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.
Standard time
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Standard time is the synchronisation of clocks within a geographical region to a single time standard, rather than a local mean time standard. The term is also used to contrast with daylight saving ti
Daylight saving time
…longer daylight available during summer by having darkness fall at a later clock time. The typical implementation of DST is to adjust clocks ahead of standard time by one hour in spring or late winter, and to set clocks back by one hour in the autumn (or fall in North American English, hence the mnemonic: "spring…
Telegraphic equipment used to transmit standard time from the Allegheny Observatory
A clock that was adjusted to Eastern Standard Time. It was made in the mid-1890s.