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The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
Time in Russia: United States: 11: UTC−12:00 (AoE) – Baker Island and Howland Island UTC−11:00 – American Samoa, Jarvis Island, Kingman Reef, Midway Atoll and Palmyra Atoll UTC−10:00 – Hawaii, most of the Aleutian Islands, and Johnston Atoll UTC−09:00 – Most of the state of Alaska
The United States Standard Alaska Time was designated as UTC−10:00. [1] Some references prior to 1967 refer to this zone as Central Alaska Standard Time (CAST) [2] or as Alaska Standard Time (AKST). In 1966, the Uniform Time Act renamed the UTC−10:00 zone to Alaska-Hawaii Standard Time [3] (AHST [4]), effective April 1, 1967. [5]
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.
Time zones of the world. 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.
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
In 1900, "Alaska Standard Time" was established within the state as UTC−09:00. [8] In 1918, the United States Congress passed the Standard Time Act, which defined a standard time zone for Alaska - United States Standard Alaska Time, set at UTC−10:00. [9] On January 20, 1942, all of the United States, including Alaska, began to observe War ...
Before the adoption of four standard time zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local meridian, pre-corrected for the equation of time on the date of observation, to form local mean solar time. Noon occurred at different times but time differences between distant ...