The United States introduced daylight saving time as a wartime measure in March 1918 and then again during World War II, but repealed it after the wars ended. Some states and cities liked the extra hour of sunlight’s effect on businesses and continued the practice. In 1966, the Uniform Time Act established a U.S. daylight saving time calendar, allowing states to opt out, and the Energy Policy Act of 2005 then extended DST by several weeks.
While energy conservation is touted as a reason for DST, research doesn’t appear to support it. In 2010, Yale University’s Matthew Kotchen and University of California-Santa Barbara’s Laura Grant concluded that increased heating and cooling costs associated with the time change more than offset electricity savings on lighting.
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