GMT to MST Converter – Convert GMT to Mountain Time

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.