code: public static SimpleFormatter<PlainDate> ofDateStyle(
          DisplayMode style,
          Locale locale
      ) {
  
          DateFormat df = DateFormat.getDateInstance(style.getStyleValue(), locale);
          String pattern = getFormatPattern(df);
          return SimpleFormatter.ofDatePattern(pattern, locale);
  
      }
docs: /*[deutsch]
  <p>Konstruiert einen Formatierer f&uuml;r reine Datumsobjekte. </p>
  
  @param   style       format style
  @param   locale      format locale
  @return  new {@code SimpleFormatter}-instance
  @throws  IllegalStateException if no localized format pattern can be retrieved
  @since   5.0