Microsoft Knowledge Base Article 914387 contains the following INTRODUCTION:
Because of the Energy Policy Act, daylight saving time is extended by four weeks in 2007. This change starts on the second Sunday of March and ends on the first Sunday of November.
The 2006 implementation is as follows:
• Daylight saving time starts at 02:00 A.M. on April 2, 2006.
• Daylight saving time ends at 02:00 A.M. on October 29, 2006.
The 2007 implementation is as follows:
• Daylight saving time starts at 02:00 A.M. on March 11, 2007.
• Daylight saving time ends at 02:00 A.M. on November 4, 2007.
In the United States, clocks change at 02:00 A.M. local time. On March 11, 2007, clocks will spring forward from 01:59 A.M. to 03:00 A.M. On November 4, 2007, clocks will fall back from 01:59 A.M. to 01:00 A.M. For more information about the 2007 daylight saving time start and end dates in the United States, visit the following Web site: