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Time Offsets DST Details Map Alabama: UTC−06:00 CT: Yes: Central Standard Time (Phenix City observes Eastern time on a de facto basis) Alaska: UTC−09:00 AKT Yes Most of state: UTC−09:00 AKST Alaska Standard Time: UTC−10:00 HT Aleutian Islands (west of 169°30' W): UTC−10:00 HST Hawaii–Aleutian Standard Time American Samoa: UTC−11: ...
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 time at the 135th meridian west of the Greenwich Observatory .
Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals. Four standard time zones for the continental United States were introduced at noon on November 18, 1883, in Chicago, Illinois, when the telegraph lines transmitted time signals to all major cities. [4] [5]
For example, Sitka, the capital of Alaska at the time, at longitude 135°20′W, had a local time equivalent to UTC+14:59 under Russia and UTC−09:01 under the United States. [ 7 ] In 1900, "Alaska Standard Time" was established within the state as UTC−09:00 .
This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round.
Time zones of the world. 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 strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
They were introduced in different years based on local decisions. Michigan adopted Central Standard Time throughout the state effective September 18, 1885. [1] [2] [3] In 1915, Detroit changed to Eastern time to be on the same time zone as New York, [4] followed by most of the rest of the state in 1931. [5]
The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time (UTC−07:00) is in effect, and by subtracting six hours during daylight saving time (UTC−06:00). The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich ...