London to Denver
-7hLondon
BSTSOURCEDenver
MDTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and MDT on the World Map
The map below highlights the BST (Greenwich Mean Time) and MDT (Mountain Standard Time) timezone regions across the globe.
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.
MST – Mountain Standard Time
UTC-07:00Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.
- •Arizona does not observe daylight saving time, staying on MST year-round.
- •The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
- •Denver, the 'Mile High City', is the largest city fully in MST.
- •MST covers 6 US states entirely and parts of several others.
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.
About Denver
WikipediaDenver operates on Mountain Time (MST/MDT), 2 hours behind New York. As a tech and aerospace hub, Denver bridges West Coast and Central US business hours.
Denver International Airport is the largest airport in North America by land area.
London vs Denver: Offsets, DST and Best Call Times
London runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. Denver runs on Mountain Daylight Time (MDT) at UTC-06:00, also currently on daylight saving time. That puts London 7 hours behind Denver — a difference of -7h at the current offsets.
In practice, when it is 9:00 AM in London it is 2:00 AM in Denver. Midnight in London is 5:00 PM in Denver. Because both zones shift for daylight saving, the gap between them only changes during the few weeks each year when their transition dates differ.
London to Denver time conversion table
| London (BST) | Denver (MDT) | Day |
|---|---|---|
| 12:00 AM | 5:00 PM | previous day |
| 6:00 AM | 11:00 PM | previous day |
| 7:00 AM | 12:00 AM | same day |
| 8:00 AM | 1:00 AM | same day |
| 9:00 AM | 2:00 AM | same day |
| 12:00 PM | 5:00 AM | same day |
| 3:00 PM | 8:00 AM | same day |
| 5:00 PM | 10:00 AM | same day |
| 6:00 PM | 11:00 AM | same day |
| 9:00 PM | 2:00 PM | same day |
Why people convert London to Denver time
- Scheduling a call from London to Denver: a 10:00 AM start in London lands at 3:00 AM in Denver, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both London and Denver are inside the 9-to-5 working day between 4:00 PM and 5:00 PM BST time (9:00 AM–10:00 AM MDT). That is roughly 1 hours of usable overlap.
- Coordinating a London-based team with Denver 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 BST" is unambiguous; "3 PM" across a -7h gap is not.
- Block 4:00 PM–5:00 PM BST as the recurring meeting window if you work primarily from London and need Denver colleagues present.
- London: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the -7h gap.
- Denver: Clocks fall back on Sun, Nov 1, 2026. Any meeting series spanning that date will shift by an hour in local time.
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.
About MST (Mountain Standard Time)
Mountain Standard Time (MST) covers the Rocky Mountain region of the United States and Canada. Arizona is notable for not observing daylight saving time, staying on MST year-round (except the Navajo Nation). The time zone includes major cities like Denver, Phoenix, Calgary, and Salt Lake City. During summer, most areas switch to Mountain Daylight Time (MDT, UTC-06:00).
Best time to call between London and Denver
Both London and Denver sit inside the 9 AM – 5 PM working day between 4:00 PM–5:00 PM BST, which is 9:00 AM–10:00 AM MDT. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
London and Denver overlap for only 60 minutes (4:00 PM–5:00 PM BST), so meetings have to be booked precisely.
London is 7 hours behind Denver (BST UTC+01:00 → MDT UTC-06:00). The shared working window is 4:00 PM–5:00 PM BST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Denver
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 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 London and Denver?
London (BST, UTC+01:00) is 7 hours behind Denver (MDT, UTC-06:00). The gap is currently -7h.
How do I convert London time to Denver time?
Add -7h to London local time. For example, 9:00 AM in London is 2:00 AM in Denver.
What time is it in Denver right now?
Denver uses MDT at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -7h offset from London.
What is the best time to call Denver from London?
Call between 4:00 PM and 5:00 PM BST — that maps to 9:00 AM–10:00 AM MDT and keeps both parties inside the working day.
Which is behind, London or Denver?
London is 7 hours behind Denver. When it is 12:00 PM in London it is 5:00 AM in Denver.
Do London and Denver use different time zones?
London (UK) uses BST at UTC+01:00, while Denver (USA) uses MDT at UTC-06:00. The IANA identifiers are Europe/London and America/Denver.
Does daylight saving time affect the London–Denver difference?
Both zones observe DST, so the difference stays at -7h for most of the year and only changes during the weeks when their transition dates do not line up.
Which other cities share London's time zone?
BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use BST, London's zone?
BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between London and Denver?
Not normally. The -7h gap only pushes the date over the previous day.
What is the time difference between London and Denver?
Denver is -7h from London.
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 timezone is Denver in?
Denver operates on Mountain Time (MST/MDT), 2 hours behind New York. As a tech and aerospace hub, Denver bridges West Coast and Central US business hours.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
What are the business hours in Denver?
Standard business hours in Denver are 8:00 AM - 5:00 PM MST.
What is the best time to schedule a call between London and Denver?
The best overlap for a call is when both cities are in business hours. London works 9:00 AM - 5:00 PM GMT and Denver works 8:00 AM - 5:00 PM MST (-7h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in London and Denver?
London uses GBP (£) while Denver uses USD ($). Check current exchange rates when planning travel or business between these cities.
How do London and Denver compare in size?
London has a population of approximately 8.8 million (metro: 14.8 million), while Denver has approximately 715,000 (metro: 2.9 million).
What are the major landmarks in London and Denver?
London is known for Big Ben, Tower Bridge, Buckingham Palace. Denver is famous for Red Rocks Amphitheatre, Denver Art Museum, Union Station.
Do London and Denver have stock exchanges?
Yes. London has the LSE (London Stock Exchange) and Denver has the N/A (Uses NYSE/NASDAQ). The -7h time difference affects trading hour overlaps between these exchanges.
Which countries use GMT (Greenwich Mean Time)?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.
Does GMT observe daylight saving time?
Yes, GMT switches to BST during summer months.
What are some interesting facts about GMT?
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.
Which cities are in the MST timezone?
Major cities in the MST timezone include Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson.
What is the UTC offset for MST?
Mountain Standard Time (MST) is at UTC-07:00. During daylight saving time, it shifts to MDT.
What should I know about the MST timezone?
Arizona does not observe daylight saving time, staying on MST year-round. The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
When is it midnight in London, what time is it in Denver?
When it is 12:00 AM (midnight) in London (GMT), it is -7h later in Denver (MST).
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