GMT to MST Time Converter
Convert Greenwich Mean Time to Mountain Time instantly.
Scroll the timeline to check any hour of the day.
Greenwich Mean Time
GMT
6:06
Mountain Time
MST
12:06
MST is on daylight savings (MDT) right now, while GMT stays at UTC+0 all year.
Search any city, build a custom world clock, and plan across more time zones and options in the FlutterTime app. Free.
How the GMT to MST time difference works
MST is 6 hours behind GMT. Greenwich Mean Time (GMT) is the fixed UTC+0 reference time, used by the United Kingdom and Ireland in winter. Mountain Time (MST) is the US Mountain time zone. For example, 9:00 AM GMT is 3:00 AM MST. Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
Time difference
6 hours
Daylight saving
MST only
GMT offset
UTC+0
MST offset
UTC-7
GMT to MST conversion chart
| Greenwich Mean Time (GMT) | Mountain Time (MST) |
|---|---|
| 12:00 AM | 6:00 PM -1 day |
| 1:00 AM | 7:00 PM -1 day |
| 2:00 AM | 8:00 PM -1 day |
| 3:00 AM | 9:00 PM -1 day |
| 4:00 AM | 10:00 PM -1 day |
| 5:00 AM | 11:00 PM -1 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 |
| 10:00 AM | 4:00 AM |
| 11:00 AM | 5:00 AM |
| 12:00 PM | 6:00 AM |
| 1:00 PM | 7:00 AM |
| 2:00 PM | 8:00 AM |
| 3:00 PM | 9:00 AM |
| 4:00 PM | 10:00 AM |
| 5:00 PM | 11:00 AM |
| 6:00 PM | 12:00 PM |
| 7:00 PM | 1:00 PM |
| 8:00 PM | 2:00 PM |
| 9:00 PM | 3:00 PM |
| 10:00 PM | 4:00 PM |
| 11:00 PM | 5:00 PM |
Best time to meet
A standard 9 to 5 workday overlaps from 3:00 PM to 5:00 PM GMT (9:00 AM to 11:00 AM MST). Schedule inside that window to catch both coasts during business hours.
Cities in each time zone
Greenwich Mean Time (GMT)
LondonDublinLisbonEdinburghManchester
Mountain Time (MST)
DenverSalt Lake CityAlbuquerqueBoiseColorado Springs
GMT to MST questions
Is MST ahead of or behind GMT?
MST is 6 hours behind GMT. So 9:00 AM GMT is 3:00 AM MST, and 5:00 PM GMT is 11:00 AM MST.
What time is it in MST when it is 12:00 PM GMT?
When it is 12:00 PM (noon) GMT in Greenwich Mean Time, it is 6:00 AM MST in Mountain Time.
How many hours difference is there between GMT and MST?
There is a 6 hours difference. Mountain Time (MST) runs 6 hours behind Greenwich Mean Time (GMT).
Do GMT and MST observe daylight saving time?
Mountain Time observes daylight saving time but Greenwich Mean Time does not, so the difference between them changes by an hour twice a year. The United Kingdom and Ireland use GMT only in winter; from late March to late October they switch to British Summer Time (BST), one hour ahead of GMT.
What is the best time to schedule a meeting between GMT and MST?
A standard 9-to-5 workday overlaps from 3:00 PM to 5:00 PM GMT (9:00 AM to 11:00 AM MST). Scheduling inside that window keeps the call during business hours in both Greenwich Mean Time and Mountain Time.
Which cities use GMT and MST?
Greenwich Mean Time (GMT) covers cities such as London, Dublin, Lisbon, Edinburgh, Manchester. Mountain Time (MST) covers cities such as Denver, Salt Lake City, Albuquerque, Boise, Colorado Springs.