def CopyToDateTimeString(self):
if self._number_of_seconds is None:<EOL><INDENT>return None<EOL><DEDENT>number_of_days, hours, minutes, seconds = self._GetTimeValues(<EOL>self._number_of_seconds)<EOL>year, month, day_of_month = self._GetDateValuesWithEpoch(<EOL>number_of_days, self._EPOCH)<EOL>return '<STR_LIT>'.format(<EOL>year, month, day_of_month, hours, minutes, seconds)<EOL>
Copies the FAT 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 number of seconds is missing.