code: def _GetTimeValue(self, name):
      
      timestamp = getattr(self._tsk_file.info.meta, name, None)
  
      if self._file_system_type in self._TSK_HAS_NANO_FS_TYPES:
        name_fragment = '{0:s}_nano'.format(name)
        fraction_of_second = getattr(
            self._tsk_file.info.meta, name_fragment, None)
      else:
        fraction_of_second = None
  
      return TSKTime(timestamp=timestamp, fraction_of_second=fraction_of_second)
docs: Retrieves a date and time value.
  
      Args:
        name (str): name of the date and time value, for example "atime" or
            "mtime".
  
      Returns:
        dfdatetime.DateTimeValues: date and time value or None if not available.