Despite being seen as the same, GMT (Greenwich Mean Time) and UTC (Co-ordinated Universal Time) can actually differ by up to 0.9 seconds because of different ways of calculating GMT.
Neither the English term 'Co-ordinated Universal Time' nor the French term 'Temps Universel Coordinné' result in the acronym UTC. This is because UTC is based on the "workaday mean solar time scale, UT-1, which is based on the somewhat irregular rotation of the Earth", so really it's 'Universal Time - Co-ordinated'.
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