The Yukon Time Zone was a

time zone A time zone is an area which observes a uniform standard time for legal, Commerce, commercial and social purposes. Time zones tend to follow the boundaries between Country, countries and their Administrative division, subdivisions instead of ...

that kept

standard time Standard time is the synchronisation of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at some meridian that passes through the r ...

; Yukon Standard Time (YST) was obtained by subtracting nine hours from

Coordinated Universal Time Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. It is within about one second of mean solar time (such as UT1) at 0° longitude (at the IERS Reference Meridian as the currently used ...

(UTC) resulting in UTC−09:00.UTC-based calculations began in 1972. Before that they were determined in reference to

Greenwich Mean Time Greenwich Mean Time (GMT) is the Local mean time, mean solar time at the Royal Observatory, Greenwich, Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, i ...

Yukon Daylight Time (YDT) when observed was eight hours behind UTC. In 1983 the UTC−09:00 based time zone was restructured and renamed the

Alaska Time Zone The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (UTC−09:00). During daylight saving time its time offset is eight hours (UTC−08:00). The clock time in this zone is based on mean solar ti ...

Extent and history

When it was created, the Yukon Time Zone included

Yukon Yukon (; ; formerly called Yukon Territory and also referred to as the Yukon) is the smallest and westernmost of Canada's three territories. It also is the second-least populated province or territory in Canada, with a population of 43,964 as ...

, and a small region around

Yakutat, Alaska The City and Borough of Yakutat (, ; Tlingit: ''Yaakwdáat''; russian: Якутат) is a borough in the U.S. state of Alaska and the name of a former city within it. The name in Tlingit is ''Yaakwdáat'' (meaning "the place where canoe ...

(Alaska had been spread across four different

s at the time). Yukon, which had adopted Yukon Standard Time in 1900, observed a one-hour advance in 1918 and 1919, and again year-round from February 1942 to September 1945 (Yukon War Time then, after V-J Day, Yukon Prevailing Time). In 1965, from the last Sunday in April to the last Sunday in September, double daylight time a two-hour advance was observed. On July 1, 1966, most of the Yukon switched to Pacific Standard Time (PST), which is UTC-08:00, leaving Dawson City and Old Crow on Yukon time. The remaining area changed to Pacific Time on October 28, 1973, leaving only Yakutat on the Yukon Time Zone. On October 30, 1983, coincident with the end of daylight saving time, Alaska switched in 1983 from four time zones to two time zones. The areas east of Yakutat set clocks back two hours to change from Pacific Daylight Time to what had been Yukon Standard Time, UTC-09:00, and the time zone was named Alaska Standard Time at the end of November. Yakutat only set clocks back one hour on that date. Most of the remaining longitudes of Alaska left their clocks unchanged on that date, changing from Alaska-Hawaii Daylight Time (UTC-09:00) to the new Alaska Standard Time (UTC-09:00). Some areas that had been on Bering Time ( UTC-11:00 in winter, UTC-10:00 in summer) such as Nome set their clocks ahead yet another hour on October 30, 1983 to adopt Alaska Standard Time (the former Yukon Standard Time), effectively changing their standard time zone by two hours. Most of the

Aleutian Islands The Aleutian Islands (; ; ale, Unangam Tanangin,”Land of the Aleuts", possibly from Chukchi language, Chukchi ''aliat'', "island"), also called the Aleut Islands or Aleutic Islands and known before 1867 as the Catherine Archipelago, are a cha ...

moved from the Bering Time Zone (UTC-11:00) to the Hawaii-Aleutian Standard Time Zone (UTC-10:00) (until 1983 known as the Alaska-Hawaii Standard Time Zone).

Notes

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Extent and history

Notes

See also