Coordinated Universal Time
Primary time standard globally used to regulate clocks and time
Coordinated Universal Time
Coordinated Universal Time (UTC) is the primary time standard used globally to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communication, navigation, scientific research, and commerce. UTC has been embraced by most countries and is the effective successor to Greenwich Mean Time (GMT) in everyday usage and common applications. In specialised domains such as scientific research, navigation, and timekeeping, additional standards such as UT1 and International Atomic Time (TAI) are used alongside UTC. UTC is based on TAI (International Atomic Time, abbreviated from its French name, temps atomique international), which is a weighted average of hundreds of atomic clocks worldwide. UTC is currently within about one second of mean solar time at 0° longitude, the currently used prime meridian, and is not adjusted for daylight saving time. The coordination of time and frequency transmissions...
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