After applying 931836 time zone changes don?t take effect until you manually change the time zone
You may see systems that have successfully applied the Windows DST2007 hotfix 931836 but are still operating on old DST rules after March 11. Opening the Time/Date control panel applet and changing the time zone to a new time zone; hitting apply, and changing it back to the original time zone will often correct this problem. If this is the scenario you are seeing, you can run the following script after the hotfix is applied to automate the process of changing the time zone and ensure that the system runs with update DST2007 rules.
Update : There is another fix patch available for Windows-based applications that use the TZ environment variable may not work as expected because of changes to DST. More information available following link (http://support.microsoft.com/kb/932590/en-us)
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