Daylight saving time explained

Published On: Nov 04 2011 09:22:25 AM PDT   Updated On: Mar 05 2015 10:06:33 AM PST

Daylight saving time begins this weekend. What's behind the tradition of pushing our clocks ahead each spring?

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Daylight saving time was observed nationally again during World War II, but not uniformly practiced until 1966, when start and end dates were standardized. States could still opt out if they wished.

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