logo

Video encyclopedia

Mountain Time Zone

3:36

I Crossed the Time Zone Bridge, Pacific to Mountain Time

1:49

Mountain Time Zones

0:29

Entering Mountain Time Zone

0:21

mountain time zone

2:57

Time Zones

The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time is in effect, and by subtracting six hours during daylight saving time (UTC−6). 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 specification for the location of time zones and the dividing lines between zones is set forth in the Code of Federal Regulations at 49 CFR 71.
  • Canada 

  • Mexico 

  • United States