Daylight saving time explained

Published On: Nov 04 2011 09:22:25 AM PDT   Updated On: Oct 30 2015 07:59:43 AM PDT

Daylight saving time begins this weekend. What's behind the tradition of pushing our clocks ahead each spring and setting them back each autumn?

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Kacper M/

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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