Daylight saving time explained

Published On: Nov 04 2011 11:22:25 AM CDT   Updated On: Oct 30 2015 09:59:43 AM CDT

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 4
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Odd Geir Malterud/

But people in Hawaii and most of Arizona-- along with Puerto Rico, American Samoa and the Virgin Islands -- will do nothing come Saturday. Those locales never deviate from standard time.

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