An optional update is available to update the Daylight Saving Time for Bangladesh for the year 2009 for Windows XP, Windows Server 2003, Windows Vista and Windows Server 2008 based computers
According to an announcement from the Bangladesh government, the Bangladesh cabinet has decided to advance Bangladesh Standard Time by one hour from 23:00:00 June 19th to save electricity during evening peak hours. The clock will move one hour forward at 23:00:00 on June 19th. No DST end date has been announced yet. There was no DST for Bangladesh prior to this announcement.
Please be aware that if the government of Bangladesh determines an end date for DST after this KB has been published, that DST End date will not be reflected in this Microsoft Fix it solution.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB972423.