The leap seconds are not assigned on a regular basis. While leap years arrive predictably, leap seconds don't. The only way for a computer to know about leap seconds is to be connected to something similar to an RFC-867 time server NIST Internet Time Service.
Well, that's not the only way. While leap seconds aren't assigned on a regular basis, they are announced way in advance, and leap seconds in the past aren't erased. A module dealing with leap seconds could just use a plain text file to store the leap seconds. A cron job to check the validity of the file run four times a year will be enough.
Perl --((8:>*

In reply to Re^2: Leap Second by Perl Mouse
in thread Leap Second by esskar

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