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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.
MST - BC (Creston) −07:00: −07:00: Redirects to America/Phoenix Places in Pacific Time that have not observed DST since the database cut-off date (1970) 6446092 on OpenStreetMap: CA +5546−12014 America/Dawson_Creek MST - BC (Dawson Cr, Ft St John) −07:00: −07:00: Places in Mountain Time that stopped using DST in 1973 6483979 on ...
The database attempts to record historical time zones and all civil changes since 1970, the Unix time epoch. [7] It also records leap seconds. [8] The database, as well as some reference source code, is in the public domain. [9] New editions of the database and code are published as changes warrant, usually several times per year. [10]
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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.
In the United States and Canada, the Mountain Time Zone is to the east of the Pacific Time Zone and to the west of the Central Time Zone. In some areas, starting in 2007, the local time changes from MST to MDT at 2 am MST to 3 am MDT on the second Sunday in March and returns at 2 am MDT to 1 am MST on the first Sunday in November.
In 1912, the first law was passed that called for the use of standard time.This law left the choice of time zone up to the municipal government. The result was a patchwork of towns following either of the two neighbouring time zones—Mountain Standard Time (MST) or Central Standard Time—with or without daylight saving time.
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. [21] Portugal (with the exception of ...