MST
Mountain Standard Time
US Mountain West (winter)
Now in Denver:
MST — Mountain Standard Time
Quick facts
- Abbreviation
- MST
- Full name
- Mountain Standard Time
- UTC offset
- UTC-7
- Type
- Standard time
- Seasonal pair
- MDT (UTC-6)
- Used in
- US Mountain West (winter)
- Example zone
- America/Denver
Cities that use MST
About MST
MST is the abbreviation for Mountain Standard Time, a time zone offset of UTC-7. It applies in US Mountain West (winter). It is the standard, winter offset; in summer the same region switches to MDT (UTC-6).
Arizona stays on MST all year — it does not switch to MDT.
Time-zone abbreviations are convenient but not unique or official — several codes are shared by more than one zone. When precision matters, use the underlying IANA zone name (for example America/Denver) or the UTC offset UTC-7 instead.
Frequently asked questions
- What does MST stand for?
- MST stands for Mountain Standard Time. It is UTC-7, used in US Mountain West (winter). Arizona stays on MST all year — it does not switch to MDT.
- What is the UTC offset of MST?
- MST (Mountain Standard Time) is UTC-7, meaning it is 7 hours behind Coordinated Universal Time.
- What is the daylight-saving version of MST?
- MST is the winter (standard) abbreviation. Its counterpart is MDT (Mountain Daylight Time, UTC-6), used in the other half of the year.
See also: all time zone abbreviations