inputCalendar with CalendarConverter loses value data

When I set a Converter for java.util.Calendar to inputCalendar, the value will not be rendered.

<t:inputCalendar id="calendar_1"
value="#

{exampleInputBean.calendar}

"
renderAsPopup="true">
<f:converter converterId="de.orgaplan.faces.CalendarConverter" />
</t:inputCalendar>

Because the HtmlCalendarRenderer throws an IllegalArgumentException and set the value to null.
My Converter is not an Instance of DateConverter.

Date value;

try
{
// value = RendererUtils.getDateValue(inputCalendar);
Converter converter = getConverter(inputCalendar);
if (converter instanceof DateConverter)

{ value = ((DateConverter) converter).getAsDate(facesContext, component); }

else

{ value = RendererUtils.getDateValue(inputCalendar); }

}
catch (IllegalArgumentException illegalArgumentException)

{ value = null; }