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The zone takes its name from the two areas it includes: Hawaii and the portion of Alaska 's Aleutian Islands west of 169° 30 ′ W longitude. During daylight saving time (DST), the Alaskan portion observes Hawaii–Aleutian Daylight Time (HDT, UTC−09:00 ), while Hawaii stays on standard time. Hawaii has not observed daylight saving time ...
Guyana Time: UTC−04: HDT: Hawaii–Aleutian Daylight Time: UTC−09: HAEC: Heure Avancée d'Europe Centrale French-language name for CEST UTC+02: HST: Hawaii–Aleutian Standard Time: UTC−10: HKT: Hong Kong Time: UTC+08: HMT: Heard and McDonald Islands Time UTC+05: HOVST: Hovd Summer Time (not used from 2017-present) UTC+08: HOVT: Hovd Time ...
Hawaii began observing Hawaiian Standard Time on January 13, 1896, at noon. On May 19, 1947, the Legislature approved a bill to change Hawaiian Standard Time to UTC−10:00, which would go into effect on June 8, 1947. After the Uniform Time Act was passed in 1966, Hawaii was placed in the new Alaska–Hawaii Time Zone. On March 30, 1967, the ...
This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round. The main purpose of this page is to list the current standard time offsets ...
The Pacific Time Zone ( PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time ( UTC−08:00 ). During daylight saving time, a time offset of UTC−07:00 is used.
Universal Time ( UT or UT1) is a time standard based on Earth's rotation. [1] While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult. Therefore, UT1 is computed from a measure of the Earth's angle with respect to the International Celestial Reference Frame (ICRF), called the Earth Rotation Angle ...
Time zone. Greenwich Mean Time is defined in law as standard time in the following countries and areas, which also advance their clocks one hour (GMT+1) in summer. United Kingdom, where the summer time is called British Summer Time ( BST) Ireland, where it is called Winter Time, [22] changing to Standard Time in summer.
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.