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The Standard Time Act of 1918 authorized the Interstate Commerce Commission to define each time zone. 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).
The Uniform Time Act introduced Daylight Saving Time uniformly in the United States, which Alaska would begin observing on April 28, 1968. [12] [13] The Uniform Time Act also defined four time zones that Alaska would use: [14] Bering Standard Time (UTC−11:00), used by the west coast (including Nome) and the Aleutian Islands. [15] [16]
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]
Standard time in the contiguous United States, illustration 1903. From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley.
This is a list of the time offsets by U.S. states, federal district, and territories. 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 economic reasons.
United States (Alaska Time Zone) Alaska. Except Aleutian Islands west of 169°30′W [6] UTC−08:00, U. Principal cities: Los Angeles, Vancouver, Tijuana.
After getting 30 minutes of daylight, the town of Utqiaġvik, Alaska – formerly known as Barrow – saw its final sunset of the year on Monday as it enters a "polar night." The sun won't return ...
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 ...