def _append_date(self, value, _file):  # pylint: disable=no-self-use
        """Call this function to write date contents.

        Keyword arguments:
            * value - dict, content to be dumped
            * _file - FileIO, output file

        """
        _text = value.strftime('%Y-%m-%dT%H:%M:%S.%fZ')
        _labs = ' "{text}"'.format(text=_text)
        _file.write(_labs)