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The Mountain Time 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 daylight saving time in the
spring, summer, and early autumn (UTC-6). The clock time in this zone is based on the
mean solar time of the 105th degree meridian west of the Greenwich Observatory.
In the United States and Canada, this time zone is generically
called Mountain Time (MT). Specifically, it is Mountain Standard Time (MST) when
observing standard time (Winter), and Mountain Daylight Time (MDT) when observing
daylight saving time.
The zone is one hour ahead of the
Pacific Time Zone, one hour
behind the Central Time Zone
and two hours behind the Eastern Time Zone.
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