Daylight Saving Time Begins

Updated 5:30 a.m., March 13, 2011.

Have you set your clocks ahead an hour? If not, so do.

Daylight Saving Time officially began at 2 a.m. Sunday, March 13.

Daylight Saving Time is also a good time to change the batteries in your smoke detectors and carbon monoxide alarms, according to the United States Fire Administration.

Until 2005, Daylight Saving Time began on the first Sunday in April and ended on the last Sunday in October. With the passage of the Energy Policy Act of 2005, the period was extended by a total of four weeks.  The start date was moved to the second Sunday in March and the end date was shifted to the first Sunday in November.