Time Zone Abbreviations
64 abbreviations · part of Units of Measurement Abbreviations
Abbreviations for time standards (UTC, GMT, TAI) and regional time zones, with their offsets from Coordinated Universal Time and their daylight saving rules. Many abbreviations are ambiguous, since CST, IST, BST, AST and PST each name more than one zone, so international schedules are clearest when they add a UTC offset (UTC-5) or an IANA zone name such as America/New_York. In the US and Canada, daylight saving time runs from the second Sunday in March to the first Sunday in November; in the EU and UK, from the last Sunday in March to the last Sunday in October.
| Abbreviation | Stands for | Description |
|---|---|---|
| ACDT | Australian Central Daylight Time | South Australia and Broken Hill switch to this UTC+10:30 daylight time from the first Sunday in October to the first Sunday in April. |
| ACST | Australian Central Standard Time | UTC+9:30, used in South Australia, the Northern Territory and the city of Broken Hill in New South Wales. |
| ADT | Atlantic Daylight Time | Summer time of Canada's Maritime provinces and Bermuda, three hours behind UTC, observed from the second Sunday in March to the first Sunday in November. |
| AEDT | Australian Eastern Daylight Time | Summer time of New South Wales, Victoria, Tasmania and the ACT, UTC+11, from the first Sunday in October to the first Sunday in April. |
| AEST | Australian Eastern Standard Time | UTC+10, the standard time of Queensland, New South Wales, Victoria, Tasmania and the Australian Capital Territory. |
| AKDT | Alaska Daylight Time | Summer time in most of Alaska, eight hours behind UTC, from the second Sunday in March to the first Sunday in November. |
| AKST | Alaska Standard Time | Alaska's winter time, nine hours behind UTC, used in Anchorage, Fairbanks, Juneau and most of the state. |
| AoE | Anywhere on Earth | A deadline convention, widely used for academic conference submissions, meaning a deadline is met as long as the stated date has not ended anywhere on the planet. |
| ART | Argentina Time | Argentina's single time zone, UTC−3, used all year in Buenos Aires and across the country. |
| AST | Arabia Standard Time | Three hours ahead of UTC all year, Arabia Standard Time covers Saudi Arabia, Kuwait, Qatar, Bahrain, Iraq and Yemen, none of which observes daylight saving. |
| AWST | Australian Western Standard Time | Western Australia's time, UTC+8, kept all year. |
| BRT | Brasilia Time | Official time of Brazil's capital and its populous southeast, including Sao Paulo and Rio de Janeiro, three hours behind UTC. |
| BST | British Summer Time | The daylight saving time of the United Kingdom, one hour ahead of GMT (UTC+1), used from the last Sunday in March to the last Sunday in October. |
| CAT | Central Africa Time | Two hours ahead of UTC year-round, Central Africa Time is used in Zambia, Zimbabwe, Malawi, Mozambique, Botswana, Rwanda, Burundi, Namibia, Sudan, South Sudan and the… |
| CDT | Central Daylight Time | Chicago, Dallas and Winnipeg move to CDT for the warmer months: five hours behind UTC, from the second Sunday in March to the first Sunday in November. |
| CEST | Central European Summer Time | Summer time of the Central European zone, UTC+2, in force from 01:00 UTC on the last Sunday in March to 01:00 UTC on the last Sunday in October. |
| CET | Central European Time | Winter time of most of continental Europe, UTC+1, including Germany, France, Italy, Spain, Poland, the Netherlands and Scandinavia, plus Algeria and Tunisia all year. |
| ChST | Chamorro Standard Time | Official time of Guam and the Northern Mariana Islands, US territories in the western Pacific, ten hours ahead of UTC. |
| CST | Central Standard Time (North America) | Winter time of the central United States and Canada, six hours behind UTC, used from the first Sunday in November to the second Sunday in March. |
| CT | Central Time | Generic label for the US Central Time Zone, covering CST (UTC−6) and CDT (UTC−5). |
| DST | Daylight saving time | Advancing clocks by one hour in warmer months so that evenings have more daylight. |
| EAT | East Africa Time | Used year-round in Kenya, Tanzania, Uganda, Ethiopia, Somalia, Eritrea, Djibouti and Madagascar, East Africa Time is three hours ahead of UTC. |
| EDT | Eastern Daylight Time | Daylight time for the US and Canadian Eastern zone, four hours behind UTC, observed from the second Sunday in March to the first Sunday in November. |
| EEST | Eastern European Summer Time | Finland, the Baltic states, Ukraine, Romania, Bulgaria, Greece and Cyprus move three hours ahead of UTC for EEST, from the last Sunday in March to the last Sunday in… |
| EET | Eastern European Time | Two hours ahead of UTC, Eastern European Time is the winter time of Finland, the Baltic states, Ukraine, Romania, Bulgaria, Greece and Cyprus, and the year-round time… |
| EST | Eastern Standard Time | Winter time of the eastern United States and Canada, five hours behind UTC, in effect from the first Sunday in November to the second Sunday in March. |
| ET | Eastern Time | Generic label for the time in the US Eastern Time Zone, covering both Eastern Standard Time (UTC−5) and Eastern Daylight Time (UTC−4). |
| GMT | Greenwich Mean Time | Mean solar time at the Royal Observatory in Greenwich, London, and the legal winter time of the UK. |
| GST | Gulf Standard Time | Year-round time of the United Arab Emirates and Oman, four hours ahead of UTC. |
| HKT | Hong Kong Time | Hong Kong's official time, UTC+8 all year, identical to China Standard Time. |
| HST | Hawaii-Aleutian Standard Time | Ten hours behind UTC, HST is the year-round time of Hawaii and the winter time of the western Aleutian Islands. |
| ICT | Indochina Time | Shared by Thailand, Vietnam, Cambodia and Laos, Indochina Time is seven hours ahead of UTC all year. |
| IDL | International Date Line | An imaginary line roughly following the 180° meridian through the Pacific Ocean, where the calendar date changes by one day. |
| IRST | Iran Standard Time | Iran's official time, UTC+3:30, one of the few half-hour offsets in the world. |
| IST | India Standard Time | UTC+5:30, the single time zone for all of India, also used in Sri Lanka. |
| JST | Japan Standard Time | Japan's single time zone, UTC+9, used year-round from Hokkaido to Okinawa. |
| KST | Korea Standard Time | South Korea's time, UTC+9 all year, the same as Japan. |
| LMT | Local mean time | Mean solar time at a specific longitude, used by towns before standard time zones. |
| LT | Local time | Clock time at a particular place, including its zone offset and any daylight saving. |
| MDT | Mountain Daylight Time | Summer time of the Mountain zone, six hours behind UTC, observed from the second Sunday in March to the first Sunday in November in places such as Denver, Salt Lake… |
| MSK | Moscow Standard Time | Moscow time, UTC+3 all year, used in Moscow, St. |
| MST | Mountain Standard Time | Seven hours behind UTC, MST is the winter time of the Rocky Mountain region of the US and Canada and the year-round time of most of Arizona. |
| MT | Mountain Time | Generic label for the US and Canadian Mountain Time Zone, covering MST (UTC−7) and MDT (UTC−6). |
| NDT | Newfoundland Daylight Time | Newfoundland's summer time, UTC−2:30, observed from the second Sunday in March to the first Sunday in November. |
| NPT | Nepal Time | One of the very few time zones with a 45-minute offset, UTC+5:45, used throughout Nepal. |
| NST | Newfoundland Standard Time | One of the few half-hour offsets in the Americas, UTC−3:30, used on the island of Newfoundland and in southeastern Labrador. |
| NZDT | New Zealand Daylight Time | UTC+13, New Zealand's summer time from the last Sunday in September to the first Sunday in April. |
| NZST | New Zealand Standard Time | New Zealand's winter time, UTC+12, used from the first Sunday in April to the last Sunday in September. |
| PDT | Pacific Daylight Time | Seven hours behind UTC, PDT is the warm-season clock of the US West Coast and British Columbia, observed from the second Sunday in March to the first Sunday in November. |
| PKT | Pakistan Standard Time | Pakistan's single time zone, UTC+5, used year-round in Karachi, Lahore and Islamabad. |
| PST | Pacific Standard Time | Winter time of the US West Coast, British Columbia and Baja California, eight hours behind UTC, in effect from the first Sunday in November to the second Sunday in March. |
| PT | Pacific Time | Generic label for the US and Canadian Pacific Time Zone, covering PST (UTC−8) and PDT (UTC−7). |
| SAST | South African Standard Time | Single year-round zone of South Africa, Lesotho and Eswatini, two hours ahead of UTC. |
| SGT | Singapore Standard Time | Singapore's official time, UTC+8, used all year. |
| SST | Samoa Standard Time | Time in American Samoa and Midway Atoll, eleven hours behind UTC, among the last places on Earth to see each day end. |
| TAI | International Atomic Time | A continuous time scale computed by the International Bureau of Weights and Measures from about 450 atomic clocks in more than 80 laboratories worldwide. |
| TRT | Turkey Time | Turkey's official time, UTC+3, kept all year since 2016 when the country stayed on summer time permanently. |
| UT1 | Universal Time 1 | Astronomical time based on Earth's actual rotation angle, measured by very-long-baseline radio interferometry of distant quasars. |
| UTC | Coordinated Universal Time | The primary time standard by which the world regulates clocks, kept within 0.9 second of mean solar time at 0° longitude by occasional leap seconds. |
| WAT | West Africa Time | Used in Nigeria, Cameroon, Angola, the western Democratic Republic of the Congo, Gabon, Niger and Chad, West Africa Time is one hour ahead of UTC, with no daylight… |
| WEST | Western European Summer Time | Portugal, Madeira, the Canary Islands and the Faroe Islands use WEST, UTC+1, from the last Sunday in March to the last Sunday in October. |
| WET | Western European Time | Winter time of Portugal (except the Azores), Madeira, the Canary Islands and the Faroe Islands, at UTC+0. |
| WIB | Waktu Indonesia Barat (Western Indonesia Time) | Western Indonesia Time, UTC+7, used on Sumatra, Java (including Jakarta) and western and central Kalimantan. |
| Z | Zulu time (UTC) | Military and aviation designation for UTC, written as a Z after a time, as in 1430Z. |
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