Java SE (Java Platform, Standard Edition)

Hello,

in the following code the second spinner cannot be spun.
But removing the editor makes it spinnable again. (Click on the hours first.)
Any idea why - respectively how the format can be maintained?

import java.awt.*;
import java.util.*;
import javax.swing.*;
 
public class TimeSpinner extends JFrame {
  public TimeSpinner() {
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    setLayout(new GridLayout(2,2, 0,5));
    JSpinner spin24 = new JSpinner(new SpinnerDateModel());
    spin24.setEditor(new JSpinner.DateEditor(spin24, "HH:mm:ss"));

    Calendar start= Calendar.getInstance();
    start.set(Calendar.HOUR_OF_DAY, 8);
    start.set(Calendar.MINUTE, 0);
    Calendar middle= Calendar.getInstance();
    middle.set(Calendar.HOUR_OF_DAY, 12);
    middle.set(Calendar.MINUTE, 30);
    Calendar end= Calendar.getInstance();
    end.set(Calendar.HOUR_OF_DAY, 17);
    end.set(Calendar.MINUTE, 0);
System.out.println(start.getTime());
System.out.println(middle.getTime());
System.out.println(end.getTime());
    SpinnerDateModel spinModel= new SpinnerDateModel(middle.getTime(),
		start.getTime(), end.getTime(), Calendar.MINUTE);
    JSpinner boundedSpinner = new JSpinner(spinModel);
    boundedSpinner.setEditor(new JSpinner.DateEditor(boundedSpinner,"HH:mm"));

    add(new JLabel("24 hours spinner"));
    add(spin24);
    add(new JLabel("8 to 17 hours spinner"));
    add(boundedSpinner);
    pack();
    setVisible(true);
  }


  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
	new TimeSpinner();
      }
    });
  }
}