In 2005 and 2006, Daylight Saving Time begins for most of the United States at 2 a.m. on the first Sunday of April. Time reverts to standard time at 2 a.m. on the last Sunday of October.
Beginning in 2007, Daylight Saving Time is extended one month and begins for most of the United States at:
2 a.m. on the Second Sunday in March
to
2 a.m. on the First Sunday of November.