協調世界時,簡稱UTC,佢英文係Coordinated Universal Time,法文係Temps Universel Cordonné。中國大陸用ISO 8601:2000嗰國家標準《數據元和交換格式信息交換日期和時間表示法》(GB/T 7408-2005)叫佢“協調世界時”。臺灣用CNS 7648嗰《資料元及交換格式–資訊交換–日期及時間的表示法》叫佢“世界協調時間”。
協調世界時係搦原子時秒長為準,到時刻上最接近世界時嗰一隻時間比照系統。
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