To conserve energy, in the United States daylight-saving time started three weeks earlier and will end one week later this year (November 4, instead of October 28). These type of changes in time zones rules are occurring around the world as well. Here are some resources to help you keep your systems up to date:
Daylight Saving Time Help and Support Center
Microsoft Daylight Saving Time & Time Zone FAQs Blog
I've included a link for the mobile users out there.
Did you see this post at blogs.msdn.com