Coordinated Universal Time (UTC) daidaitaccen tsarin kiyaye lokaci ne da ake amfani da shi azaman tushen kiyaye lokaci na duniya. Shi ne ma'aunin lokaci na farko wanda duniya ke tsara agogo da lokaci. UTC ya dogara ne akan agogon atomic, kuma ana daidaita shi lokaci-lokaci don yin la'akari da rashin daidaituwa a cikin juyawar duniya. Ma'anar ƙamus na Coordinated Universal Time shine "ma'auni na farko na lokaci wanda duniya ke tsara agogo da lokaci, bisa ga agogon atomic da kuma daidaitawa lokaci-lokaci don lissafin rashin daidaituwa a cikin juyawar duniya."