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| | Daylight saving time - Wikipedia, the free encyclopedia |
 | | Daylight saving time (DST), also known as summer time, is a widely used system of adjusting the official local time forward, usually by one hour from its official standard time, for the spring, summer, and early autumn periods. |
 | | On March 19, 1918, the U.S. Congress established several time zones, which had been in use by railroads and most cities since 1883 and made DST official, effective March 31, for the remainder of World War I. It was observed for seven months in 1918 and 1919. |
 | | Another issue is that the Alaskan mainland's single time zone is too wide and there is a large disparity between civil time and solar time with solar noon occurring as late as 3:00 P.M. by the clock in a place like Nome,_Alaska. |
| en.wikipedia.org /wiki/Daylight_saving_time (7581 words) |
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