Daylight Saving Time in the United States In the United States Daylight Saving Time begins at 2:00 a.m. local time on the second Sunday in March. On the first Sunday in November areas on Daylight Saving Time return to Standard Time at 2:00 a.m. During Daylight Saving Time turn your clocks ahead one hour. The names in each time zone change along with Daylight Saving Time. Eastern Standard Time (EST) becomes Eastern Daylight Time (EDT), and so forth. Arizona, Puerto Rico, Hawaii, U.S. Virgin Islands and American Samoa do not observe Daylight Saving Time. Here is a reminder: 2008-- from March 9 to November 2 2009-- from March 8 to November 1 2010-- from March 14 to November 7