/** * Set the Return Date Format used by functions that return a date/time (Excel, PHP Serialized Numeric or PHP Object) * * @access public * @category Function Configuration * @param string $returnDateType Return Date Format * Permitted values are: * PHPExcel_Calculation_Functions::RETURNDATE_PHP_NUMERIC 'P' * PHPExcel_Calculation_Functions::RETURNDATE_PHP_OBJECT 'O' * PHPExcel_Calculation_Functions::RETURNDATE_EXCEL 'E' * @return boolean Success or failure */ public static function setReturnDateType($returnDateType) { if ($returnDateType == self::RETURNDATE_PHP_NUMERIC || $returnDateType == self::RETURNDATE_PHP_OBJECT || $returnDateType == self::RETURNDATE_EXCEL) { self::$ReturnDateType = $returnDateType; return True; } return False; }