ZK: MVC ラベルの日付を和暦で表示する

DateUserを参考に日付を和暦(元号)で表示する。(Java6)

public class DateUserWAREKI implements TypeConverter {

    @Override
    public Object coerceToBean(Object arg0, Component arg1) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Object coerceToUi(Object arg0, Component arg1) {
        if (arg0 == null) {
            return null;
        }
        Locale locale = Locale("ja","JP","JP");
        SimpleDateFormat sdf = new SimpleDateFormat("GGGGyy年M月d日", locale);
        Date date = (Date) arg0;
        return sdf.format(date);
    }
}

<listcell label="@{employee.hireDate, converter='org.zkforge.converters.DateUserWAREKI'}"/>