That'd be incredibly expensive for more than a few dates though. So, if you have, say, more than 5 or 10 dates, then Use The Power Of The Schwartz:

my @sorted_dates = map $_->[0], sort { Date_Cmp($a->[1], $b->[1]) }
  map [$_, ParseDate($_)], @dates;
[download]

-- Randal L. Schwartz, Perl hacker