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 Pacific Time Zone (PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time (UTC−8).
This is a list of U.S. states by time zone. For more information about time zones, please see: time zone. Most of the United States uses Daylight Saving Time (DST). In the list, it will say if the state or territory does not use DST.