During World War II, Congress enacted the War Time Act on January 20, 1942. Year-round DST 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.

Click in picture to continue.     View image