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Today in History—March 31: How WWI Invented Daylight Saving Time
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March 31, 1918: How WWI invented Daylight Saving Time
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March 31, 1918: How WWI invented Daylight Saving Time
Prints and Photographs Division/Library of Congress Washington, D.C. (LC-USZC4-8124); Photo Illustration Encyclopædia Britannica, Inc.