<script type="text/javascript">
    function subDays(value) {
      var today = new Date();
      var dd = today.getDate() - value;
      var mm = today.getMonth() + 1;
      var yyyy = today.getFullYear();

      var day = dd + '/' + mm + '/' + yyyy;
      return day;
    }
    //25 / 3 / 2016
    console.log(subDays(2));
  </script>