Daylight saving time explained

Published On: Nov 04 2011 09:22:25 AM PDT   Updated On: Oct 31 2014 07:19:18 AM PDT

Daylight saving time ends this weekend. What's behind the tradition of turning our clocks back each fall?

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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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