Beginning in 2007, daylight saving time (DST) will be extended in the United States. DST will start on March 11, 2007, which is three weeks earlier than usual, and it will end on November 4, 2007, which is one week later than usual. This results in a new DST period that is four weeks longer than in previous years.
Is your PC ready? (Microsoft Support Center)
Is your PC ready? (Microsoft Support Center)