Daylight saving time explained

POSTED: 12:22 PM Nov 04 2011   UPDATED: 4:42 PM 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?

DST - Clock 1
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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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