Greenwich Mean Time (gmt) is used in United Kingdom. The IANA timezone identifier is Europe/London.

Mountain Daylight Time (mdt) is used in USA. The IANA timezone identifier is America/Denver.

GMT to MDT Time Converter

Greenwich Mean Time → Mountain Daylight Time

GMT = UTC+1MDT = UTC-6

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

MDT (Denver)

USA · -7h

02:00

New York

USA · -5h

04:00

Tokyo

Japan · +8h

17:00

Dubai

United Arab Emirates · +3h

12:00

Sydney

Australia · +9h

18:00

GMT (London) vs MDT (Denver) — time difference

GMT (London) is 7 hours ahead of MDT (Denver). When it's noon in GMT (London), it's 05:00 in MDT (Denver).

GMT (London) is in the Europe/London timezone. MDT (Denver) is in America/Denver. The difference is 7 hours.

Shared working hours

Both GMT (London) and MDT (Denver) are simultaneously in business hours for 1 hour per day (assuming standard 9:00–17:00 working hours).

00:0006:0012:0018:0024:00

GMT (London)

MDT (Denver)

Overlap (1h)

Recommended meeting windows

Both GMT (London) and MDT (Denver) are in standard hours simultaneously for 1h per day.

16:00 London / 09:00 Denver✓ Both working

Based on standard 09:00–17:00 working hours in each location's local time.

Public holidays this year

⚡ Upcoming holidays in both locations, confirm with your contact before booking.

GMT (London)6 holidays

Jul 13Battle of the Boyne

Aug 3Summer Bank Holiday

Aug 31Summer Bank Holiday

Nov 30Saint Andrew's Day

Dec 25Christmas Day

MDT (Denver)7 holidays

Jul 3Independence DaySOON

Sep 7Labour Day

Oct 12Columbus Day

Oct 12Indigenous Peoples' Day

Nov 11Veterans Day

GMT (London) and MDT (Denver) — practical scheduling

GMT (London) (United Kingdom) leads MDT (Denver) (USA) by 7 hours. Despite the gap, a 1-hour window of shared business hours each day keeps real-time collaboration practical for both sides.

💡 Practical scheduling guidelines

✅

16:00–17:00 in GMT (London) = 09:00–10:00 in MDT (Denver). Both sides are in standard business hours during this window.

DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.

Get the Extension — Free →

Use the time slider above to find the exact equivalent time for any moment in GMT (London). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.

GMT (London) ↔ MDT (Denver)

1h of business hours overlap daily (09:00–17:00)

GMT (London)

MDT (Denver)

00:00

17:00-1d

01:00

18:00-1d

02:00

19:00-1d

03:00

20:00-1d

04:00

21:00-1d

05:00

22:00-1d

06:00

23:00-1d

07:00

00:00

08:00

01:00

09:00Working

02:00off

10:00Working

03:00off

11:00Working

04:00off

12:00Working

05:00off

13:00Working

06:00off

14:00Working

07:00off

15:00Working

08:00off

16:00Working

09:00Working

17:00

10:00Working

18:00

11:00Working

19:00

12:00Working

20:00

13:00Working

21:00

14:00Working

22:00

15:00Working

23:00

16:00Working

Working hours: 09:00–17:00 local. Green = both working. Purple = one side only.

Frequently Asked Questions

What is the difference between gmt and mdt?

Greenwich Mean Time (gmt) is UTC+1 and Mountain Daylight Time (mdt) is UTC-6. The difference between them is 7 hours.

Where is gmt used?

Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.

Where is mdt used?

Mountain Daylight Time (mdt) is used in USA and surrounding regions. The IANA timezone identifier is America/Denver.

How do I convert gmt to mdt?

Use the interactive converter above. Drag the time slider to any gmt time and the mdt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.

Popular GMT conversions

GMT → New York GMT → Tokyo GMT → Dubai GMT → Sydney GMT → Paris GMT → Berlin GMT → Singapore GMT → Los Angeles GMT → Toronto GMT → Mumbai

Popular MDT conversions

London → MDT New York → MDT Tokyo → MDT Dubai → MDT Sydney → MDT Paris → MDT Berlin → MDT Singapore → MDT Los Angeles → MDT Toronto → MDT