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Coordinated Universal Time
COORDINATED UNIVERSAL TIME (French : _Temps universel coordonné_), abbreviated to UTC, is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude ; it does not observe daylight saving time . For most purposes, UTC is considered interchangeable with Greenwich Mean Time (GMT), but GMT is no longer precisely defined by the scientific community. The first Coordinated Universal Time was informally adopted on 1 January 1960. The system was adjusted several times, including a brief period where time coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" until a new UTC was adopted in 1970 and implemented in 1972. This change also adopted leap seconds to simplify future adjustments. This CCIR Recommendation 460 "stated that (a) carrier frequencies and time intervals should be maintained constant and should correspond to the definition of the SI second; (b) step adjustments, when necessary, should be exactly 1 s to maintain approximate agreement with Universal Time (UT); and (c) standard signals should contain information on the difference between UTC and UT." A number of proposals have been made to replace UTC with a new system that would eliminate leap seconds, and the decision to remove them altogether has been tabled until 2023
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UTC−12
UTC−12:00 is a time offset that subtracts 12 hours from Coordinated Universal Time (UTC). Therefore, it is the last to celebrate a New Year . CONTENTS* 1 As standard time (all year round) * 1.1 Oceania * 2 Characteristics of the time zone which observes UTC-12 * 3 See also * 4 References AS STANDARD TIME (ALL YEAR ROUND)OCEANIA* United States
United States
* Baker Island and Howland Island (uninhabited islands belonging to the United States) UTC−12
UTC−12
is a nautical time zone comprising the high seas between 180° and 172°30′W longitude, and the time is obtained by subtracting twelve hours from Coordinated Universal Time . Ships using this time are the last to begin each calendar day. CHARACTERISTICS OF THE TIME ZONE WHICH OBSERVES UTC-12A number of inhabited islands lie within the longitudinal limits of this time zone, but none of them keeps the date and time of UTC-12. Instead, they keep the time and date (or just the date) of one of the neighbouring zones, usually because they belong, politically, to an island group whose other members lie mostly in the neighbouring time zone. Since the International Date Line West (IDLW) time-zone represents the last place on Earth
Earth
where any date exists, it is sometimes used for deadlines and referred to as Anywhere on Earth
Earth
(AoE)
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UTC−10
UTC−10:00 is a time offset that subtracts 10 hours from Coordinated Universal Time (UTC). This time is used in: Hawaii , Alaska , French Polynesia and Cook islands (CKT ) CONTENTS* 1 As standard time (Northern Hemisphere winter) * 1.1 North America * 2 As standard time (all year round) * 2.1 Oceania * 3 Historical changes * 4 Historical changes (Southern Hemisphere summer) * 5 References AS STANDARD TIME (NORTHERN HEMISPHERE WINTER)NORTH AMERICA* United States - Hawaii–Aleutian Time Zone * Aleutian Islands (Alaska west of 169° 30′ West)AS STANDARD TIME (ALL YEAR ROUND)OCEANIA* United States - Hawaii–Aleutian Time Zone * Hawaii * Johnston Atoll * New Zealand * Cook Islands * French Polynesia * Society Islands including Tahiti * Tuamotu Archipelago * Austral and Bass Islands HISTORICAL CHANGES* Kiribati * Line Islands - including Kiritimati (Christmas Island) * The IANA time zone database zone identifier is Pacific/Kiritimati
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UTC−09
UTC−09:00 is a time offset that subtracts 9 hours from Coordinated Universal Time (UTC). This time is used in: CONTENTS* 1 As standard time (Northern Hemisphere winter) * 1.1 North America * 2 As daylight saving time (Northern Hemisphere summer) * 2.1 North America * 3 As standard time (all year round) * 3.1 Oceania AS STANDARD TIME (NORTHERN HEMISPHERE WINTER)NORTH AMERICA* United States - Alaska Time Zone * Alaska (except for the Aleutian Islands lying west of −169.5° (169°30' W) longitude) * Samalga Island , at longitude 169°12′W, is the westernmost area of Alaska that observes UTC−9, but is far west of the theoretical zone limits (−142.5° to -127.5° longitude)
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UTC−08
UTC−08:00 is an identifier for a time offset from UTC of −08. This time is used in: CONTENTS* 1 As standard time (Northern Hemisphere winter) * 1.1 North America * 2 As daylight saving time (Northern Hemisphere summer) * 2.1 North America * 3 As standard time (all year round) * 3.1 North America * 3.2 Oceania AS STANDARD TIME (NORTHERN HEMISPHERE WINTER)NORTH AMERICA* Canada - Pacific Time Zone * British Columbia (most of province) * Yukon * United States - Pacific Time Zone * California * Idaho (northern section) * Nevada (most of state) * Oregon (most of state) * Washington * Mexico - Northwest Zone * Baja California AS DAYLIGHT SAVING TIME (NORTHERN HEMISPHERE SUMMER)NORTH AMERICA* United States - Alaska Time Zone * Alaska (except for Aleutian Islands)AS STANDARD TIME (ALL YEAR ROUND)NORTH AMERICA* Canada - Pacific Time Zone * Northwest Territories * Tungsten and the associated Cantung Mine * Mexico * Clarion Island , westernmost island of Revillagigedo Islands * France * Clipperton Island OCEANIA* United Kingdom * Pitcairn Islands * v * t * e Coordinated Universal Time (UTC) UTC offset for standard time and Daylight saving time (DST) Italics: historical or unofficial 180° TO < 90°W
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UTC−07
UTC−07:00 is a time offset that subtracts 7 hours from Coordinated Universal Time (UTC). In North America, it is observed in the Mountain Time Zone during standard time , and in the Pacific Time Zone during the other 8 months (see Daylight saving time ). A few places use it year-round
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UTC−06
UTC−06:00 is a time offset that subtracts six hours from Coordinated Universal Time (UTC). In North America, it is observed in the Central Time Zone during standard time , and in the Mountain Time Zone during the other eight months (see Daylight saving time ). Several Latin American countries and a few other places use it year round. CONTENTS* 1 As standard time (Northern Hemisphere winter) * 1.1 North America * 2 As daylight saving time (Northern Hemisphere summer) * 2.1 North America * 3 As standard time (all year round) * 3.1 North America * 3.2 Central America * 3.3 East Pacific * 4 As standard time (Southern Hemisphere winter) * 4.1 East Pacific * 5 See also * 5.1 References AS STANDARD TIME (NORTHERN HEMISPHERE WINTER)NORTH AMERICACST is standard time in the 6th time zone west of Greenwich, reckoned at the 90th meridian; used in North America in some parts of Canada, Mexico and the United States
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UTC−05
UTC−05:00 is a time offset that subtracts five hours from Coordinated Universal Time (UTC). In North America, it is observed in the Eastern Time Zone during standard time , and in the Central Time Zone during the other eight months (see Daylight saving time ). The western Caribbean uses it year round. CONTENTS* 1 As standard time (Northern Hemisphere winter) * 1.1 North America * 1.2 Caribbean * 2 As daylight saving time (Northern Hemisphere summer) * 2.1 North America * 3 Standard time all year round * 3.1 North America * 3.2 Caribbean * 3.3 Central and South America * 4 As daylight saving time (Southern Hemisphere summer) * 4.1 East Pacific * 5 See also * 6 References AS STANDARD TIME (NORTHERN HEMISPHERE WINTER)NORTH AMERICA* Canada – Eastern Time Zone * Nunavut (eastern), most of Ontario and most of Quebec * United States – Eastern Time Zone * All of Connecticut , Delaware , District of Columbia , Georgia , Maine , Maryland , Massachusetts , New Hampshire , New Jersey , New York , North Carolina , Ohio , Pennsylvania , Rhode Island , South Carolina , Vermont , Virginia , and West Virginia * Most of Florida , Indiana , and Michigan * Eastern parts of Kentucky and Tennessee * Unofficial use in several communities in Russell County, Alabama , including Phenix City
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UTC−04
UTC−04:00 is a time offset that subtracts 4 hours from Coordinated Universal Time (UTC). It is observed in the Eastern Time Zone (e.g., Canada and the United States ) during the warm months of daylight saving time , as Eastern Daylight Time . The Atlantic Time Zone observes it during standard time (cold months). It is observed all year in the Eastern Caribbean
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UTC−01
UTC−01:00 is an identifier for a time offset from UTC of −01. This time is used in: CONTENTS* 1 As standard time (Northern Hemisphere winter) * 1.1 North America * 1.2 Atlantic Ocean * 2 As standard time (all year round) * 2.1 Atlantic Ocean AS STANDARD TIME (NORTHERN HEMISPHERE WINTER)NORTH AMERICA* Greenland * Eastern Greenland (Ittoqqortoormiit and surrounding area – observes European Union DST rules)ATLANTIC OCEAN* Portugal * Azores since 1966, except in 1992–1993 winter (WET /UTC+00:00 used instead)AS STANDARD TIME (ALL YEAR ROUND)ATLANTIC OCEAN * Cape Verde * v * t * e Coordinated Universal Time (UTC) UTC offset for standard time and Daylight saving time (DST) Italics: historical or unofficial 180° TO < 90°W * −12:00 * −11:00 * −10:30 * −10:00 * −09:30 * −09:00 * −08:30 * −08:00 * −07:00 90°W TO < 0° * −06:00 * −05:00 * −04:30 * −04:00 * −03:30 * −03:00 * −02:30 * −02:00 * −01:00 * −00:44 * −00:25:21 0° TO < 90°E * ±00:00 * +00:20 * +00:30 * +01:00 * +01:24 * +01:30 * +02:00 * +02:30 * +03:00 * +03:30 * +04:00 * +04:30 * +04:51 * +05:00 * +05:30 * +05:40 * +05:45 90°E TO < 180° * +06:00 * +06:30 * +07:00 * +07:20 * +07:30 * +0
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UTC+01
UTC+01:00 is a time offset that adds 1 hour to Coordinated Universal Time (UTC). This time is used in: * Central European Time * West Africa Time * Western European Summer Time * British Summer Time * Irish Standard Time * Romance Standard Time (Microsoft Windows Control panel) * Swatch Internet Time * EVE Online In ISO 8601 the associated time would be written as 2017-08-08T12:06:10+01:00
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