Is it always in this (YYYYMMDD) format..? This will work..

#! perl

use strict;

my $s = "19600623";

my $yy = substr($s, 0, 4);
my $mm = substr($s, 4, 2);
my $dd = substr($s, 6, 2);

print "$yy-$mm-$dd\n";
[download]

Prints out 1960-06-23

Update: A little slow when I checked again..;)