When does Daylight Saving Time begin and end?

Per the Energy Policy Act of 2005, Daylight Saving Time was extended to begin the second Sunday in March and end the first Sunday of November. This change went into effect in 2007.

2013, Begins 10 March, Ends 3 November
2014, Begins 9 March, Ends 2 November
2015, Begins 8 March, End 1 November

History of daylight savings time provided by U.S. Naval Observatory .

Source: Chase's Calendar of Events, 2013, pp. 614-616.