Coordinated Universal Time 协调世界时
（重定向自Zulu Time）
![World map of current time zones](/Images/godic/202502/22/Standard_World_Time_Zones1828.png")
![Graph showing the difference DUT1 between UT1 and UTC (in seconds). Vertical segments correspond to leap seconds.](/Images/godic/202502/22/Leapsecond.ut1-utc.svg1828.png")
![Le Temps universel coordonné en Europe l’hiver.
Légende :
UTC
UTC+1
UTC+2
UTC+3
UTC+3:30
UTC+4
UTC+5](/Images/godic/202502/22/Europe_time_zones_map_fr1828.png")
![Le Temps universel coordonné au Canada.
Normale
Avancée
Nom du fuseau horaire
UTC−03:30
UTC−02:30
Terre-Neuve
UTC−04:00
UTC−03:00
Atlantique
UTC−04:00
Atlantique
UTC−05:00
UTC−04:00
Est
UTC−05:00
Est
UTC−06:00
UTC−05:00
Prairies
UTC−06:00
Prairies
UTC−07:00
UTC−06:00
Rocheuses
UTC−07:00
Rocheuses
UTC−08:00
UTC−07:00
Pacifique
Note : selon la Constitution canadienne, les provinces décident si elles adoptent l’heure avancée ou non ou quelle partie de leur territoire y est assujetti.](/Images/godic/202502/22/UTC_hue4map_CAN1828.png")
Coordinated Universal Time (French:Temps universel coordonné), abbreviated as UTC, is the primary time standard by which the world regulates clocks and time. It is, within about 1 second, mean solar time at 0° longitude; it does not observe daylight saving time. It is one of several closely related successors to Greenwich Mean Time (GMT). For most purposes, UTC is considered interchangeable with GMT, but GMT is no longer precisely defined by the scientific community.