Mountain Standard Time (MST)
Mountain Standard Time (MST) is UTC−7. It is the standard (winter) time of Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year; in summer the same area uses MDT (UTC−6).
Most of Arizona uses MST all year and does not switch to MDT.
Convert MST
Where MST is used
Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year.
Major cities on America/Denver
MST and daylight saving time
The next change is on 14 March 2027 at 01:59 local time: clocks go forward one hour, from MST (UTC−7) to MDT (UTC−6).
Convert MST to other time zones
MST FAQ
What is MST?
Mountain Standard Time (MST) is UTC−7. It is the standard (winter) time of Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year; in summer the same area uses MDT (UTC−6).
What is the current MST time?
MST is UTC−7. The live clock on this page shows the current Mountain Standard Time time, updated every second.
What is the difference between MST and MDT?
MDT is one hour ahead of MST. MST is the standard time; MDT is used during daylight saving time.
Is MST the same as MT?
MT (Mountain Time) is the year-round name. MST is the exact name used in winter. People often write MT when they mean whichever one is in force today.
Which countries use MST?
MST is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year.
Updated 6 November 2026. Time zone data: IANA tz database.