It seems that the start time of Bangladesh DST is off 1 hour.
Rule Dhaka 2009 only - Jun 19 23:00 1:00 S Rule Dhaka 2010 only - Jan 1 0:00 0 - ! Rule Dhaka 2010 max - Mar 31 23:59 1:00 S ! Rule Dhaka 2010 max - Oct 31 23:59 0 -
DST will actually start at 22:59. And, newspaper below suggests that clock went back one hour at 11:59:00PM on 12-31-2009. This is actually consistent with what we heard from a customer in Bangladesh. http://www.thedailystar.net/newDesign/news-details.php?nid=119573 So the rule would look like: Rule Dhaka 2009 only - Jun 19 23:00 1:00 S Rule Dhaka 2009 only - Dec 31 23:59 0 - Rule Dhaka 2010 max - Mar 31 22:59 1:00 S Rule Dhaka 2010 max - Oct 31 23:59 0 - Best regards, -Nakano