Greenwich clock with standard measurements
Clocks at Leeds City Station; the left hand one being at British Summer Time and the right hand one being at Greenwich Mean Time.
Clock in Kumasi, Ghana, set to GMT.

During British Summer Time (BST), civil time in the United Kingdom is advanced one hour forward of Greenwich Mean Time (GMT), in effect changing the time zone from UTC±00:00 to UTC+01:00, so that mornings have one hour less daylight, and evenings one hour more.

- British Summer Time

During the experiment of 1968 to 1971, when the British Isles did not revert to Greenwich Mean Time during the winter, the all-year British Summer Time was called British Standard Time (BST).

- Greenwich Mean Time
Greenwich clock with standard measurements

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