London
UTC
Convert GMT to UTC
Greenwich Mean Time to Coordinated Universal Time — UTC is 1 hour behind London
Quick Facts
Time Difference
-1 hours
GMT Full Name
Greenwich Mean Time
UTC Full Name
Coordinated Universal Time
GMT to UTC Conversion Table
Related Conversions
About GMT and UTC Time Zones
GMT (Greenwich Mean Time) is UTC+0 and covers cities like London, Dublin, Lisbon. UTC (Coordinated Universal Time) is UTC+0 and covers cities like Universal reference time.
When it's 12:00 PM (noon) in London (GMT), it's 11:00 AM in UTC (UTC). The time difference between GMT and UTC is 1 hour — UTC is behind London.
With only a 0-hour difference, London and UTC share nearly a full business day overlap, making scheduling straightforward.
Use our world clock tool to compare London and UTC with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between GMT and UTC?
UTC (UTC) is 1 hour behind London (GMT). The offset is -1 hours.
Is UTC ahead or behind GMT?
UTC is 1 hour behind GMT. GMT is UTC+1 and UTC is UTC+0.
When it's 12:00 PM in London, what time is it in UTC?
When it's 12:00 PM (noon) in London (GMT), it's 11:00 AM in UTC (UTC).
When it's 5:00 PM in London, what time is it in UTC?
When it's 5:00 PM in London (GMT), it's 4:00 PM in UTC (UTC).