Daylight saving time explained

POSTED: 09:22 AM PDT Nov 04, 2011    UPDATED: 07:59 AM PDT Oct 30, 2015 

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

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