gistfile1.php

<?php
/*
 * Validates a custom Datetime
 * @param mixed check 
 * @param string 
 * @return boolean
 */
    public function customDatetime($check, $format)
    {
        foreach ($check as $field=>$value)
        {
           if (DateTime::createFromFormat($format, $value) !== false)
               return true;
        }
        return false;
    }