flamboyant1:
UTC (Universal Temps Coordonne [translation : Coordinated universal time]) is exactly the same as GMT (Greenwich Mean Time). It is the time used for many worldwide aviation activities. Aviation professionals get used to doing the translation from UTC to the various local times in their head.
Unfortunately when the French got control of some aviation committee a while ago they decided they could not stand the GMT reference to a London suburb, or even it being in English. So the name got changed, although the basis is identical. A classic piece of xenophobia.