Since your dates appear to be fixed-width, and are arranged year-month-day, there's no reason why you can't use the basic sort, as mentioned above:
my @list = ('2005-12-01', '2005-11-02', '2005-12-07');
@list = sort @list;
print join "\n", @list;
If you want them from most recent to least recent, just reverse:
@list = reverse sort @list;
Things get a bit more difficult if your dates are arranged in a different order, but it's still fairly easy to do:
use strict;
use warnings;
my @sort = ('05-11-2006', '01-01-2005', '04-12-2005', '22-03-2005');
@sort =
map { join '-', reverse split /-/ }
sort
map { join '-', reverse split /-/ }
@sort;
print join "\n", @sort;