Unix time, or POSIX time, is a system for describing points in
time: it is the number of seconds elapsed since
midnight UTC of
January 1 1970, not counting
leap seconds. It is widely used not only on
Unix-like operating systems but also in many other computing systems. It is neither a linear representation of time nor a true representation of
UTC (though it is frequently mistaken for both) as the times it represents are UTC but it has no way of representing UTC leap seconds (e.g. 1998-12-31 23:59:60).
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