MST to GMT Converter
Mountain Standard Time (MST) sits 7 hours behind Greenwich Mean Time (GMT). Whether you’re coordinating a transatlantic call or planning your next trip to North America, this converter helps you work out the time difference between these zones instantly.
GMT serves as the UK’s winter time and remains the baseline for global timekeeping. MST covers major cities like Denver, Phoenix, and Calgary across the United States, Canada, and Mexico.
Conversion Result
Quick Conversions
MST to GMT Conversion Table
This table shows the time equivalents between MST and GMT throughout the day. Each MST time corresponds to a GMT time exactly 7 hours ahead.
| MST (UTC-7) | GMT (UTC+0) | MST (UTC-7) | GMT (UTC+0) |
|---|---|---|---|
| 00:00 (Midnight) | 07:00 | 12:00 (Noon) | 19:00 |
| 01:00 | 08:00 | 13:00 | 20:00 |
| 02:00 | 09:00 | 14:00 | 21:00 |
| 03:00 | 10:00 | 15:00 | 22:00 |
| 04:00 | 11:00 | 16:00 | 23:00 |
| 05:00 | 12:00 (Noon) | 17:00 | 00:00 (Next day) |
| 06:00 | 13:00 | 18:00 | 01:00 (Next day) |
| 07:00 | 14:00 | 19:00 | 02:00 (Next day) |
| 08:00 | 15:00 | 20:00 | 03:00 (Next day) |
| 09:00 | 16:00 | 21:00 | 04:00 (Next day) |
| 10:00 | 17:00 | 22:00 | 05:00 (Next day) |
| 11:00 | 18:00 | 23:00 | 06:00 (Next day) |
How to Convert MST to GMT
Converting between these time zones requires a simple addition. The process stays consistent regardless of the date or season, as long as both zones remain on standard time.
Conversion Formula:
GMT Time = MST Time + 7 hours
Step-by-Step Conversion
Follow these steps to convert any MST time to GMT:
- Take your current MST time
- Add 7 hours to reach GMT
- If the result exceeds 24:00, subtract 24 and add one day
- Double-check whether daylight saving affects your specific date
Important: When MST regions observe Mountain Daylight Time (MDT) during summer months, the offset changes to UTC-6. This means the difference between MDT and GMT becomes 6 hours instead of 7. Always verify which time standard applies to your specific date.
Time Zone Contexts
Mountain Standard Time
MST operates at UTC-7:00 across parts of North America. Major population centres include Phoenix (which stays on MST year-round), Denver, Calgary, and Edmonton.
Most areas switch to Mountain Daylight Time (MDT, UTC-6) from March to November, but Arizona (except the Navajo Nation) and parts of northern Mexico maintain MST throughout the year.
Greenwich Mean Time
GMT originated at the Royal Observatory in Greenwich, London. Britain adopted it as the national standard in 1880, and by 1884 it became the world’s time reference point.
The UK uses GMT from late October to late March. During British Summer Time (BST), the country moves to UTC+1. Many still refer to UK time as GMT informally, though UTC has technically replaced it as the scientific standard.
Scheduling Across Time Zones
When arranging meetings or calls between MST and GMT locations, timing matters significantly. The 7-hour gap means your afternoon in Denver becomes late evening in London.
Best Meeting Windows
For professional calls that suit both zones, consider these options:
- 8:00-10:00 MST converts to 15:00-17:00 GMT (mid-afternoon UK time)
- 9:00-11:00 MST converts to 16:00-18:00 GMT (end of UK working day)
- 7:00-9:00 MST converts to 14:00-16:00 GMT (early afternoon UK)
Evening calls from the UK (18:00-20:00 GMT) translate to 11:00-13:00 MST, which works well for North American lunch breaks.
Everyday Examples
Here’s how the time difference affects common situations:
Live Sports Broadcasting: An NFL match kicking off at 13:00 MST in Denver reaches UK viewers at 20:00 GMT – prime evening viewing.
Stock Market Hours: When New York markets open at 09:30 EST (08:30 MST), it’s already 15:30 GMT in London. The London Stock Exchange closes at 16:30 GMT, which is 09:30 MST – just as North American traders start their day.
Family Video Calls: If your relatives in Calgary eat dinner at 18:00 MST, you’ll need to ring them at 01:00 GMT the following day – not ideal for UK residents! A better option: catch them at 09:00 MST breakfast time, which is 16:00 GMT for you.
Related Time Conversions
Other North American time zones you might need alongside MST and GMT:
| Time Zone | UTC Offset | Difference from GMT |
|---|---|---|
| Pacific Standard Time (PST) | UTC-8 | 8 hours behind GMT |
| Mountain Standard Time (MST) | UTC-7 | 7 hours behind GMT |
| Central Standard Time (CST) | UTC-6 | 6 hours behind GMT |
| Eastern Standard Time (EST) | UTC-5 | 5 hours behind GMT |
| British Summer Time (BST) | UTC+1 | 1 hour ahead of GMT |