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

Coordinated Universal Time (utc) is used in United Kingdom. The IANA timezone identifier is UTC.

GMT to UTC Time Converter

Greenwich Mean Time → Coordinated Universal Time

GMT = UTC+1UTC = UTC+0

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

UTC (London)

United Kingdom · UTC±0

09:00

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) ↔ UTC (London) — time offset

GMT (London) is 1 hour ahead of UTC (London). When GMT (London) clocks hit noon, UTC (London) reads 11:00.

GMT (London) observes Europe/London and UTC (London) observes Europe/London — a 1 hour gap between them.

Mutual working hours

Every working day, GMT (London) and UTC (London) are both in business hours for 7 hours simultaneously.

00:0006:0012:0018:0024:00

GMT (London)

UTC (London)

Overlap (7h)

Optimal meeting slots

GMT (London) and UTC (London) share 7 hours of business hours overlap daily. Showing the 3 most balanced slots — see the time table below for the full window.

10:00 London / 09:00 London✓ Both working

11:00 London / 10:00 London✓ Both working

12:00 London / 11:00 London✓ Both working

Assumes a standard 9 AM–5 PM workday in each location's local timezone.

Holiday calendar for both locations

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

UTC (London)

No upcoming public holidays this year.

Working across GMT (London) and UTC (London)

Coordinating between GMT (London) (United Kingdom) and UTC (London) (United Kingdom) means working around a 1-hour time difference. The 7-hour overlap window gives both teams a natural slot for real-time collaboration without anyone working outside normal hours.

💡 Best practice for cross-timezone meetings

✅

Schedule at 10:00–11:00 (GMT (London)) for a 09:00–10:00 slot in UTC (London) — the sweet spot where both teams are working.

✅

Schedule at 11:00–12:00 (GMT (London)) for a 10:00–11:00 slot in UTC (London) — the sweet spot where both teams are working.

✅

Schedule at 12:00–13:00 (GMT (London)) for a 11:00–12:00 slot in UTC (London) — the sweet spot where both teams are working.

Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.

Install ClockinSync Free →

Drag the slider at the top to convert any GMT (London) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.

GMT (London) ↔ UTC (London)

7h of business hours overlap daily (09:00–17:00)

GMT (London)

UTC (London)

00:00

23:00-1d

01:00

00:00

02:00

01:00

03:00

02:00

04:00

03:00

05:00

04:00

06:00

05:00

07:00

06:00

08:00

07:00

09:00Working

08:00off

10:00Working

09:00Working

11:00Working

10:00Working

12:00Working

11:00Working

13:00Working

12:00Working

14:00Working

13:00Working

15:00Working

14:00Working

16:00Working

15:00Working

17:00

16:00Working

18:00

17:00

19:00

18:00

20:00

19:00

21:00

20:00

22:00

21:00

23:00

22:00

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

Frequently Asked Questions

What is the difference between gmt and utc?

Greenwich Mean Time (gmt) is UTC+1 and Coordinated Universal Time (utc) is UTC+0. The difference between them is 1 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 utc used?

Coordinated Universal Time (utc) is used in United Kingdom and surrounding regions. The IANA timezone identifier is UTC.

How do I convert gmt to utc?

Use the interactive converter above. Drag the time slider to any gmt time and the utc 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 UTC conversions

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