GMT to MST Converter – Convert GMT to Mountain Time
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Complete GMT ↔ MST Conversion Table
All 24 hours · Both DST seasons · Best meeting windows marked ★
| GMT Time | MST Standard Season UTC+0 Standard · UTC+0 → UTC−7 (−7h) |
MDT Daylight Season MDT Daylight · UTC+0 → MDT (−6h) |
|---|---|---|
| 12:00 AM (midnight) | prev 5:00 PM | prev 6:00 PM |
| 1:00 AM | prev 6:00 PM | prev 7:00 PM |
| 2:00 AM | prev 7:00 PM | prev 8:00 PM |
| 3:00 AM | prev 8:00 PM | prev 9:00 PM |
| 4:00 AM | prev 9:00 PM | prev 10:00 PM |
| 5:00 AM | prev 10:00 PM | prev 11:00 PM |
| 6:00 AM | prev 11:00 PM | 12:00 AM |
| 7:00 AM | 12:00 AM | 1:00 AM |
| 8:00 AM | 1:00 AM | 2:00 AM |
| 9:00 AM | 2:00 AM | 3:00 AM |
| 10:00 AM | 3:00 AM | 4:00 AM |
| 11:00 AM | 4:00 AM | 5:00 AM |
| 12:00 PM (noon) | 5:00 AM | 6:00 AM |
| 1:00 PM | 6:00 AM | 7:00 AM |
| 2:00 PM | 7:00 AM | 8:00 AM |
| ★ 3:00 PM | 8:00 AM | ★ 9:00 AM |
| ★ 4:00 PM | ★ 9:00 AM | ★ 10:00 AM |
| 5:00 PM | 10:00 AM | 11:00 AM |
| 6:00 PM | 11:00 AM | 12:00 PM |
| 7:00 PM | 12:00 PM | 1:00 PM |
| 8:00 PM | 1:00 PM | 2:00 PM |
| 9:00 PM | 2:00 PM | 3:00 PM |
| 10:00 PM | 3:00 PM | 4:00 PM |
| 11:00 PM | 4:00 PM | 5:00 PM |
What is the time difference between GMT and MST?
MST is 7 hours behind GMT. Both regions observe Daylight Saving Time, so the gap stays close to 7 hours year-round. 9:00 AM GMT = 2:00 AM MST. 12:00 PM GMT = 5:00 AM MST. 5:00 PM GMT = 10:00 AM MST.
What is the best time to call from London to Denver?
The business hours overlap between GMT and MST runs from 4:00 PM to 5:00 PM GMT (9:00 AM to 10:00 AM MST). Scheduling calls in this window keeps both sides within normal working hours.
Frequently Asked Questions about GMT and MST
MST is 7 hours behind GMT, so to convert mentally, subtract 7 hours to your GMT time. For example: 9:00 AM GMT = 2:00 AM MST. Our converter automatically adjusts for Daylight Saving Time so you always get the right result.
MST (Mountain Standard Time, UTC-7) is 7 hours behind GMT (Greenwich Mean Time, UTC+0) during standard time. For example, 9:00 AM GMT = 2:00 AM MST. During DST periods, this difference changes by 1 hour when one or both zones observe Daylight Saving Time - our converter automatically applies the correct offset for any date you select.
The best overlap for standard business hours (9 AM–5 PM) in both zones is 16:00–17:00 GMT = 09:00–10:00 MST. Schedule recurring calls in this window to keep both sides within normal working hours. Remember to re-check the window in March and November (or March/October for European zones) when DST transitions can shift the overlap by 1 hour.
Yes. GMT (Greenwich Mean Time) observes Daylight Saving Time. Clocks spring forward to BST (UTC+1) on the last Sunday in March, and fall back to GMT on the last Sunday in October. During the DST period, the difference with MST changes by 1 hour. In summer the UK switches to BST (British Summer Time, UTC+1). The GMT label itself never changes; it always means UTC+0. Our converter always uses the current offset for the date you select.
Major cities in the GMT (Greenwich Mean Time, UTC+0) timezone include: London (winter), Dublin (winter), Edinburgh, Reykjavik, Accra, Dakar. These cities switch to BST (UTC+1) from the last Sunday in March to the last Sunday in October.
Major cities in the MST (Mountain Standard Time, UTC-7) timezone include: Denver, Salt Lake City, Calgary, Albuquerque, Boise. These cities switch to MDT (UTC-6) from the second Sunday in March to the first Sunday in November.
MST is 7 hours behind GMT. The best overlap for business hours is 16:00–17:00 GMT = 09:00–10:00 MST. Always include both local times in calendar invites (for example, "2:00 PM GMT / 7:00 AM MST MST"). Double-check around March and November (or March/October for European zones) when DST transitions can shift the offset by 1 hour. For full scheduling guidance, see our international meeting times guide.
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