ARTICLE
Leap second
Second by which a month is extended at the end of quarter in
UTC reference time. This offsets the
effect of the slower rotation of the earth with respect to TAI (Temps
Atomique International). A leap second day has 86401 seconds and the
leap second is represented by 23:59:60. The standard
POSIX .1:2001 does not support leap seconds and each day has
86400 seconds. In times based on the POSIX standard, any leap
seconds are rounded to valid times.
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