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Greenwich Mean Time

The Prime Meridian at Greenwich, London is the reference for every time zone in the world.

What is Greenwich Mean Time (GMT)?

United Kingdom is now on GMT

11:01:10 AM 01/20/2022GMT +00:00

GMT Time Carousel

What is the time difference?

View current time now in every one-hour difference ahead or behind GMT

The time difference or offset between a standard time zone and GMT is measured in full hours.


Greenwich Mean Time, abbreviated as GMT, is nowadays a time zone designation rather than a time standard. Its succesor, since 1972, has been UTC (Coordinated Universal Time). There is never more than one second difference between GMT and UTC.

In the UTC standard, there is a commitment to keep within 0.9 seconds of GMT, so that every few years a leap second is applied to UTC.

In the age of the internet, these small clock calibrations are conveniently distributed via NTP.

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