Daylight saving time explained

Posted: 12:22 PM EDT Nov 04, 2011   Updated: 4:42 PM EST Mar 10, 2016

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/FreeImages.com

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

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