Time scales and civil time

Epoch

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Also: time reference, zero point

An epoch is the reference moment from which a system counts time. The number of seconds since the epoch is a compact, unambiguous representation of time.

Well-known examples: the Unix epoch (1 January 1970, 00:00:00 UTC), the NTP epoch (1 January 1900) and the GPS epoch (6 January 1980).

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