protected function verifyDataFormat()
	{
		// TODO validate data and formats
		if(!XSDDateTime::validateXSDDateTime($this->headers[SONIC_HEADER__DATE]))
			throw new MalformedRequestHeaderException("Malformed response: Header " . SONIC_HEADER__DATE . " malformed: " . $this->headers[SONIC_HEADER__DATE]);
		if(!XSDDateTime::validateXSDDateTime($this->headers[SONIC_HEADER__DATE]))
			throw new MalformedRequestHeaderException("Malformed response: Header " . SONIC_HEADER__DATE . " malformed: " . $this->headers[SONIC_HEADER__DATE]);

		return true;
	}