Convert British Summer Time to Greenwich Mean Time instantly. Scroll the timeline to check any hour of the day.
British Summer TimeBST
10:09PMJul 31
Greenwich Mean TimeGMT
9:09PMJul 31
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How the BST to GMT time difference works
GMT is 1 hour behind BST. British Summer Time (BST) is the spring-to-autumn daylight time of the United Kingdom, fixed at one hour ahead of GMT.
Greenwich Mean Time (GMT) is the fixed UTC+0 reference time, used by the United Kingdom and Ireland in winter.
For example, 9:00 AM BST is 8:00 AM GMT.
Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
Time difference
1 hour
Daylight saving
Neither
BST offset
UTC+1
GMT offset
UTC+0
BST to GMT conversion chart
British Summer Time (BST)
Greenwich Mean Time (GMT)
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Best time to meet
A standard 9 to 5 workday overlaps from 10:00 AM to 5:00 PM BST (9:00 AM to 4:00 PM GMT). Schedule inside that window to catch both coasts during business hours.
GMT is 1 hour behind BST. So 9:00 AM BST is 8:00 AM GMT, and 5:00 PM BST is 4:00 PM GMT.
What time is it in GMT when it is 12:00 PM BST?
When it is 12:00 PM (noon) BST in British Summer Time, it is 11:00 AM GMT in Greenwich Mean Time.
How many hours difference is there between BST and GMT?
There is a 1 hour difference. Greenwich Mean Time (GMT) runs 1 hour behind British Summer Time (BST).
Do BST and GMT observe daylight saving time?
Neither British Summer Time nor Greenwich Mean Time shifts its clocks for daylight saving time, so the 1 hour difference between them is the same all year. BST is itself the daylight-saving period of the United Kingdom: clocks there run on BST from late March to late October and return to GMT in winter.
What is the best time to schedule a meeting between BST and GMT?
A standard 9-to-5 workday overlaps from 10:00 AM to 5:00 PM BST (9:00 AM to 4:00 PM GMT). Scheduling inside that window keeps the call during business hours in both British Summer Time and Greenwich Mean Time.
Which cities use BST and GMT?
British Summer Time (BST) covers cities such as London, Manchester, Birmingham, Glasgow, Liverpool, Edinburgh. Greenwich Mean Time (GMT) covers cities such as London, Dublin, Lisbon, Edinburgh, Manchester.
