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Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon ; [ 1 ] as a consequence, it cannot be used to specify a particular time unless a context is given.
The 12-hour clock was used throughout the British empire. During the 15th and 16th centuries, the 12-hour analog dial and time system gradually became established as standard throughout Northern Europe for general public use. The 24-hour analog dial was reserved for more specialized applications, such as astronomical clocks and chronometers.
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.
Greenwich Mean Time (GMT) :: UTC : Archived 2013-05-08 at the Wayback Machine; MHonArc Resources: TIMEZONES [permanent dead link] AIX time zone table Archived 2018-07-11 at the Wayback Machine; Time Zone Abbreviations
Current time. 17:52, 10 September 2024 EST [refresh] 18:52, 10 September 2024 EDT [refresh] Observance of DST. DST is observed in parts of this time zone. The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico.
UTC−11:00 (ST) – American Samoa, Jarvis Island, Kingman Reef, Midway Atoll and Palmyra Atoll. UTC−10:00 (HT) – Hawaii, most of the Aleutian Islands, and Johnston Atoll. UTC−09:00 (AKT) – Most of the state of Alaska. UTC−08:00 (PT) – Pacific Time zone: the Pacific coast states, the Idaho Panhandle and most of Nevada and Oregon.
This time was indicated as GMT +0h 19m 32.13s until 17 March 1937, after which it was simplified to GMT+0h20m. This time zone was also known as the Loenen time or Gorinchem time, as this was the exact time in both Loenen and Gorinchem. At noon in Amsterdam, it was 11:40 in London and 12:40 in Berlin.
In traditional American usage, dates are written in the month–day–year order (e.g. September 17, 2024) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (11:47 am). International date and time formats typically follow the ISO 8601 format (2024-09-17) for all-numeric dates, [3 ...