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/**
 * Format string to Unix time
 * @param $strDate string
 * @return int|bool timestamp or false
 */
  protected function formatDate($strDate)
  {
      if (!$strDate) {
          return false;
      }
      
      $timestamp = "";
      
      if (($timestamp = strtotime($strDate)) === false) {
          return false;
      } 
      
      return $timestamp;
  }