What is the difference between MST and UTC?

UTC is 7 hours ahead of MST. MST means Mountain Standard Time at UTC-7, and UTC means Coordinated Universal Time at UTC+0.

Which time zone does this page use for MST?

America/Denver. An abbreviation is not a time zone — it is a label a zone wears for part of the year — so every calculation here uses a named IANA zone and says which one. If you are writing code, use America/Denver rather than the string "MST".

Does MST mean anything else?

Yes: Mountain Standard Time (Arizona) at UTC-7. Arizona keeps MST all year, so for half the year it matches Pacific time rather than Mountain.

Is MST a daylight saving abbreviation?

No. MST is the standard-time abbreviation. When daylight saving is in force, the same zone uses a different one.

MST to UTC

Converting MST to UTC means moving from UTC-7 to UTC+0 — a shift of 7 hours ahead.

Convert a time

From

Date

Time

Converted time

—

The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

Computed on a date when MST is genuinely in force — using today would be wrong for half the year, because a standard-time abbreviation does not exist in summer.

MST	UTC
00:00	07:00
01:00	08:00
02:00	09:00
03:00	10:00
04:00	11:00
05:00	12:00
06:00	13:00
07:00	14:00
08:00	15:00
09:00	16:00
10:00	17:00
11:00	18:00
12:00	19:00
13:00	20:00
14:00	21:00
15:00	22:00
16:00	23:00
17:00	00:00next day
18:00	01:00next day
19:00	02:00next day
20:00	03:00next day
21:00	04:00next day
22:00	05:00next day
23:00	06:00next day

What these abbreviations actually are

	MST	UTC
Full name	Mountain Standard Time	Coordinated Universal Time
Representative zone	America/Denver	UTC
Offset	UTC-7	UTC+0
Seasonal	Standard time	Standard time
Zone changes in 2026	2	0
Other meanings	1	None in common use

Common questions

What is the difference between MST and UTC?: UTC is 7 hours ahead of MST. MST means Mountain Standard Time at UTC-7, and UTC means Coordinated Universal Time at UTC+0.
Which time zone does this page use for MST?: America/Denver. An abbreviation is not a time zone — it is a label a zone wears for part of the year — so every calculation here uses a named IANA zone and says which one. If you are writing code, use America/Denver rather than the string "MST".
Does MST mean anything else?: Yes: Mountain Standard Time (Arizona) at UTC-7. Arizona keeps MST all year, so for half the year it matches Pacific time rather than Mountain.
Is MST a daylight saving abbreviation?: No. MST is the standard-time abbreviation. When daylight saving is in force, the same zone uses a different one.