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. At the end of Daylight Saving Time turn your clocks back 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.
In the United States, Under the Uniform Time Act, the Department of Transportation is in charge of time zones in the United States and ensuring that jurisdictions observing Daylight Saving Time begin and end on the same date.
On Monday August 8, 2005 President Bush signed into law a broad energy bill that extended Daylight Saving Time by four weeks beginning in 2007. Since 1986 the United States had observed Daylight Saving Time from the first Sunday in April through the last Sunday in October. The provisions of the bill call for Daylight Saving Time to begin three weeks earlier on the second Sunday in March and end on the first Sunday in November. Read our special section about the extension of Daylight Saving Time.