http://wwp.daylight-saving-time.comQuote »USA - United States of America until 2006Daylight 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.Daylight Saving Time, for the U.S. and its territories, is NOT observed in Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands, the Eastern Time Zone portion of the State of Indiana, and the state of Arizona (not the Navajo Indian Reservation, which does observe). Navajo Nation participates in the Daylight Saving Time policy, due to its large size and location in three statesRule * Start: First Sunday in April * End: Last Sunday in October Quote »USA - United States of America from 2007FROM 2007: Daylight Saving Time begins for most of the United States at 2 a.m. on the second Sunday of March. Time will revert to standard time at 2 a.m. on the first Sunday in November.Daylight Saving Time, for the U.S. and its territories, is NOT observed in Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands, the Eastern Time Zone portion of the State of Indiana, and the state of Arizona (not the Navajo Indian Reservation, which does observe). Navajo Nation participates in the Daylight Saving Time policy, due to its large size and location in three statesDaylight Saving Time Schedule USA 2007 - 2015As prescribed: The Energy Policy Act of 2005Rule * Start: Second Sunday in March * End: First Sunday in November