Mountain Time Zone - Wikipedia
https://en.wikipedia.org/wiki/Mountain_Time_Zone
OverviewCanadaMexicoUnited StatesMajor metropolitan areasSee alsoExternal linksThe Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time (UTC−07:00) is in effect, and by subtracting six hours during daylight saving time (UTC−06:00). The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich Observatory. In the United States, the exact specificatio…
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