DefaultCalendarItem colorItem = new DefaultCalendarItem.Builder()
                .withTitle("blue")
                .withContent("yellow")
                .withBegin(day1.withHour(2))
                .withEnd(day1.withHour(4))
                .withHeaderColor("blue")
                .withContentColor("yellow")
                .withSclass("colored")
                .withZoneId(defaultZoneId)
                .build();
        model.add(colorItem);