MST to GMT Converter
Understanding MST and GMT Time Zones
Mountain Standard Time (MST)
Mountain Standard Time is observed in undefined and uses the offset UTC-7. Major cities in this time zone include Denver, Phoenix, Salt Lake City, Albuquerque. This time zone serves a significant global region with important economic and cultural hubs.
Greenwich Mean Time (GMT)
Greenwich Mean Time operates at UTC+0, covering undefined. Key cities include London, Dublin, Lisbon. The 7-hour forward offset from MST means that when professionals in Denver start their workday at 9:00 AM, it is already 4:00 PM in London.
MST is also commonly referred to as Mountain Time, MT, Arizona time, Denver time. GMT is also known as London time, UK time, British time, England time. So if you are searching for Mountain Time to London time, this is the same conversion as MST to GMT.
Complete MST to GMT Conversion Table
The table below shows every two-hour increment converted from Mountain Standard Time to Greenwich Mean Time. Business hours (9 AM – 5 PM) are highlighted for easy scheduling reference.
| MST (Mountain Standard Time) | GMT (Greenwich Mean Time) |
|---|---|
| 12:00 AM (00:00) | 7:00 AM (07:00) |
| 2:00 AM (02:00) | 9:00 AM (09:00) |
| 4:00 AM (04:00) | 11:00 AM (11:00) |
| 6:00 AM (06:00) | 1:00 PM (13:00) |
| 8:00 AM (08:00) | 3:00 PM (15:00) |
| 10:00 AM (10:00) | 5:00 PM (17:00) |
| 12:00 PM (12:00) | 7:00 PM (19:00) |
| 2:00 PM (14:00) | 9:00 PM (21:00) |
| 4:00 PM (16:00) | 11:00 PM (23:00) |
| 6:00 PM (18:00) | 1:00 AM (01:00) (next day) |
| 8:00 PM (20:00) | 3:00 AM (03:00) (next day) |
| 10:00 PM (22:00) | 5:00 AM (05:00) (next day) |
Times shown in 12-hour and 24-hour format. Last updated 2026-03-09.
Scheduling Between MST and GMT
For business scheduling, the optimal overlap window between MST and GMT falls roughly between 9:00 AM and 10:00 AM MST. This ensures both Denver and London teams are within standard working hours.
The significant 7-hour gap between MST and GMT means that finding overlapping working hours requires compromise from at least one side. Consider adopting asynchronous workflows — recorded video updates, shared documents, and time-zone-aware project management tools — to supplement the limited real-time overlap.
Travel Between Denver and London
Travelers flying from Denver to London should adjust their sleep schedule 7 days before departure at a rate of one hour per day. For this significant time difference, gradual adjustment reduces jet lag dramatically.
Medical experts recommend allowing approximately one day of adjustment per hour of time difference. For the 7-hour shift between MST and GMT, plan for roughly one week of gradual adjustment for optimal performance.
Daylight Saving Time Considerations
During standard time months (November through March in the US), this offset is fixed. However, if either zone observes daylight saving time, the difference may temporarily shift by one hour during transition weeks in spring and autumn.
For the MST to GMT conversion specifically: MST (UTC-7) and GMT (UTC+0) both observe DST. When both zones transition on different dates, the offset temporarily shifts by one hour for a few weeks. Always verify during March–April and October–November.
Related Time Zone Conversions
References & Resources
Frequently Asked Questions
MST (Mountain Standard Time) is 7 hours behind GMT (Greenwich Mean Time). MST is UTC-7 and GMT is UTC+0.
When it is 12:00 PM (noon) in MST, it is 7:00 PM in GMT.
The best overlap for business hours is approximately 4:00 PM to 12:00 AM GMT, which corresponds to 9:00 AM to 5:00 PM in MST.
During standard time months (November through March in the US), this offset is fixed. However, if either zone observes daylight saving time, the difference may temporarily shift by one hour during transition weeks in spring and autumn.