Daylight saving time begins this weekend. What's behind the tradition of pushing our clocks ahead each spring and setting them back each autumn?
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.
Bill Ingalls/NASA via Getty Images
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Rabbani and Solimene Photography, Chris Jackson/Getty Images
U.S. National Archives
Dutch National Archives
Neilson Barnard/Getty Images for TIME Inc.
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National Archives and Records Administration
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