Time zone
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A time zone is an area which observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of s
World time clock, 2.5 m high. Made in Dresden 1690. Technical Instrument Museum, Dresden
Plaque commemorating the Railway General Time Convention of 1883 in North America
The control panel of the Time Zone Clock in front of Coventry Transport Museum
Marine sandglass MMM
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.