Daylight Saving Time (DST) begins Sunday, March 10, 2013, at 2 a.m. when residents of the United States and seventy-four other countries set their clocks ahead one hour.
Benjamin Franklin suggested the idea in 1784, but it wasn’t utilized until World War I when Britain and Germany began the practice to save energy. The United States observed DST at various times throughout and after World War II, but did not make it official until The Uniform Time Act of 1966. The dates have changed over the years. The Energy Policy Act of 2005 extended Daylight Saving Time by one month; the current schedule was implemented in 2007.
Studies have shown that the increased daylight prevents traffic fatalities and saves energy, but controversy rages on.
States can opt out – Arizona, Hawaii and several US territories do not observe Daylight Saving Time. This year, it ends on Sunday, November 4, 2012.