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Daylight saving time was first used during World War I, as part of an
effort in the United States and other warring countries to conserve fuel.
In theory, using daylight more efficiently saves fuel and energy
because it reduces the nation's need for artificial light.
The first American to advocate for daylight saving was
Benjamin Franklin. He realized in 1784 that many people
burned candles at night yet slept past dawn in the summer,
wasting early-morning sunlight.
Two states--Arizona and Hawaii--and three U.S. territories--American
Samoa, Puerto Rico, and the U.S. Virgin Islands--don't observe daylight
saving time. Indiana adopted DST in 2006.
A U.S. law signed by President George W. Bush in 2005
extended the length of daylight saving time by four weeks. It
now begins at 2 a.m. on the second Sunday in March. It ends
on the first Sunday in November.
daylight saving time
George W. Bush
Benjamin Franklin
1942 - President Franklin D. Roosevelt instituted "war-time,"
a year-round daylight-saving time to save energy during
World War II. After the year-round shift ended in 1945, many
states adopted their own summer time changes.
Franklin D. Roosevelt
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