A better post would have been then:

$dated = '03/30/2007';
if ($dated =~ m/^[0-3][0-9]\/[0-1][0-9]\/[1-2][0-9][0-9][0-9]$/)
{
}
else
{
#User entered an invaild date.
$passfail = 0;
$errmsg = 'Unable to use date format. Please use "MM/DD/YYYY" or MM-DD
+-YYYY for the Date Delivered Field';
$errtitle = 'Validation Error';
$seconds = 7;
}
[download]

This fails, because your second segment does only allow for 00 to 19 and never for 30, which seems sensible if you want to validate dates in the format DD/MM/YYYY as you say. Your error message doesn't match that, as there you claim to match MM/DD/YYYY...