolsky June 8, 2009

June 8, 2009

So I went to update my Perl package based on the Olson database this morning, and my tests are blowing up. The problem is that I don't have any code to handle the current Bangladesh situation. If I'm reading the database correctly, it says that there is a change scheduled for 2009, but then there's nothing scheduled for future years. Does that mean that 2010+ are considered unknown and uncalculatable? That seems somewhat problematic. I can't be the only one who expects to be able to use the Olson database to calculate future dates. -dave /*============================================================ http://VegGuide.org http://blog.urth.org Your guide to all that's veg House Absolute(ly Pointless) ============================================================*/

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tzcode2009i.tar.gz and tzdata2009i.tar.gz
by Olson, Arthur David (NIH/NCI) [E] June 8, 2009

June 8, 2009

The files... ftp://elsie.nci.nih.gov/pub/tzcode2009i.tar.gz ...and... ftp://elsie.nci.nih.gov/pub/tzdata2009i.tar.gz ...are now available; these reflect the changes circulated last week on the time zone mailing list (most importantly, updating for DST in Bangladesh this year). --ado

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Re: proposed time zone package change for Bangladesh
by Arthur David Olson June 6, 2009

June 6, 2009

Here's an updated proposed change, reflecting the information from Steffen Thorsen. The "asia" differences are against the current ftpable version. We'll need to revisit Bangladesh once the 2009 end date is determined. I've also added Eric Muller's tz-link.htm update. Barring problems, these will show up in the ftpable version on 2009-06-08. --ado ------- tz-link.htm ------- *** /tmp/geta9713 Tue Jun 2 09:31:42 2009 --- /tmp/getb9713 Tue Jun 2 09:31:42 2009 *************** *** 18,24 **** <body> <h1>Sources for Time Zone and Daylight Saving Time Data</h1> <address> ! @(#)tz-link.htm 8.19 </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 8.20 </address> <p> This file is in the public domain, so clarified as of *************** *** 360,367 **** </ul> <h2>Time zone boundaries</h2> <ul> ! <li><a href="http://efele.net/maps/tz/us/">A map of the TZ timezones in ! the US</a> contains a <a href="http://en.wikipedia.org/wiki/Shapefile">shapefile</a> of the <code>tz</code> regions in the US.</li> <li><a href="http://statoids.com/statoids.html">Administrative Divisions --- 360,366 ---- </ul> <h2>Time zone boundaries</h2> <ul> ! <li><a href="http://efele.net/maps/tz/">TZ timezone maps</a> contains a <a href="http://en.wikipedia.org/wiki/Shapefile">shapefile</a> of the <code>tz</code> regions in the US.</li> <li><a href="http://statoids.com/statoids.html">Administrative Divisions ------- asia ------- *** /tmp/geta9946 Tue Jun 2 09:41:11 2009 --- /tmp/getb9946 Tue Jun 2 09:41:11 2009 *************** *** 1,5 **** # <pre> ! # @(#)asia 8.32 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,5 ---- # <pre> ! # @(#)asia 8.34 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 127,132 **** --- 127,174 ---- 3:00 - AST # Bangladesh + # From Alexander Krivenyshev (2009-05-13): + # According to newspaper Asian Tribune (May 6, 2009) Bangladesh may introduce + # Daylight Saving Time from June 16 to Sept 30 + # + # Bangladesh to introduce daylight saving time likely from June 16 + # <a href="http://www.asiantribune.com/?q=node/17288"> + # http://www.asiantribune.com/?q=node/17288 + # </a> + # or + # <a href="http://www.worldtimezone.com/dst_news/dst_news_bangladesh02.html"> + # http://www.worldtimezone.com/dst_news/dst_news_bangladesh02.html + # </a> + # + # "... Bangladesh government has decided to switch daylight saving time from + # June + # 16 till September 30 in a bid to ensure maximum use of daylight to cope with + # crippling power crisis. " + # + # The switch will remain in effect from June 16 to Sept 30 (2009) but if + # implemented the next year, it will come in force from April 1, 2010 + + # From Steffen Thorsen (2009-06-02): + # They have finally decided now, but changed the start date to midnight between + # the 19th and 20th, and they have not set the end date yet. + # + # Some sources: + # <a href="http://in.reuters.com/article/southAsiaNews/idINIndia-40017620090601"> + # http://in.reuters.com/article/southAsiaNews/idINIndia-40017620090601 + # </a> + # <a href="http://bdnews24.com/details.php?id=85889&cid=2"> + # http://bdnews24.com/details.php?id=85889&cid=2 + # </a> + # + # Our wrap-up: + # <a href="http://www.timeanddate.com/news/time/bangladesh-daylight-saving-2009.html"> + # http://www.timeanddate.com/news/time/bangladesh-daylight-saving-2009.html + # </a> + + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Bang 2009 only - Jan 1 0:00 0 - + Rule Bang 2009 only - Jun 20 0:00 1:00 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Dhaka 6:01:40 - LMT 1890 5:53:20 - HMT 1941 Oct # Howrah Mean Time? *************** *** 134,140 **** 5:30 - IST 1942 Sep 6:30 - BURT 1951 Sep 30 6:00 - DACT 1971 Mar 26 # Dacca Time ! 6:00 - BDT # Bangladesh Time # Bhutan # Zone NAME GMTOFF RULES FORMAT [UNTIL] --- 176,183 ---- 5:30 - IST 1942 Sep 6:30 - BURT 1951 Sep 30 6:00 - DACT 1971 Mar 26 # Dacca Time ! 6:00 - BDT 2009 # Bangladesh Time ! 6:00 Bang BD%sT # Bhutan # Zone NAME GMTOFF RULES FORMAT [UNTIL]

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tzdata mirror no longer found (in tz-link.htm)
by Nathan Stratton Treadway June 5, 2009

June 5, 2009

I noticed that tz-link.htm file currently (as of the version in tzcode2009h.tar.gz) includes a link labeled "smaller HTTP mirror" to http://public.planetmirror.com/pub/timezone However, when I follow that link, the resulting page does not actually contain any timezone-related files -- and in fact after looking around a bit I didn't see any indication that the site still contains a separate mirror for the "upstream" timezone database. (Using the provided search box to search for the word "tzdata" returned only links related to the CentOS mirror that is hosted on the site.) On a separate-but-related topic: I'm not sure how the http://www.twinsun.com/tz/tz-link.htm web page is normally maintained, but I noticed that while the tzcode2009h file's version of the file contains a version stamp of "8.19", the version posted on twinsun is only "8.15". I mention this especially because the page is referenced in many places as the "home URL" of the timezone database project, so it seems like it would be worth trying to keep it as up-to-date as possible.... (The tz-arts.htm file on the twinsun site is also a few revions behind the current tzcode version, for what it's worth.) Thanks. Nathan ---------------------------------------------------------------------------- Nathan Stratton Treadway - nathanst(a)ontko.com - Mid-Atlantic region Ray Ontko & Co. - Software consulting services - http://www.ontko.com/ GPG Key: http://www.ontko.com/~nathanst/gpg_key.txt ID: 1023D/ECFB6239 Key fingerprint = 6AD8 485E 20B9 5C71 231C 0C32 15F3 ADCD ECFB 6239

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No DST in Mauritius the coming summer
by Steffen Thorsen June 5, 2009

June 5, 2009

According to several sources, Mauritius will not continue to observe DST the coming summer, which means that the current "max" rules for Mauritius should probably be changed to "only" rules. Some sources, in French: http://www.defimedia.info/news/946/Rashid-Beebeejaun-:-%C2%AB-L%E2%80%99heu… http://lexpress.mu/Story/3398~Beebeejaun---Les-objectifs-d-%C3%A9conomie-d-… Our wrap-up: http://www.timeanddate.com/news/time/mauritius-dst-will-not-repeat.html Regards, Steffen Thorsen - timeanddate.com

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When a official time changes what's happend in real time ?
by S�bastien WILLEMIJNS June 2, 2009

June 2, 2009

Hello, When a TZ change in France in the middle of the night i sleep so i have never see if hour change in real time... I see on http://en.wikipedia.org/wiki/Network_Time_Protocol#Microsoft_Windows than W32TIME can have an 1-2 second error.. is http://www.meinberg.de/english/sw/ntp.htm is more precise ? Have a nice day/night ;)

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update to tz-link.htm
by Eric Muller June 2, 2009

June 2, 2009

When there is a good opportunity: *** tz-link.htm Sun May 17 11:44:05 2009 --- tz-link.htm.new Tue Jun 2 03:00:11 2009 *************** but the maps are more up to date.</li> *** 360,369 **** </ul> <h2>Time zone boundaries</h2> <ul> ! <li><a href="http://efele.net/maps/tz/us/">A map of the TZ timezones in ! the US</a> contains a <a href="http://en.wikipedia.org/wiki/Shapefile">shapefile</a> of the ! <code>tz</code> regions in the US.</li> <li><a href="http://statoids.com/statoids.html">Administrative Divisions of Countries ("Statoids")</a> contains detailed lists of <code>tz</code>-related zone subdivision data.</li> --- 360,368 ---- </ul> <h2>Time zone boundaries</h2> <ul> ! <li><a href="http://efele.net/maps/tz/">TZ timezones maps</a> contains a <a href="http://en.wikipedia.org/wiki/Shapefile">shapefile</a> of the ! <code>tz</code> regions in the world.</li> <li><a href="http://statoids.com/statoids.html">Administrative Divisions of Countries ("Statoids")</a> contains detailed lists of <code>tz</code>-related zone subdivision data.</li> Thanks, Eric.

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proposed time zone package change for Bangladesh
by Arthur David Olson June 2, 2009

June 2, 2009

With June 16 looming and no better information available, here's a proposed change to the "asia" file to reflect use of DST in Bangladesh this year. If no problems are found, expect the ftpable file to be updated 2009-06-08. --ado ------- asia ------- *** /tmp/geta6499 Mon Jun 1 21:55:59 2009 --- /tmp/getb6499 Mon Jun 1 21:55:59 2009 *************** *** 1,5 **** # <pre> ! # @(#)asia 8.32 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,5 ---- # <pre> ! # @(#)asia 8.33 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 127,132 **** --- 127,155 ---- 3:00 - AST # Bangladesh + # From Alexander Krivenyshev (2009-05-13): + # According to newspaper Asian Tribune (May 6, 2009) Bangladesh may introduce + # Daylight Saving Time from June 16 to Sept 30 + # + # Bangladesh to introduce daylight saving time likely from June 16 + # <a href="http://www.asiantribune.com/?q=node/17288"> + # http://www.asiantribune.com/?q=node/17288 + # </a> + # or + # <a href="http://www.worldtimezone.com/dst_news/dst_news_bangladesh02.html"> + # http://www.worldtimezone.com/dst_news/dst_news_bangladesh02.html + # </a> + # + # "... Bangladesh government has decided to switch daylight saving time from + # June + # 16 till September 30 in a bid to ensure maximum use of daylight to cope with + # crippling power crisis. " + # + # The switch will remain in effect from June 16 to Sept 30 (2009) but if + # implemented the next year, it will come in force from April 1, 2010 + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Bang 2009 only - Jun 16 0:00 1:00 S + Rule Bang 2009 only - Oct 1 0:00s 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Dhaka 6:01:40 - LMT 1890 5:53:20 - HMT 1941 Oct # Howrah Mean Time? *************** *** 134,140 **** 5:30 - IST 1942 Sep 6:30 - BURT 1951 Sep 30 6:00 - DACT 1971 Mar 26 # Dacca Time ! 6:00 - BDT # Bangladesh Time # Bhutan # Zone NAME GMTOFF RULES FORMAT [UNTIL] --- 157,164 ---- 5:30 - IST 1942 Sep 6:30 - BURT 1951 Sep 30 6:00 - DACT 1971 Mar 26 # Dacca Time ! 6:00 - BDT 2009 # Bangladesh Time ! 6:00 Bang BD%sT # Bhutan # Zone NAME GMTOFF RULES FORMAT [UNTIL]

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Bangladesh may introduce Daylight Saving Time from June 16 to Sept 30, 2009
by Alexander Krivenyshev May 27, 2009

May 27, 2009

According to newspaper Asian Tribune (May 6, 2009) Bangladesh may introduce Daylight Saving Time from June 16 to Sept 30 Bangladesh to introduce daylight saving time likely from June 16 http://www.asiantribune.com/?q=node/17288 or http://www.worldtimezone.com/dst_news/dst_news_bangladesh02.html "... Bangladesh government has decided to switch daylight saving time from June 16 till September 30 in a bid to ensure maximum use of daylight to cope with crippling power crisis. " The switch will remain in effect from June 16 to Sept 30 (2009) but if implemented the next year, it will come in force from April 1, 2010 Alexander Krivenyshev, http://www.worldtimezone.com

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New APIs to allow conversion of times in arbitrary zones
by Guy Harris May 26, 2009

May 26, 2009

For the benefit of programs such as world clocks and any other program that would need to convert times in an arbitrary zone specified by a TZ setting, I've added some APIs to load time zone information for a specified zone, free that time zone information, and convert between time_t and struct tm in specified zones: zoneinfo_t loadzone(const char *zonename) Attempts to allocate and fill in a structure to hold information for the time zone specified by "zonename"; returns a pointer to the time zone information on success and NULL on failure. void freezone(zoneinfo_t zoneinfo) Frees zone information returned by loadzone(). struct tm *localtime_zr(const time *clock, struct tm *result, zoneinfo_t zoneinfo) Like localtime_r(), but does the conversion in the time zone specified by zoneinfo. time_t mktime_z(struct tm *timeptr) Like mktime(), but does the conversion in the time zone specified by zoneinfo. zoneinfo_t is implemented, internally, as a pointer to a "struct state", but it's opaque to the callers. I'm not committed to any of the names, or the order of the arguments; for example, "loadzone()" doesn't necessarily load information from a file - it might parse a POSIX-style TZ string - so that might not be the right name. The new functions are declared in an "xtime.h" public header (the name was inspired by the BSD "xlocale.h" header that declares functions such as printf_l() which take a locale information pointer as an argument). See the attached patch and "xtime.h" file.

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