Mountain time

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Moun·tain time the standard time in a zone including parts of the US and Canada in or near the Rocky Mountains, specifically: ∎  (Mountain Standard Time abbrev.: MST) standard time based on the mean solar time at the meridian 105° W., seven hours behind GMT. ∎  (Mountain Daylight Time abbrev.: MDT) Mountain time during daylight saving time, eight hours behind GMT.

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Mountain time

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