During World War II, Congress enacted the War Time Act on
January 20, 1942. Year-round
was reinstated in the United States on
February 9, 1942, again as a wartime measure to conserve energy resources.
This remained in effect until after the end of the war. The Amendment to the
War Time Act , enacted September 25, 1945, ended DST as of
September 30, 1945. During this period, the official designation War Time was
used for year-round DST. For example, Eastern War Time (EWT) would be the
equivalent of Eastern Daylight Time during this period.
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