GMT to BST Time Converter
Convert Greenwich Mean Time to British Summer Time instantly.
Scroll the timeline to check any hour of the day.
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How the GMT to BST time difference works
BST is 1 hour ahead of GMT. Greenwich Mean Time (GMT) is the fixed UTC+0 reference time, used by the United Kingdom and Ireland in winter.
British Summer Time (BST) is the spring-to-autumn daylight time of the United Kingdom, fixed at one hour ahead of GMT.
For example, 9:00 AM GMT is 10:00 AM BST.
Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
GMT to BST conversion chart
| Greenwich Mean Time (GMT) |
British Summer Time (BST) |
| 12:00 AM |
1:00 AM |
| 1:00 AM |
2:00 AM |
| 2:00 AM |
3:00 AM |
| 3:00 AM |
4:00 AM |
| 4:00 AM |
5:00 AM |
| 5:00 AM |
6:00 AM |
| 6:00 AM |
7:00 AM |
| 7:00 AM |
8:00 AM |
| 8:00 AM |
9:00 AM |
| 9:00 AM |
10:00 AM |
| 10:00 AM |
11:00 AM |
| 11:00 AM |
12:00 PM |
| 12:00 PM |
1:00 PM |
| 1:00 PM |
2:00 PM |
| 2:00 PM |
3:00 PM |
| 3:00 PM |
4:00 PM |
| 4:00 PM |
5:00 PM |
| 5:00 PM |
6:00 PM |
| 6:00 PM |
7:00 PM |
| 7:00 PM |
8:00 PM |
| 8:00 PM |
9:00 PM |
| 9:00 PM |
10:00 PM |
| 10:00 PM |
11:00 PM |
| 11:00 PM |
12:00 AM +1 day |
Best time to meet
A standard 9 to 5 workday overlaps from 9:00 AM to 4:00 PM GMT (10:00 AM to 5:00 PM BST). Schedule inside that window to catch both coasts during business hours.
Cities in each time zone
Greenwich Mean Time (GMT)
LondonDublinLisbonEdinburghManchester
British Summer Time (BST)
LondonManchesterBirminghamGlasgowLiverpoolEdinburgh
GMT to BST questions
Is BST ahead of or behind GMT?
BST is 1 hour ahead of GMT. So 9:00 AM GMT is 10:00 AM BST, and 5:00 PM GMT is 6:00 PM BST.
What time is it in BST when it is 12:00 PM GMT?
When it is 12:00 PM (noon) GMT in Greenwich Mean Time, it is 1:00 PM BST in British Summer Time.
How many hours difference is there between GMT and BST?
There is a 1 hour difference. British Summer Time (BST) runs 1 hour ahead of Greenwich Mean Time (GMT).
Do GMT and BST observe daylight saving time?
Neither Greenwich Mean Time nor British Summer Time shifts its clocks for daylight saving time, so the 1 hour difference between them is the same all year. The United Kingdom and Ireland use GMT only in winter; from late March to late October they switch to British Summer Time (BST), one hour ahead of GMT.
What is the best time to schedule a meeting between GMT and BST?
A standard 9-to-5 workday overlaps from 9:00 AM to 4:00 PM GMT (10:00 AM to 5:00 PM BST). Scheduling inside that window keeps the call during business hours in both Greenwich Mean Time and British Summer Time.
Which cities use GMT and BST?
Greenwich Mean Time (GMT) covers cities such as London, Dublin, Lisbon, Edinburgh, Manchester. British Summer Time (BST) covers cities such as London, Manchester, Birmingham, Glasgow, Liverpool, Edinburgh.
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