List: Time zones

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•  Greenwich Mean Time

  Greenwich Mean Time (GMT) is a term originally referring to mean solar time at the Royal Observatory in Greenwich, London. It is commonly used in practice to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, especially by bodies connected with the United Kingdom, such as the BBC World Service, the Royal Navy, the Met Office and others, although strictly UTC is an atomic time scale which only approximates GMT with a tolerance of 0.9 second.

  

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•  Time zone

  A time zone is a region of the earth that has uniform standard time, usually referred to as the local time. By convention, time zones compute their local time as an offset from UTC. Local time is UTC plus the current time zone offset for the considered location.

  

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•  Prime Meridian

  The Prime Meridian is the meridian at which the longitude is defined to be 0°. The Prime Meridian and its opposite the 180th meridian (at 180° longitude), which the International Date Line generally follows, form a great circle that divides the Earth into the Eastern and Western Hemispheres.

  

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•  Western European Summer Time

  Western European Summer Time (WEST) is a summer daylight saving time scheme, 1 hour ahead of Coordinated Universal Time. It is used in the following places: the Canary Islands the Faroe Islands Ireland the Crown dependencies the Madeira islands Continental Portugal the United Kingdom Western European Summer Time is also known by other names: British Summer Time (BST) in the United Kingdom. Irish Standard Time (IST) (Am Caighdeánach na hÉireann) in Ireland.

  

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•  Japan Standard Time

  Japan Standard Time or JST is the standard timezone of Japan, and is 9 hours ahead of UTC. For example, when it is midnight in UTC, it is 9 am in Japan Standard Time. There is no daylight saving time, though its introduction has been debated several times. Japan Standard Time is the same as Korea Standard Time, Eastern Indonesia Standard Time and Yakutsk Time. During World War II, it was often called Tokyo Standard Time in Western contexts.

  

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•  Korea Standard Time

  Korea Standard Time is the standard time zone in North and South Korea and is 9 hours ahead of UTC: i.e. , when it is midnight UTC, it is 9 am Korea Standard Time. Korea does not currently observe daylight saving time but has experimented with it in the past. Korea Standard Time is the same as Japan Standard Time, Indonesian Eastern Standard Time and Yakutsk Time.

  

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•  Durand Line

  The Durand Line refers to the border between Afghanistan and Pakistan, which is poorly marked and approximately 2,640 kilometers (1,610 miles) long. It was established after the 1893 Durand Line Agreement between the Government of colonial British India and Afghan Amir Abdur Rahman Khan for fixing the limit of their respective spheres of influence. It is named after Henry Mortimer Durand, the Foreign Secretary of British India at the time.

  

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•  International Date Line

  The International Date Line (IDL) is an imaginary line on the surface of the Earth opposite the Prime Meridian where the date changes as one travels east or west across it. Roughly along 180° longitude, with diversions to pass around some territories and island groups, it mostly corresponds to the time zone boundary separating −12 and +12 hours Coordinated Universal Time (UTC).

  

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•  Central Time Zone (Americas)

  The Central Time Zone is in the Americas and observes standard time by subtracting six hours from UTC during standard time (UTC–6) and five hours during daylight saving time (UTC–5). The clock time in this zone, composed almost totally of a strip of territory in North America, is based on the mean solar time of the 90th meridian west of the Greenwich Observatory. In the United States and Canada, this time zone is generically called Central Time (CT).

  

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•  Eastern Time Zone

  The Eastern Time Zone (ET) of the Western Hemisphere – also known as North American Eastern Standard Time (NAEST) – is a time zone that falls mostly along the east coast of North America and the west coast of South America. Its UTC time offset is −5 hrs during standard time and -4 hrs during daylight saving time. The clock time in this zone is based on the mean solar time of the 75th meridian west of the Greenwich Observatory.

  

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•  Mountain Time Zone

  The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time, sometimes called Greenwich Mean Time during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time in the spring, summer, and early autumn. The clock time in this zone is based on the mean solar time of the 105th meridian west of the Greenwich Observatory. In the United States and Canada, this time zone is generically called Mountain Time (MT).

  

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•  Indian Standard Time

  Indian Standard Time (IST) is the time observed throughout India and Sri Lanka, with a time offset of . India does not observe daylight saving time (DST) or other seasonal adjustments, although DST was used briefly during the Sino–Indian War of 1962 and the Indo–Pakistani Wars of 1965 and 1971. In military and aviation time, IST is designated E* ("Echo-Star").

  

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•  Pacific Time Zone

  The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time. The clock time in this zone is based on the mean solar time of the 120th meridian west of the Greenwich Observatory. During daylight saving time, its time offset is UTC-7. In the United States and Canada, this time zone is generically called Pacific Time (PT).

  

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•  Alaska Time Zone

  The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time. During daylight saving time its time offset is only eight hours. The clock time in this zone is based on the mean solar time of the 135th meridian west of the Greenwich Observatory. The zone includes nearly all of the U.S. state of Alaska and is one hour behind the Pacific Time Zone.

  

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•  Hawaii-Aleutian time zone

  

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•  Central European Time

  Central European Time (CET), used in most European and some North African countries, is one of the names of the time zone that is 1 hour ahead of Coordinated Universal Time (UTC), with a time offset of UTC+1 (in winter). Most countries have adopted the use of Central European Summer Time (CEST) daylight saving time in summer, with UTC+2.

  

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•  Western European Time

  O Horário da Europa Ocidental (WET, UTC+0, e mais conhecido como GMT é usado em Portugal continental e na Região Autónoma da Madeira, e é uma zona horária que cobre partes da Europa Ocidental e Norte-Ocidental, incluindo as seguintes regiões e países: Ilhas Canárias, desde 1946 Ilhas Faroé, desde 1908 Gronelândia Norte-Oriental Islândia, desde 1968 Portugal, desde 1911 com interrupções República da Irlanda, desde 1916 com interrupções Reino Unido, desde 1847 na Inglaterra, Escócia e País de Gales, desde 1916 na Irlanda do Norte, com interrupções Durante o Inverno, os países acima usam o WET, que corresponde ao Tempo Universal; contudo no Verão, a maioria, mas não todos os países acima referidos usam uma hora acima do Horário de...

  

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•  List of time zones

  

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•  UTC-5

  

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•  Standard time

  Standard time is the result of synchronizing clocks in different geographical locations within a time zone to the same time rather than using the local meridian as in local mean time or solar time. The time so set has come to be defined in terms of offsets from Universal Time. (See more about standard time. ) Where daylight saving time is used, "standard time" may refer to the time without daylight saving time.

  

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•  List of U.S. states by time zone

  This is a list of United States of America States by time zone. For more about the time zones of the U.S. see time in the United States. Most states are entirely contained within one time zone. However, some states are in two time zones, due to geographical, socio-political or economical reasons.

  

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•  Continental time

  In the United Kingdom, continental time refers to a time-keeping system used on the mainland of Europe, either the 24-hour clock, or the Central European Time zone. The former usage has become rarer as the UK uses the 24-hour clock more.

  

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•  Eastern European Time

  Eastern European Time (EET) is one of the names of UTC+2 time zone, 2 hours ahead of Coordinated Universal Time. It is used in some European, North African, and Middle Eastern countries. Most of them also use Eastern European Summer Time as a summer daylight saving time.

  

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•  Central European Summer Time

  Central European Summer Time (CEST) is one of the names of UTC+2 time zone, 2 hours ahead of Coordinated Universal Time. It is used as a summer daylight saving time in most European and some North African countries. During the winter, Central European Time is used. Central European Summer Time used to be also known under other names, such as Middle European Summer Time (MEST), Central European Daylight Saving Time (CEDT) or 'Bravo time', after the 2nd letter of the phonetic alphabet.

  

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•  Atlantic Standard Time Zone

  The Atlantic Standard Time Zone (AST) is a geographical region that keeps time by subtracting four hours from either Coordinated Universal Time or Greenwich Mean Time, resulting in UTC-4 or GMT-4. The clock time in this zone is based on the mean solar time of the 60th meridian west of the Greenwich Observatory. In Canada, the provinces of New Brunswick and Nova Scotia reckon time specifically as an offset of 4 hours from Greenwich Mean time.

  

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