def __get_filedate(self):
        """
        Parses (extracts) date of SAR data, from the SAR output file itself.
            :return: ISO-style (YYYY-MM-DD) date from SAR file
        """

        if os.access(self.__filename, os.R_OK):

            # Read first line of the file
            try:
                sar_file = open(self.__filename, "r")

            except OSError:
                ### DEBUG
                traceback.print_exc()
                return False

            except:
                ### DEBUG
                traceback.print_exc()
                return False

            firstline = sar_file.readline()
            info = firstline.split()
            sar_file.close()

            try:
                self.__file_date = info[3]

            except KeyError:
                self.__file_date = ''
                return False

            except:
                ### DEBUG
                traceback.print_exc()
                return False

            return True

        return False