Time zone converter
GMT to UTC
Convert London Time — GMT/BST to Coordinated Universal Time — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in London, it's 8:00 AM in UTC. UTC is 1 hour behind London. Use the converter above to turn any GMT time into UTC, or scan the hour-by-hour table below for the full day.
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London Time — GMT/BST ·
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Coordinated Universal Time ·
Convert a specific timein London → — in UTC
GMT to UTC at a glance
9:00 AM GMT
8:00 AM
UTC · UTC
12:00 PM GMT
11:00 AM
UTC · UTC
5:00 PM GMT
4:00 PM
UTC · UTC
Planning a meeting between London and UTC
Planning a call between London and UTC? The best overlap during a standard 9-to-5 workday runs 10:00 AM–5:00 PM GMT (9:00 AM–4:00 PM UTC). Aim for that window to reach both sides during business hours.
Hour-by-hour: London to UTC
A full day mapped from GMT to UTC.
Frequently asked
Is UTC ahead of or behind London?
UTC is 1 hour behind London.
What is 12:00 PM GMT in UTC?
12:00 PM in London is 11:00 AM in UTC.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so GMT and UTC automatically reflect the correct daylight-saving offset for the current date.