With 2009n, zdump shows that DST was introduced for 2009 and does not
continue beyond 2009, and shows UTC+6 for non-DST (21600 seconds), and
UTC+7 for DST (25200 seconds):

$ zdump -v -c 2007,2015 Asia/Dhaka
Asia/Dhaka  Fri Jun 19 16:59:59 2009 UTC = Fri Jun 19 22:59:59 2009 BDT isdst=0 
gmtoff=21600
Asia/Dhaka  Fri Jun 19 17:00:00 2009 UTC = Sat Jun 20 00:00:00 2009 BDST 
isdst=1 gmtoff=25200
Asia/Dhaka  Thu Dec 31 16:59:59 2009 UTC = Thu Dec 31 23:59:59 2009 BDST 
isdst=1 gmtoff=25200
Asia/Dhaka  Thu Dec 31 17:00:00 2009 UTC = Thu Dec 31 23:00:00 2009 BDT isdst=0 
gmtoff=21600

With 2009o, the bug manifests so that DST is not considered at all:

$ zdump -v -c 2007,2015 Asia/Dhaka
Asia/Dhaka  Fri Jun 19 16:59:59 2009 UTC = Fri Jun 19 22:59:59 2009 BDT isdst=0 
gmtoff=21600
Asia/Dhaka  Fri Jun 19 17:00:00 2009 UTC = Fri Jun 19 23:00:00 2009 BDST 
isdst=0 gmtoff=21600


Meh, sorry for the mess. Should have checked that earlier.

-- 
2009o available
https://bugs.launchpad.net/bugs/456322
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