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?

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The changes went into effect in 2007 and were meant to save electricity, although a U.S. Department of Energy study estimated a savings of less than 1 percent of the country's annual energy consumption.

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