Daylight Saving Time change the affect on computers…
The Energy Policy Act of 2005 mandated a change in daylight saving time A major change, it will be extended by four additional weeks starting in This year. The change takes effect on March 11, DST will starts three weeks earlier than usual.
If your computer is relatively new and automatically updated, you probably don’t have anything to worry about. Older operating systems may require manual updates.
Microsoft is making update tools available for Windows, Outlook, Exchange and mobile products. For more info on making the transition easier and links to utilities:
MS KB article 914387 http://support.microsoft.com/kb/914387
For Unix systems just update /usr/share/zoneinfo/US/*