what is world standard time?in one sentence
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UTC replaced GMT (Greenwich Mean Time) in 1972 as the time standard. UTC is a high precision atomic time standard, which measures time by the nanosecond. UTC has standard seconds as defined by the International Atomic Time.
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The local time within a time zone is defined by its offset (difference) from Coordinated Universal Time (UTC), the world's time standard. This offset is expressed as either UTC– or UTC+ and the number of hours.
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