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  2. Greenwich Mean Time - Wikipedia

    en.wikipedia.org/wiki/Greenwich_Mean_Time

    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.

  3. Eastern Time Zone - Wikipedia

    en.wikipedia.org/wiki/Eastern_Time_Zone

    Current time. 08:15, 24 May 2024 EST [ refresh] 09:15, 24 May 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 .

  4. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation, but no ...

  5. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    Each time zone is defined by a standard offset from Coordinated Universal Time (UTC). The offsets range from UTC−12:00 to UTC+14:00, and are usually a whole number of hours, but a few zones are offset by an additional 30 or 45 minutes, such as in India and Nepal.

  6. List of time zones by country - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zones_by_country

    UTC−05:00 – Eastern Time zone: roughly a triangle covering all the states from the Great Lakes down to Florida and east to the Atlantic coast UTC−04:00 – Puerto Rico, the U.S. Virgin Islands UTC+10:00 – Guam and the Northern Mariana Islands UTC+12:00 (WAKT) – Wake Island: Time in the United States: Antarctica: 10

  7. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The American Heritage Dictionary of the English Language states "By convention, 12 AM denotes midnight and 12 PM denotes noon. Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight." E. G. Richards in his book Mapping Time (1999) provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight.

  8. Standard time - Wikipedia

    en.wikipedia.org/wiki/Standard_time

    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. The shift to the current Central European Time zone took place on 16 May 1940. The German occupiers ordered the clock to be moved an hour and forty minutes ...

  9. Time in Canada - Wikipedia

    en.wikipedia.org/wiki/Time_in_Canada

    Central Standard Time (CST) GMT−06:00 year-round: Saskatchewan (most of the province) (see Lloydminster, and Creighton, above) Eastern Time Zone. Eastern Standard Time (EST) GMT−05:00 and Eastern Daylight Time (EDT) GMT−04:00: Nunavut east of 85° West, and; all communities in the Qikiqtaaluk Region except Resolute; Ontario