In the United States, people turn their clocks ahead one hour at the start of Daylight Saving Time. This takes place at 2:00 a.m. local time on the second Sunday of March, as of 2015.
The Energy Policy Act of 2005 proposed a new Daylight Saving Time schedule that came into effect in 2007. Under the new schedule, DST ends on the first Sunday in November. It is approximately a month longer than the previous schedule. All states, with the exception of Hawaii and Arizona, observe DST.
The industrialist Robert Garland proposed DST, and President Woodrow Wilson instituted it in 1918 during World War I as a way to conserve energy by optimizing daylight hours. Over 70 countries around the world use varying forms of DST.