MDT to London
+7hMDT
MDTSOURCELondon
BSTGreen rows indicate typical business hours (9 AM - 5 PM)
MDT and BST on the World Map
The map below highlights the MDT (Mountain Daylight Time) and BST (Greenwich Mean Time) timezone regions across the globe.
MDT – Mountain Daylight Time
UTC-06:00Mountain Daylight Time (MDT) is the daylight saving offset in the Mountain Time Zone, 6 hours behind UTC.
- •MDT shares the same offset as CST (UTC-06:00).
- •Arizona does not switch to MDT, remaining on MST.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
Everything You Need to Know About MDT and London Time
MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. London runs on British Summer Time (BST) at UTC+01:00, also currently on daylight saving time. That puts MDT 7 hours ahead of London — a difference of +7h at the current offsets.
In practice, when it is 9:00 AM in MDT it is 4:00 PM in London. Midnight in MDT is 7:00 AM in London.London observes daylight saving time while MDT does not, so the gap narrows or widens by an hour part of the year.
MDT to London time conversion table
| MDT (MDT) | London (BST) | Day |
|---|---|---|
| 12:00 AM | 7:00 AM | same day |
| 6:00 AM | 1:00 PM | same day |
| 7:00 AM | 2:00 PM | same day |
| 8:00 AM | 3:00 PM | same day |
| 9:00 AM | 4:00 PM | same day |
| 12:00 PM | 7:00 PM | same day |
| 3:00 PM | 10:00 PM | same day |
| 5:00 PM | 12:00 AM | next day |
| 6:00 PM | 1:00 AM | next day |
| 9:00 PM | 4:00 AM | next day |
Why people convert MDT to London time
- Scheduling a call from MDT to London: a 10:00 AM start in MDT lands at 5:00 PM in London, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both MDT and London are inside the 9-to-5 working day between 9:00 AM and 10:00 AM MDT time (4:00 PM–5:00 PM BST). That is roughly 1 hours of usable overlap.
- Coordinating a MDT-based team with London contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM MDT" is unambiguous; "3 PM" across a +7h gap is not.
- Block 9:00 AM–10:00 AM MDT as the recurring meeting window if you work primarily from MDT and need London colleagues present.
- London: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
About MDT (Mountain Daylight Time)
Mountain Daylight Time (MDT) is observed during summer months in the Mountain Time Zone, except in Arizona which stays on MST year-round. MDT aligns with Central Standard Time (CST) at UTC-06:00.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
Best time to call between MDT and London
Both MDT and London sit inside the 9 AM – 5 PM working day between 9:00 AM–10:00 AM MDT, which is 4:00 PM–5:00 PM BST. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
MDT and London overlap for only 60 minutes (9:00 AM–10:00 AM MDT), so meetings have to be booked precisely.
MDT is 7 hours ahead of London (MDT UTC-06:00 → BST UTC+01:00). The shared working window is 9:00 AM–10:00 AM MDT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
MDT
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between MDT and London?
MDT (MDT, UTC-06:00) is 7 hours ahead of London (BST, UTC+01:00). The gap is currently +7h.
How do I convert MDT time to London time?
Add +7h to MDT local time. For example, 9:00 AM in MDT is 4:00 PM in London.
What time is it in London right now?
London uses BST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +7h offset from MDT.
What is the best time to call London from MDT?
Call between 9:00 AM and 10:00 AM MDT — that maps to 4:00 PM–5:00 PM BST and keeps both parties inside the working day.
Which is ahead, MDT or London?
MDT is 7 hours ahead of London. When it is 12:00 PM in MDT it is 7:00 PM in London.
Do MDT and London use different time zones?
MDT uses MDT at UTC-06:00, while London (UK) uses BST at UTC+01:00. The IANA identifiers are America/Denver and Europe/London.
Does daylight saving time affect the MDT–London difference?
Yes at the moment: London is on daylight saving time and MDT is not, so the +7h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share MDT's time zone?
MDT also covers Denver, Calgary, Edmonton, Salt Lake City, Boise.
Which countries use MDT, MDT's zone?
MDT is used in United States (Mountain), Canada (Alberta).
Is there a day difference between MDT and London?
Not normally. The +7h gap only pushes the date over for late-evening times.
What is the time difference between MDT and London?
London is +7h from MDT.
What timezone is MDT in?
MDT operates on its local timezone.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
Which countries use MDT (Mountain Daylight Time)?
MDT is used in United States (Mountain), Canada (Alberta).
Does MDT observe daylight saving time?
Yes, MDT switches to MST during summer months.
What are some interesting facts about MDT?
MDT shares the same offset as CST (UTC-06:00). Arizona does not switch to MDT, remaining on MST.
Which cities are in the GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
When is it midnight in MDT, what time is it in London?
When it is 12:00 AM (midnight) in MDT (MDT), it is +7h later in London (GMT).
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