($paymonth < 11) ? $paymonth++ : ($paymonth=0, $payyear++);
$expire_time = timelocal(0,0,0,$payday,$paymonth,$payyear);
$expire_time--;
($paymonth < 11) ? $paymonth++ : ($paymonth=0, $payyear++);
$expire_time = timelocal(0,0,0,$payday,$paymonth,$payyear);
$expire_time--;