Daylight saving time explained

POSTED: 09:22 AM PDT Nov 04, 2011    UPDATED: 11:00 PM PST Mar 06, 2014 

What's behind the tradition of turning our clocks ahead each spring?

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The idea of daylight saving time was introduced nationwide in 1918, when Congress formally approved the time zones the U.S. railroad industry had been following since 1883, according to National Geographic.

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