MST: Mountain Standard Time

US & Canada Mountain

3:22:31am

03:22 on a 24-hour clock

Sunday, 27th September 2026

UTC-6 America/Denver 2 different meanings

What MST actually is

UTC-7 in winter, UTC-6 (MDT) in summer.

Careful: US & Canada Mountain is not on MST at the moment. It is currently MDT (UTC-6) because of daylight saving.

MST means 2 different things

This is the whole reason calendar software uses IANA identifiers instead of abbreviations. All of them, live:

US & Canada Mountain

3:22am

America/Denver UTC-6 now MDT

UTC-7 in winter, UTC-6 (MDT) in summer.

Clocks go back 1 hour on Sunday, 1st November 2026, at 1:59 am local time (1:00 am after the change).

Denver Calgary Albuquerque

Arizona: MST all year

2:22am

America/Phoenix UTC-7 now MST

Arizona stays on MST year-round. In summer its clocks match Los Angeles, not Denver.

Clocks here do not change: this zone stays on the same offset all year.

Phoenix Tucson

Convert MST

MST to EST MST to PST MST to IST MST to CET MST to London MST to New York Convert to anywhere

Looking for UTC and GMT developer tooling (epoch conversion, ISO 8601, a free time API)? That lives on our sibling site utctime.app.

Other abbreviations

All time zones → Everywhere at UTC-6

Questions people ask

What time is it in MST right now?

3:22 am (03:22) on Sunday, 27th September 2026, for US & Canada Mountain. Careful: MST means 2 different things. The other meanings and their current times are listed below.

What does MST stand for?

Mountain Standard Time. UTC-7 in winter, UTC-6 (MDT) in summer.

What is the UTC offset of MST?

US & Canada Mountain: UTC-6; Arizona: MST all year: UTC-7.

Why does MST mean more than one time zone?

Time-zone abbreviations were never standardised: several countries independently picked the same letters. MST is one of the worst offenders, with 2 meanings in current use. This is why calendar software and databases use IANA identifiers like America/Denver instead: they are unique, and they carry the daylight-saving rules with them.