Daylight saving time in the United States - Wikipedia
https://en.wikipedia.org/wiki/Daylight_saving_time_in_the_United_States
During World War I, in an effort to conserve fuel, Germany began observing DST on May 1, 1916. The rest of Europe soon followed. The plan was not adopted in the United States until the Standard Time Act of March 19, 1918, which confirmed the existing standard time zone system and set summer DST to begin on March 31, 1918 (reverting October 27). The idea was …
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