Find Greater date

greaterdate.php

<?php
function greaterDate($start_date,$end_date)
{
  $start = strtotime($start_date);
  $end = strtotime($end_date);
  if ($start-$end > 0)
    return 1;
  else
   return 0;
}


$date1='2007-10-10';
$date1='2007-10-11';
if(greaterDate($date1,$date2))
   echo "First parameter is greater";
else
   echo "Second parameter is greater";