GMT to UTC Time Converter
Convert Greenwich Mean Time to Coordinated Universal Time instantly.
Scroll the timeline to check any hour of the day.
Search any city, build a custom world clock, and plan across more time zones and options in the FlutterTime app. Free.
How the GMT to UTC time difference works
UTC is 1 hour behind GMT. Greenwich Mean Time (GMT) is the time zone of the United Kingdom and Ireland.
Coordinated Universal Time (UTC) is the global time standard the world sets its clocks by.
For example, 9:00 AM GMT is 8:00 AM UTC.
Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
GMT to UTC conversion chart
| Greenwich Mean Time (GMT) |
Coordinated Universal Time (UTC) |
| 12:00 AM |
11:00 PM -1 day |
| 1:00 AM |
12:00 AM |
| 2:00 AM |
1:00 AM |
| 3:00 AM |
2:00 AM |
| 4:00 AM |
3:00 AM |
| 5:00 AM |
4:00 AM |
| 6:00 AM |
5:00 AM |
| 7:00 AM |
6:00 AM |
| 8:00 AM |
7:00 AM |
| 9:00 AM |
8:00 AM |
| 10:00 AM |
9:00 AM |
| 11:00 AM |
10:00 AM |
| 12:00 PM |
11:00 AM |
| 1:00 PM |
12:00 PM |
| 2:00 PM |
1:00 PM |
| 3:00 PM |
2:00 PM |
| 4:00 PM |
3:00 PM |
| 5:00 PM |
4:00 PM |
| 6:00 PM |
5:00 PM |
| 7:00 PM |
6:00 PM |
| 8:00 PM |
7:00 PM |
| 9:00 PM |
8:00 PM |
| 10:00 PM |
9:00 PM |
| 11:00 PM |
10:00 PM |
Best time to meet
A standard 9 to 5 workday overlaps from 10:00 AM to 5:00 PM GMT (9:00 AM to 4:00 PM UTC). Schedule inside that window to catch both coasts during business hours.
Cities in each time zone
Greenwich Mean Time (GMT)
LondonDublinLisbonEdinburghManchester
Coordinated Universal Time (UTC)
ReykjavikAccraDakarAbidjanBamako
GMT to UTC questions
Is UTC ahead of or behind GMT?
UTC is 1 hour behind GMT. So 9:00 AM GMT is 8:00 AM UTC, and 5:00 PM GMT is 4:00 PM UTC.
What time is it in UTC when it is 12:00 PM GMT?
When it is 12:00 PM (noon) GMT in Greenwich Mean Time, it is 11:00 AM UTC in Coordinated Universal Time.
How many hours difference is there between GMT and UTC?
There is a 1 hour difference. Coordinated Universal Time (UTC) runs 1 hour behind Greenwich Mean Time (GMT).
Do GMT and UTC observe daylight saving time?
Greenwich Mean Time observes daylight saving time but Coordinated Universal Time does not, so the difference between them changes by an hour twice a year.
What is the best time to schedule a meeting between GMT and UTC?
A standard 9-to-5 workday overlaps from 10:00 AM to 5:00 PM GMT (9:00 AM to 4:00 PM UTC). Scheduling inside that window keeps the call during business hours in both Greenwich Mean Time and Coordinated Universal Time.
Which cities use GMT and UTC?
Greenwich Mean Time (GMT) covers cities such as London, Dublin, Lisbon, Edinburgh, Manchester. Coordinated Universal Time (UTC) covers cities such as Reykjavik, Accra, Dakar, Abidjan, Bamako.
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