(DST), time observed when clocks and other timepieces are set ahead so that the sun will rise and set later in the day as measured by civil time. The amount of daylight on a given day of the year at a given latitude is fixed, but over the year the hours of sunrise and sunset vary from day to day. During the summer months, the sun rises earlier and sets later and there are more hours of daylight. If clocks and other timepieces are set ahead in the spring by some amount (usually one hour), the sun will rise and set later in the day as measured by those clocks. This provides more usable hours of daylight for activities that occur in the afternoon and evening, such as outdoor recreation. Daylight saving time can also be a means of conserving electrical and other forms of energy. In the fall, as the period of daylight grows shorter, clocks are set back to correspond to standard time.
Benjamin Franklin, when serving as U.S. minister to France, wrote an article recommending earlier opening and closing of shops to save the cost of lighting. In England, William Willett in 1907 began to urge the adoption of daylight saving time. During World War I the plan was adopted in England, Germany, France, and many other countries. In the United States, Robert Garland of Pittsburgh was a leading influence in securing the introduction and passage of a law (signed by President Wilson on Mar. 31, 1918) establishing daylight saving time in the United States. After World War I the law was repealed (1919). In World War II, however, national daylight saving time was reestablished by law on a year-round basis. National year-round daylight saving time was adopted as a fuel-saving measure during the energy crisis of the winter of 1973–74. In late 1974, standard time was reinstituted for the winter period. In 1987 federal legislation fixed the period of daylight saving time in the United States as the first Sunday (previously the last Sunday) in April to the last Sunday in October; it was expanded in 2005 (effective 2007) to extend from the second Sunday in March to the first Sunday in November. Arizona and Hawaii do not use daylight saving time.
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Wednesday, Oct. 31, 2018 Daylight Saving Time (DST) began at 2am on Sunday, Mar. 11, 2018 with "spring forward" when most of the United States moved clocks forward by one hour, and ends at 2am on Sunday, Nov. 4, 2018 when those clocks will "fall back" one hour. DST was implemented in the United…continue
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In my research on daylight saving time, I have found that Americans don’t like it when Congress messes with their clocks. In an effort to avoid the biannual clock switch in spring and fall, some well-intended critics of DST have made the mistake of suggesting that the abolition of DST – and a return…continue
William Willett, a Chelsea builder, incurred ridicule when, in 1907, be proposed putting the clocks an hour forward in summer, but the idea...
The idea of making fuller use of the hours of daylight by advancing the clock originated with Benjamin Franklin (1706-90), but its...
(a) (period when something takes place) tiempo m computer time = tiempo de utilización de un ordenador (pagado a...