Greenwich Mean Time
Greenwich Mean Time (GMT) Local time at Greenwich, London, situated on the prime meridian (0° longitude) that passes through the Old Royal Observatory. It has been used as the basis for calculating standard time in various parts of the world since 1884.
Greenwich Mean Time
Green·wich Mean Time (abbr.: GMT) (also Green·wich time) the mean solar time at the Greenwich meridian, adopted as the standard time in a zone that includes the British Isles.
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Greenwich mean time
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Greenwich mean time