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31/03/1918 US adopts daylight saving time

6:40

Daylight Saving Time Explained

2:20

Daylight Saving Time 101 | National Geographic

7:32

Who Really Invented Daylight Saving Time

During World War I, in an effort to conserve fuel, Germany began observing DST in May 1916. The rest of Europe soon followed. The plan was not adopted in the US until the Standard Time Act of March 1918, which confirmed the existing standard time zone system and set summer DST to begin on the last day of March 1918.
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    • Essentials 

    • History of DST in the United States 

    • Procedure for modifications 

    • Local DST observance