10:00 am GMT to MST — 3:00 am MST
10:00 am Greenwich Mean Time (GMT) is 3:00 am Mountain Time (MST) while both regions are on standard time. Neither zone changes this result during the year, so the same answer holds in January and in July.
Standard time
3:00 amApplies while neither zone is on daylight saving — broadly November to March in the northern hemisphere.
Convert a time
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GMT to MST — every hour
Both columns are computed from the IANA database, so they follow the real transition dates.
| GMT | MST — standard |
|---|---|
| 12:00 am | 5:00 pm (previous day) |
| 1:00 am | 6:00 pm (previous day) |
| 2:00 am | 7:00 pm (previous day) |
| 3:00 am | 8:00 pm (previous day) |
| 4:00 am | 9:00 pm (previous day) |
| 5:00 am | 10:00 pm (previous day) |
| 6:00 am | 11:00 pm (previous day) |
| 7:00 am | 12:00 am |
| 8:00 am | 1:00 am |
| 9:00 am | 2:00 am |
| 10:00 am | 3:00 am |
| 11:00 am | 4:00 am |
| 12:00 pm | 5:00 am |
| 1:00 pm | 6:00 am |
| 2:00 pm | 7:00 am |
| 3:00 pm | 8:00 am |
| 4:00 pm | 9:00 am |
| 5:00 pm | 10:00 am |
| 6:00 pm | 11:00 am |
| 7:00 pm | 12:00 pm |
| 8:00 pm | 1:00 pm |
| 9:00 pm | 2:00 pm |
| 10:00 pm | 3:00 pm |
| 11:00 pm | 4:00 pm |
Questions people ask
3:00 am MST. The gap between the two zones does not change during the year, so this holds all year.
It does not. Either both zones change their clocks on the same dates, or neither observes daylight saving, so the difference between them stays fixed.
Send a calendar invitation rather than a clock time in an email. Calendar software stores the underlying instant and re-renders it for each attendee, so a shifted offset is handled automatically.
Related conversions
Booking something recurring?
A fixed clock time drifts when either side changes its clocks. Our guides explain how to stop that happening.