Time - Leap Second

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1 - About

As the Earth rotates the length of the day varies and therefore a leap-second may be added or removed depending on the Earth's rotational changes.

A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time, or UT1.

See also: Leap year, a year containing one extra day

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3 - Duration may then become negative

The important effect of leap second is that it may you got negative duration

4 - Documentation / Reference