try changing you code to use the Y-m-d h:i:s as the date format:
<?php echo ((isset($_POST["monitorGoLiveDate"]))?GetSQLValueString(date('Y-m-d h:i:s', strtotime($_POST["monitorGoLiveDate"])), 'date'):""); ?>
and
<?php echo ((isset($_POST["monitorEndDate"]))?GetSQLValueString(date('Y-m-d h:i:s', ($_POST["monitorEndDate"])), 'date'):""); ?>