MST to GMT Converter & Meeting Planner
Quick answer: 9:00 AM MST = 4:00 PM GMT (fixed -07:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Mountain Standard Time (MST) and Greenwich Mean Time (GMT)? You need to account for the standard time difference. Greenwich Mean Time is normally 7 hours ahead of Mountain Standard Time. Whether you are coordinating between teams in Denver and Phoenix and London and Dublin, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM MST = 7:00 AM GMT. The full 24-hour MST to GMT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM MST = 10:00 PM GMT.
| MST Time | GMT Time |
|---|---|
| 12:00 AM (00:00) | 7:00 AM (07:00) |
| 1:00 AM (01:00) | 8:00 AM (08:00) |
| 2:00 AM (02:00) | 9:00 AM (09:00) |
| 3:00 AM (03:00) | 10:00 AM (10:00) |
| 4:00 AM (04:00) | 11:00 AM (11:00) |
| 5:00 AM (05:00) | 12:00 PM (12:00) |
| 6:00 AM (06:00) | 1:00 PM (13:00) |
| 7:00 AM (07:00) | 2:00 PM (14:00) |
| 8:00 AM (08:00) | 3:00 PM (15:00) |
| 9:00 AM (09:00) | 4:00 PM (16:00) |
| 10:00 AM (10:00) | 5:00 PM (17:00) |
| 11:00 AM (11:00) | 6:00 PM (18:00) |
| 12:00 PM (12:00) | 7:00 PM (19:00) |
| 1:00 PM (13:00) | 8:00 PM (20:00) |
| 2:00 PM (14:00) | 9:00 PM (21:00) |
| 3:00 PM (15:00) | 10:00 PM (22:00) |
| 4:00 PM (16:00) | 11:00 PM (23:00) |
| 5:00 PM (17:00) | 12:00 AM (00:00)+1 day |
| 6:00 PM (18:00) | 1:00 AM (01:00)+1 day |
| 7:00 PM (19:00) | 2:00 AM (02:00)+1 day |
| 8:00 PM (20:00) | 3:00 AM (03:00)+1 day |
| 9:00 PM (21:00) | 4:00 AM (04:00)+1 day |
| 10:00 PM (22:00) | 5:00 AM (05:00)+1 day |
| 11:00 PM (23:00) | 6:00 AM (06:00)+1 day |
Best time to call London from Denver
For most work calls, compare the normal business day in Denver (MST) with the business day in London (GMT). MST commonly covers North America, while GMT is mainly associated with Europe, Africa.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:00 AM - 10:00 AM MST, which corresponds to 4:00 PM - 5:00 PM GMT. This window sits inside the typical MST workday (9:00 AM - 5:00 PM) and the GMT workday (9:00 AM - 5:00 PM).
- DST Safety: MST or GMT may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- London Stock Exchange: 08:00-16:30 local time in London.
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Frequently Asked Questions
What is the time difference between MST and GMT?
During standard time, Greenwich Mean Time is 7 hours ahead of Mountain Standard Time.
Does Arizona observe Daylight Saving Time?
Most of Arizona — including Phoenix, Tucson, and the state government — does not observe Daylight Saving Time, remaining on MST (UTC-7) year-round under a state law in effect since 1968. The significant exception is the Navajo Nation, which spans parts of northeastern Arizona, Utah, and New Mexico and does observe DST, creating one of the most complex intrastate time zone situations in the United States.
What is the difference between MST and MDT?
MST (Mountain Standard Time) is the winter offset at UTC-7:00, observed from the first Sunday in November through the second Sunday in March. MDT (Mountain Daylight Time) is the summer offset at UTC-6:00, applied when most Mountain Time regions advance their clocks by one hour during Daylight Saving Time.
What is the difference between GMT and BST?
GMT (Greenwich Mean Time) is the UK's standard winter offset at UTC+0, observed from the last Sunday in October through the last Sunday in March. BST (British Summer Time) is the daylight saving offset at UTC+1, applied each summer when clocks advance one hour.
Is GMT the same as UTC?
GMT and UTC share exactly the same numerical offset — both represent UTC+00:00 — but they are fundamentally different in nature. UTC is an atomic-clock-based international time standard used as the global reference, while GMT is a geographic time zone legally observed by specific countries including the United Kingdom and Ireland during winter months.