Mountain Standard Time (MST) is UTC−7 Mountain Daylight Time (MDT) is UTC−6

The Mountain Time Zone subtracts seven hours from UTC during standard time (UTC−7) and six hours during daylight saving time (UTC−6).

This time zone is called Mountain Standard Time (MST) during standard time (Winter). It is called Mountain Daylight Time (MDT) during daylight saving time (Summer). In the United States and Canada, this time zone is often just called Mountain Time (MT).