Bug #63777 [Nab]: DateTime obj in Dec 2012 in Australia/South TZ reports 'CST' time zone abbrev

Edit report at https://bugs.php.net/bug.php?id=63777&edit=1 ID: 63777 Updated by: derick@php.net Reported by: kavi at postpro dot net Summary: DateTime obj in Dec 2012 in Australia/South TZ reports 'CST' time zone abbrev Status: Not a bug Type: Bug Package: Date/time related Operating System: OS X, CentOS, Debian PHP Version: Irrelevant Block user comment: N Private report: N New Comment: There is no CDT in use in Australia Previous Comments: ------------------------------------------------------------------------ [2013-01-07 19:34:39] kavi at postpro dot net @derick: Wow. Well, that explains it. Thanks all. ------------------------------------------------------------------------ [2013-01-07 19:33:52] kavi at postpro dot net Here's an interesting one which states CST for both summer and winter: http://www.travelmath.com/time-zone/Australia/Adelaide Another site claiming DST is in effect: http://www.timezoneconverter.com/cgi-bin/zoneinfo.tzc?tz=Australia/Adelaide So, my main question still being, if 'CST' is 'Central Summer (aka daylight savings) Time,' then what is 'CDT?' I'm happy to try to figure out where to take my irritating questions directly to IANA, BTW, if this is a) indeed a problem and b) solely an upstream problem as it appears to be. ------------------------------------------------------------------------ [2013-01-07 19:32:20] derick@php.net Olson uses CST the year round: derick@whisky:~ $ zdump -v -c 2012,2014 Australia/Adelaide Australia/Adelaide -9223372036854775808 = NULL Australia/Adelaide -9223372036854689408 = NULL Australia/Adelaide Sat Mar 31 16:29:59 2012 UTC = Sun Apr 1 02:59:59 2012 CST isdst=1 gmtoff=37800 Australia/Adelaide Sat Mar 31 16:30:00 2012 UTC = Sun Apr 1 02:00:00 2012 CST isdst=0 gmtoff=34200 Australia/Adelaide Sat Oct 6 16:29:59 2012 UTC = Sun Oct 7 01:59:59 2012 CST isdst=0 gmtoff=34200 Australia/Adelaide Sat Oct 6 16:30:00 2012 UTC = Sun Oct 7 03:00:00 2012 CST isdst=1 gmtoff=37800 Australia/Adelaide Sat Apr 6 16:29:59 2013 UTC = Sun Apr 7 02:59:59 2013 CST isdst=1 gmtoff=37800 Australia/Adelaide Sat Apr 6 16:30:00 2013 UTC = Sun Apr 7 02:00:00 2013 CST isdst=0 gmtoff=34200 Australia/Adelaide Sat Oct 5 16:29:59 2013 UTC = Sun Oct 6 01:59:59 2013 CST isdst=0 gmtoff=34200 Australia/Adelaide Sat Oct 5 16:30:00 2013 UTC = Sun Oct 6 03:00:00 2013 CST isdst=1 gmtoff=37800 Australia/Adelaide 9223372036854689407 = NULL Australia/Adelaide 9223372036854775807 = NULL The S stands for both Standard and Summer (sadly). ------------------------------------------------------------------------ [2013-01-07 19:24:13] kavi at postpro dot net As you point out from the timeanddate.com site, DST in Australia/South (Adelaide being the city I use for inquiry) ENDS April 2013, which means it started in October 2012. So it's currently daylight (not standard) time, is what I'm saying. It's either me misunderstanding the abbreviation, a bug (in Olson?) or a bug in my coffee consumption in *my* current time zone, because I don't understand. If it's something obvious I apologize for taking folks' time. ------------------------------------------------------------------------ [2013-01-07 19:18:36] rasmus@php.net Ok, it is truly not a bug. According to Olson it is CST in Adelaide now. Google, Wolfram and PHP are all in agreement here. Even that timeanddate.com page states right on it that: DST ends on Sunday, April 7, 2013 at 3:00 AM local daylight time DST starts on Sunday, October 6, 2013 at 2:00 AM local standard time So surely they should be showing DST right now. The 'S' is supposed to standard for "Standard" but people tend to use "Summer" as well. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=63777 -- Edit this bug report at https://bugs.php.net/bug.php?id=63777&edit=1