How to use the memacs.lib.orgformat.OrgFormat.date function in memacs

orgdate = OrgFormat.strdate(datestamp)
            orgdate_time_tupel = OrgFormat.datetupeliso8601(datestamp)

            if not self._args.skip_filetime_extraction:

                if os.path.exists(link):
                    file_datetime = time.localtime(os.path.getmtime(link))
                    # check if the file - time information matches year,month,day,
                    # then update time
                    if file_datetime.tm_year == orgdate_time_tupel.tm_year and \
                       file_datetime.tm_mon == orgdate_time_tupel.tm_mon and \
                       file_datetime.tm_mday == orgdate_time_tupel.tm_mday:

                        logging.debug("found a time in file.setting %s-->%s",
                                      orgdate, OrgFormat.date(file_datetime, True))
                        orgdate = OrgFormat.date(file_datetime, True)
                else:
                    logging.debug("item [%s] not found and thus could not determine mtime" % link)

        return orgdate

"""
        handles a file (except ending with a tilde)
        """
        # don't handle emacs tmp files (file~)
        if file[-1:] == '~':
            return

        link = os.path.join(rootdir, file)
        logging.debug(link)

        if self._args.force_filedate_extraction:
            file_datetime = time.localtime(os.path.getmtime(link))

            if self._args.skip_filetime_extraction:
                logging.debug('force_filedate_extraction and skip_filetime_extraction: using date')
                orgdate = OrgFormat.date(file_datetime)
            else:
                logging.debug('force_filedate_extraction and not skip_filetime_extraction: using datetime')
                orgdate = OrgFormat.datetime(file_datetime)

            self.__write_file(file, link, orgdate)

        elif DATESTAMP_REGEX.match(file):
            logging.debug('DATESTAMP_REGEX matches; trying __parse_filename_iso_timestamp() ...')
            try:
                # we put this in a try block because:
                # if a timestamp is false i.e. 2011-14-19 or false time
                # we can handle those not easy with REGEX, therefore we have
                # an Exception TimestampParseException, which is thrown,
                # when strptime (parse from string to time tupel) fails
                orgdate = self.__parse_filename_iso_timestamp(file, link)
                self.__write_file(file, link, orgdate)

datestamp = DATESTAMP_REGEX.match(file).group()
            orgdate = OrgFormat.strdate(datestamp)
            orgdate_time_tupel = OrgFormat.datetupeliso8601(datestamp)

            if not self._args.skip_filetime_extraction:

                if os.path.exists(link):
                    file_datetime = time.localtime(os.path.getmtime(link))
                    # check if the file - time information matches year,month,day,
                    # then update time
                    if file_datetime.tm_year == orgdate_time_tupel.tm_year and \
                       file_datetime.tm_mon == orgdate_time_tupel.tm_mon and \
                       file_datetime.tm_mday == orgdate_time_tupel.tm_mday:

                        logging.debug("found a time in file.setting %s-->%s",
                                      orgdate, OrgFormat.date(file_datetime, True))
                        orgdate = OrgFormat.date(file_datetime, True)
                else:
                    logging.debug("item [%s] not found and thus could not determine mtime" % link)

        return orgdate

def datetimerange(begin, end):
        """
        returns a date range string in org format

        @param begin,end: has to be a time.struct_time
        """
        assert isinstance(begin, time.struct_time)
        assert isinstance(end, time.struct_time)
        return "%s--%s" % (OrgFormat.date(begin, True),
                           OrgFormat.date(end, True))