Why can I not extend java.util.Date?

Working with Date is a nightmare.. so beforehand: Any advice regarding work with time and date in GWT are very welcome!

Why do my requests silently fail if I do this:

public class AwesomeDate extends java.util.Date {

  public final static int MONDAY = 1; 

  public final static int TUESDAY = 2; 

  public final static int WEDNESDAY = 3; 

  public final static int THURSDAY = 4; 

  public final static int FRIDAY = 5; 

  public final static int SATURDAY = 6; 

  public final static int SUNDAY = 7;

  @Override

  public int getDay() { 

    switch(super.getDay()) { 

    case 1:

      return MONDAY;

    case 2:

      return TUESDAY;

    case 3:

      return WEDNESDAY;

    case 4:

      return THURSDAY;

    case 5:

      return FRIDAY;

    case 6:

    return SATURDAY;

      case 0:

      return SUNDAY;

    } 

    throw new RuntimeException();

  }

}

and then

AwesomeDate fromDate = ..
AwesomeDate toDate = ..

myObjectEnter.request(fromDate, toDate, onSuccess, onFailure);

where

MyObject#request(Date from, Date to, OnSuccess<ResultDTO> success, OnFailure failure);

Because if I do that my request does simply nothing. It's not even getting sent off.. I have an object that takes care for parallel requests

 for (ParallelizableRequest<?> parallelizableRequest : this.childRequests) {
   parallelizableRequest.request();
 }

but that request that is using AwesomeDate is simply not being executed. In the JavaScript debugger I see that the list childRequests contains two elements but that's all I can tell.

Any ideas?

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