The full form of GMT is Greenwich Mean Time.

GMT was the standard time zone of the world until recently. It is calculated from the place named Greenwich in United Kingdom.

The time zones of other places were calculated with respect to GMT.

However, recently, the standard time zone has been replaced by Coordinated Universal Time (UTC). The UTC runs parallel to GMT and differs by only a few seconds.

GMT stands for greenwich merdian time
it is the mean solar time at the Royal Observatory in Greenwich, London.
it is used as a civil international time

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