code: def CopyToDateTimeString(self):
      
      if (self._timestamp is None or self._timestamp < 0 or
          self._timestamp > self._UINT64_MAX):
        return None
  
      timestamp, remainder = divmod(self._timestamp, self._100NS_PER_SECOND)
      number_of_days, hours, minutes, seconds = self._GetTimeValues(timestamp)
  
      year, month, day_of_month = self._GetDateValuesWithEpoch(
          number_of_days, self._EPOCH)
  
      return '{0:04d}-{1:02d}-{2:02d} {3:02d}:{4:02d}:{5:02d}.{6:07d}'.format(
          year, month, day_of_month, hours, minutes, seconds, remainder)
docs: Copies the FILETIME timestamp to a date and time string.
  
      Returns:
        str: date and time value formatted as: "YYYY-MM-DD hh:mm:ss.#######" or
            None if the timestamp is missing or invalid.