MDT to GMT Converter & Meeting Planner
Quick answer: 9:00 AM MDT = 3:00 PM GMT (fixed -06:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Mountain Daylight Time (MDT) and Greenwich Mean Time (GMT)? You need to account for the standard time difference. Greenwich Mean Time is normally 6 hours ahead of Mountain Daylight Time. Whether you are coordinating between teams in Denver and Salt Lake City 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 MDT = 6:00 AM GMT. The full 24-hour MDT to GMT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM MDT = 9:00 PM GMT.
| MDT Time | GMT Time |
|---|---|
| 12:00 AM (00:00) | 6:00 AM (06:00) |
| 1:00 AM (01:00) | 7:00 AM (07:00) |
| 2:00 AM (02:00) | 8:00 AM (08:00) |
| 3:00 AM (03:00) | 9:00 AM (09:00) |
| 4:00 AM (04:00) | 10:00 AM (10:00) |
| 5:00 AM (05:00) | 11:00 AM (11:00) |
| 6:00 AM (06:00) | 12:00 PM (12:00) |
| 7:00 AM (07:00) | 1:00 PM (13:00) |
| 8:00 AM (08:00) | 2:00 PM (14:00) |
| 9:00 AM (09:00) | 3:00 PM (15:00) |
| 10:00 AM (10:00) | 4:00 PM (16:00) |
| 11:00 AM (11:00) | 5:00 PM (17:00) |
| 12:00 PM (12:00) | 6:00 PM (18:00) |
| 1:00 PM (13:00) | 7:00 PM (19:00) |
| 2:00 PM (14:00) | 8:00 PM (20:00) |
| 3:00 PM (15:00) | 9:00 PM (21:00) |
| 4:00 PM (16:00) | 10:00 PM (22:00) |
| 5:00 PM (17:00) | 11:00 PM (23:00) |
| 6:00 PM (18:00) | 12:00 AM (00:00)+1 day |
| 7:00 PM (19:00) | 1:00 AM (01:00)+1 day |
| 8:00 PM (20:00) | 2:00 AM (02:00)+1 day |
| 9:00 PM (21:00) | 3:00 AM (03:00)+1 day |
| 10:00 PM (22:00) | 4:00 AM (04:00)+1 day |
| 11:00 PM (23:00) | 5:00 AM (05:00)+1 day |
Best time to call London from Denver
For most work calls, compare the normal business day in Denver (MDT) with the business day in London (GMT). MDT 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 MDT, which corresponds to 4:00 PM - 5:00 PM GMT. This window sits inside the typical MDT workday (9:00 AM - 5:00 PM) and the GMT workday (9:00 AM - 5:00 PM).
- DST Safety: MDT 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 MDT and GMT?
During standard time, Greenwich Mean Time is 6 hours ahead of Mountain Daylight Time.
When does MDT start and end?
MDT begins on the second Sunday in March at 02:00 local MST time, when clocks spring forward one hour from MST (UTC-7) to MDT (UTC-6). It ends on the first Sunday in November at 02:00 local MDT time, when clocks fall back to MST. In 2026, MDT runs from March 8 through November 1, covering the majority of the calendar year.
Is Arizona on MDT?
Most of Arizona — including Phoenix and Tucson — does not observe Daylight Saving Time and remains on MST (UTC-7) year-round under a state law in effect since 1968, meaning Arizona does not advance to MDT each March. The significant exception is the Navajo Nation, a sovereign territory spanning parts of northeastern Arizona, southeastern Utah, and northwestern New Mexico, which does observe DST and shifts to MDT on the standard federal schedule.
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.