of one mean solar day is slightly longer than 86,400
seconds (a UTC day). The purpose of a leap second is to compensate for
this drift, by scheduling days with 86401 or 86399 international standard
seconds.
Because the Earth's rotation speed varies in response to
natural events, UTC leap seconds are irregularly spaced and unpredictable.
The last leap second occured at 23:59:59 UTC on 31 December 2008. Leap
seconds occur based on UTC time, and therefore are timezone independent
and occur around the world at the same moment, regardless of local
time.
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