UTC to MST Time Converter
MST is 6 hours behind UTC. UTC is the zero point, UTC±00:00, and The US Mountain states are currently on MDT (UTC-6:00).
Best Time to Call Between UTC and MST
Both zones are inside normal business hours between 3:00 PM and 5:00 PM UTC — that's 9:00 AM to 11:00 AM MST. That's a 2-hour window.
both at work UTC only MST only neither — hours along the strip are UTC.
Common Times Converted
UTC on the left, MST on the right.
UTC to MST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| UTC | MST | Working hours |
|---|---|---|
| 12:00 AM | 6:00 PM prev day | — |
| 1:00 AM | 7:00 PM prev day | — |
| 2:00 AM | 8:00 PM prev day | — |
| 3:00 AM | 9:00 PM prev day | — |
| 4:00 AM | 10:00 PM prev day | — |
| 5:00 AM | 11:00 PM prev day | — |
| 6:00 AM | 12:00 AM | — |
| 7:00 AM | 1:00 AM | — |
| 8:00 AM | 2:00 AM | — |
| 9:00 AM | 3:00 AM | UTC only |
| 10:00 AM | 4:00 AM | UTC only |
| 11:00 AM | 5:00 AM | UTC only |
| 12:00 PM | 6:00 AM | UTC only |
| 1:00 PM | 7:00 AM | UTC only |
| 2:00 PM | 8:00 AM | UTC only |
| 3:00 PM | 9:00 AM | Both zones |
| 4:00 PM | 10:00 AM | Both zones |
| 5:00 PM | 11:00 AM | MST only |
| 6:00 PM | 12:00 PM | MST only |
| 7:00 PM | 1:00 PM | MST only |
| 8:00 PM | 2:00 PM | MST only |
| 9:00 PM | 3:00 PM | MST only |
| 10:00 PM | 4:00 PM | MST only |
| 11:00 PM | 5:00 PM | — |
What UTC and MST Actually Are
UTC — Coordinated Universal Time
The global reference standard. Aviation, computing and science run on it. Standing at UTC as written, and the region does not change its clocks, so that offset holds all year.
UTC is not a place. It is a computed standard, kept within a second of mean solar time at Greenwich by atomic clocks, and it is the reference every other zone is defined against.
MST — Mountain Standard Time
Denver, Salt Lake City, Calgary — and Phoenix year-round. Standing at UTC-7:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to MST. Arizona stays on MST all year, so Phoenix and Denver are an hour apart for eight months and identical for four.
Arizona has stayed on MST year-round since 1968 — the Navajo Nation within it does observe daylight saving, making the state a patchwork.
What This Means in Practice
This gap is not fixed
MST changes its clocks and UTC does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Major Cities in Each Zone
Cities on MST
Frequently Asked Questions
What is the time difference between UTC and MST?
MST is 6 hours behind UTC. That is the live figure. Taken strictly as written, the gap between UTC and MST is 7 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM UTC in MST?
9:00 AM UTC is 3:00 AM MST.
What are the best hours to schedule a call between UTC and MST?
Between 3:00 PM and 5:00 PM UTC, which is 9:00 AM to 11:00 AM MST. Both sides are inside normal business hours through that window.
Does the difference between UTC and MST change during the year?
Yes. MST observes daylight saving and UTC does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.
Does MST always mean Mountain Standard Time?
Arizona stays on MST all year, so Phoenix and Denver are an hour apart for eight months and identical for four.