Daylight saving time
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Daylight saving time, also referred to as daylight savings time, daylight time, or summer time, is the practice of advancing clocks to make better use of the longer daylight available during summer by
An ancient water clock that lets hour lengths vary with season
George Hudson was the first to propose modern DST, in 1895.
DST was first implemented in the United States to conserve energy during World War I (poster by United Cigar Stores).
Retailers generally favor DST; United Cigar Stores hailed a 1918 DST bill.
Time in the United States
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In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time for approximately
Standard time in the contiguous United States, illustration 1903
Marker showing the border of Wayne County, Kentucky, and the Eastern Time Zone, coming from Clinton County, same state, Central Time Zone