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GMT to MST converter
Greenwich Mean Time
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Mountain Time
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Mountain Time is 6 hours behind Greenwich Mean Time for most of the year, and 7 hours behind for part of it, because the two change their clocks on different dates (or only one of them changes at all).
When does the difference change?
In 2026:
- January 1 to March 7: Mountain Time is 7 hours behind Greenwich Mean Time
- March 8 to October 31: Mountain Time is 6 hours behind Greenwich Mean Time
- November 1 to December 31: Mountain Time is 7 hours behind Greenwich Mean Time
Questions
What time is 9 AM GMT in MST?
For most of the year, 9 AM Greenwich Mean Time is 3 AM Mountain Time. For part of the year it is 2 AM, because of daylight saving time.
How many hours ahead or behind is MST from GMT?
Mountain Time is 6 hours behind Greenwich Mean Time for most of the year, and 7 hours behind for part of it, because the two change their clocks on different dates (or only one of them changes at all).
Does the GMT to MST difference change?
Yes. It changes 2 times in 2026 because of daylight saving time.
About these time zones
GMT to MST, hour by hour
| Greenwich Mean Time | Mountain Time |
|---|---|
| 12 AM | 6 PM (previous day) |
| 1 AM | 7 PM (previous day) |
| 2 AM | 8 PM (previous day) |
| 3 AM | 9 PM (previous day) |
| 4 AM | 10 PM (previous day) |
| 5 AM | 11 PM (previous day) |
| 6 AM | 12 AM |
| 7 AM | 1 AM |
| 8 AM | 2 AM |
| 9 AM | 3 AM |
| 10 AM | 4 AM |
| 11 AM | 5 AM |
| 12 PM | 6 AM |
| 1 PM | 7 AM |
| 2 PM | 8 AM |
| 3 PM | 9 AM |
| 4 PM | 10 AM |
| 5 PM | 11 AM |
| 6 PM | 12 PM |
| 7 PM | 1 PM |
| 8 PM | 2 PM |
| 9 PM | 3 PM |
| 10 PM | 4 PM |
| 11 PM | 5 PM |
Based on the clocks on Monday, October 12, 2026. Use the converter above for another date.