Remember to set your clocks ahead one hour tonight because Daylight Saving Time officially starts at 2 a.m. on Sunday. It ends the first Sunday in November.
Benjamin Franklin first thought up the idea of daylight saving in 1784. It wasn't instituted until World War I, when it went into effect to save energy used for lights.
The Standard Time Act established time zones and daylight saving in 1918, but it was short-lived. Daylight saving was repealed the following year.
The Uniform Time Act of 1966 established Daylight Saving Time throughout the United States and gave states the option to exempt themselves. Hawaii and most of Arizona do not follow Daylight Saving Time. Guam, Puerto Rico, the Virgin Islands and American Samoa also skip out on the clock-changing fun.
Credit: http://www.cnn.com/2013/03/09/us/daylight-saving-time/