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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 2024b of the tz database. [2]
The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (UTC−09:00). During daylight saving time its time offset is eight hours ( UTC−08:00 ). The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory .
If present, a dagger (†) indicates the usage of a nautical time zone letter outside of the standard geographic definition of that time zone. Some zones that are north/south of each other in the mid Pacific differ by 24 hours in time – they have the same time of day but dates that are one day apart.
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.
UTC−08:00 – Pacific Time zone: the Pacific coast states, the Idaho Panhandle and most of Nevada and Oregon UTC−07:00 – Mountain Time zone: most of Idaho, part of Oregon, and the Mountain states plus western parts of some adjacent states UTC−06:00 – Central Time zone: a large area spanning from the Gulf Coast to the Great Lakes
List of time zones by country – sorted by number of current time zones in the world; List of UTC offsets – current UTC offsets; List of time zone abbreviations – abbreviations; List of tz database time zones – zones used by many computer systems as defined by IANA; List of military time zones; Country-specific: List of time zones by U.S ...
Pale colours: Standard time observed all year Dark colours: Summer time observed Europe spans seven primary time zones (from UTC−01:00 to UTC+05:00), excluding summer time offsets (five of them can be seen on the map, with one further-western zone containing the Azores, and one further-eastern zone spanning the Ural regions of Russia and European part of Kazakhstan).
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 ...