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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Toni Mihailov/

Contrary to popular belief, no federal rule mandates that states or territories observe daylight saving time.


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