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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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