Mountain Daylight Time or MDT is the Mountain Standard Time Zone (or MST) during Daylight Savings Time. MST is UTC-7 The Mountain Standard Time Zone (MST) is a geographic region that keeps time by subtracting seven hours from Coordinated Universal Time (UTC), resulting in UTC-7. ... Daylight saving time (DST), often referred to as daylight savings time, is a widely used system of adjusting the official local time forward, usually one hour, from its official standard time for the summer months. ...
It operates under MST+1 or UTC-6. It has been suggested that leap second be merged into this article or section. ...
Daylight saving time (DST), often referred to as daylight savings time, is a widely used system of adjusting the official local time forward, usually one hour, from its official winter standard time for the duration of the spring and summer months.
The PRC now uses one universal time zone for all of the nation from Urumqi in the northwest to Fujian in the southeast; the size of the nation was a major factor why DST was not considered practical in China.
In response to the 1973 energy crisis, daylight saving in the United States was begun earlier in both 1974 and 1975, commencing on the first Sunday in January (January 6) in the former year and the last Sunday in February (February 23) in the latter.
The MountainTime Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC-7) during the short days of autumn, winter and spring), and by subtracting six hours during the Daylight Saving days of spring, summer, and early autumn.
In Canada, MountainTime is observed in the province of Alberta, the Northwest Territories (except for Tungsten), the Kitikmeot Region of Nunavut and the part of Saskatchewan immediately surrounding the city of Lloydminster.
Arizona does not observe Daylight Saving Time, a period of time between April and October in which the rest of the MountainTime Zone keeps time by subtracting six hours from UTC (UTC-6.) However, the Navajo Nation, the bulk of whose area is within Arizona, observes Daylight Saving Time throughout its territory.
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