First a note that tzdata2009i.tar.gz does seem to do the expected thing here on the mother system: Script started on Mon Jun 15 06:34:58 2009 lecserver$ ./zdump -v Asia/Dhaka | grep 2009 Asia/Dhaka Fri Jun 19 17:59:59 2009 UTC = Fri Jun 19 23:59:59 2009 BDT isdst=0 Asia/Dhaka Fri Jun 19 18:00:00 2009 UTC = Sat Jun 20 01:00:00 2009 BDST isdst=1 lecserver$ exit script done on Mon Jun 15 06:35:15 2009 However, given this morning's note about DST starting at 23:00... Finally we've got the official mail regarding DST start time where DST start time is mentioned as Jun 19 2009, 23:00 from BTRC (Bangladesh Telecommunication Regulatory Commission). No DST end date has been announced yet. ...and as a way to both simplify the change and avoid glitches, below find a proposed change to the "asia" file. Feedback both on the usefulness of the change and when to push it is welcome. --ado ------- asia ------- *** /tmp/geta26023 Mon Jun 15 06:44:15 2009 --- /tmp/getb26023 Mon Jun 15 06:44:15 2009 *************** *** 1,5 **** # <pre> ! # @(#)asia 8.34 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,5 ---- # <pre> ! # @(#)asia 8.35 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 165,173 **** # 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 --- 165,176 ---- # http://www.timeanddate.com/news/time/bangladesh-daylight-saving-2009.html # </a> ! # From A. N. M. Kamrus Saadat (2009-06-15): ! # Finally we've got the official mail regarding DST start time where DST start ! # time is mentioned as Jun 19 2009, 23:00 from BTRC (Bangladesh ! # Telecommunication Regulatory Commission). ! # ! # No DST end date has been announced yet. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Dhaka 6:01:40 - LMT 1890 *************** *** 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] --- 179,186 ---- 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]