Daylight Saving Time (DST) officially begins on Sunday, March 14, at 2:00 a.m. So don't forget to set your clocks ahead one hour when you go to bed Saturday night.
DST was instituted during WWI to save energy for war production. After WWII states chose whether to observe DST, but the Uniform Time Act was passed in 1966 in order to standardize time in the United States.
In 2007 DST was extended by four weeks in an attempt to save even more energy.