From:	Eugene van der Pijll	Date:	Wed Oct  1 11:14:53 2008
Subject:	Re: I'd tell you how long it'll take for my hair to fall out but I'm struggling with duration!

Monty, James T schreef:
> >Leap seconds. DateTime doesn't really do them correctly
> 
> Please explain this. I've always thought DateTime *does* handle leap
> seconds correctly.

DateTime handles them correctly for dates between the introduction of
leap seconds (1972) and the first yet-to-be-announced future leap
second. The only exception is DT->epoch(), which ignores leap seconds to
be consistent with the POSIX standard.

Between 1961 and 1972, UTC used a second of variable length, and
frequent fractional leap seconds. These are not implemented in DateTime.
Before 1961, UTC didn't exist; it is unclear what DateTime objects
before 1961 actually represent.

Future dates, after the next unannounced leap second, are also
incorrect; for the current version of DateTime, this could be as recent
as July 1, 2009, I believe. That cannot be helped (although you could
argue that DateTime should automatically update its table of leap
seconds every six months).

Eugene