def CopyToDateTimeString(self):
if self._number_of_seconds is None:<EOL><INDENT>return None<EOL><DEDENT>return '<STR_LIT>'.format(<EOL>self.year, self.month, self.day_of_month, self.hours, self.minutes,<EOL>self.seconds, self.deciseconds)<EOL>
Copies the RFC2579 date-time to a date and time string.

        Returns:
          str: date and time value formatted as: "YYYY-MM-DD hh:mm:ss.#" or
              None if the number of seconds is missing.