public interface LeapSecondEvent
This interface describes that during the last minute of a given calendar day an UTC-leapsecond was either introducted or left out.
Example: If the day is given as [1972-06-30] then this means a leapsecond in the last minute short before midnight of following day, namely at [1972-06-30T23:59:60Z].
Returns the date of leapsecond introduction.
Returns the leapsecond shift of this event only.
Note: Until the year 2014 there was only the shift of one
second extra so the return value of this method is always
But negative leapseconds with the shift
theoretically possible according to UTC definition.
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