What is the difference between UTC and MST?

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

Which time zone does this page use for UTC?

UTC. 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 UTC rather than the string "UTC".

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 UTC a daylight saving abbreviation?

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

UTC to MST

The gap between UTC and MST is 7 hours behind — UTC+0 against UTC-7.

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

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

What these abbreviations actually are

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

Common questions

What is the difference between UTC and MST?: MST is 7 hours behind of UTC. UTC means Coordinated Universal Time at UTC+0, and MST means Mountain Standard Time at UTC-7.
Which time zone does this page use for UTC?: UTC. 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 UTC rather than the string "UTC".
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 UTC a daylight saving abbreviation?: No. UTC is the standard-time abbreviation. When daylight saving is in force, the same zone uses a different one.