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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.
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 ...
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset.
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
America/Creston 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
In equatorial regions, DST is not useful because of the stability of light levels throughout the year. As a result, large areas of South America do not observe DST. DST is used in some of the more southerly countries such as Paraguay and most of Chile. These countries or regions in South America do not use daylight saving time: Argentina ...
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.
Yukon Standard Time is the informal name of a time zone established in 2020 and used in the territory of Yukon in Canada. "Yukon Standard Time" is more formally referred to as year-round Mountain Standard Time (MST) but unlike other Mountain Time (MT, or MST/MDT) regions it does not observe daylight saving time, giving it a year-round calculation by subtracting seven hours from Coordinated ...