title: Deducting 5 hours 30 minutes from the selected date time
body: <p>I am trying to deduct 5 hours and 30 mins from the selected datetime but it is not working </p>
  
  <p>my php code</p>
  
  <pre><code> $ambulanceDate = date('Y-m-d H:i:s', ($_POST['ambuStartDate'] . " " . $_POST['ambuStartTime']));
                  $date1 = str_replace('-', '/', $ambulanceDate);
                  $ambulanceUpdatedDate = date('m-d-Y',strtotime($date1 . "-5 hours 30 minutes"));
                  $ambulanceUpdatedDate = new DateTime($ambulanceUpdatedDate);
  </code></pre>