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Standard Time Act

A glowing clock at night displays the time as 10:05, with a softly lit background featuring blurred lights and a distant building silhouette.

Passed by the U.S. Congress on March 19, 1918, also known as the Calder Act. It gave federal legal force to the four time zones the railroads had imposed thirty-five years earlier and introduced the country's first nationwide daylight saving period. The Interstate Commerce Commission was assigned the job of drawing zone boundaries, a railroad regulator overseeing the legal definition of time.

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