World map of current time zones
Coordinated Universal Time (abbreviated to UTC ) is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at
0° longitude , and does not observe daylight saving time . For most purposes, UTC is considered interchangeable with Greenwich Mean Time (GMT), but GMT is no longer precisely defined by the scientific community.
The first Coordinated Universal Time was informally adopted on 1 January 1960, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent), was not adopted until 1967.
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