FULL PRODUCT VERSION :
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b06)
Java HotSpot(TM) Client VM (build 1.6.0_02-b06, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows XP ver 5.1 SP 2

A DESCRIPTION OF THE PROBLEM :
When specifying
"dd.MM.yyyy kk:mm:ss:SS"
as the Format for the DateEditor used by a JSpinner with SpinnerDateModel, you can't spin the 'kk'-Part of the String.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Define a JSpinner with SpinnerDateModel.
Set the Editor up with a Format-Specification that includes a "Hour in day (1-24)" SimpleDateFormat (kk).
Run the Application and try to spin the hour-Value.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
All Values can be spun by shifting the Carret at the right position and clicking one of the spin Buttons. The right Value is highlighted.
ACTUAL -
The Hours-Value specified as "Hour in day (1-24)" kk can not be spun and is not highlighted.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.Calendar;
import java.util.Date;

import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.SpinnerDateModel;

public class Test extends JPanel
{
private static JSpinner dateSpinner;
private static final String FORMAT = "dd.MM.yyyy kk:mm:ss:SS";

public static void main(String[] args) {

dateSpinner = new JSpinner(new SpinnerDateModel(new Date(System.currentTimeMillis()), null, null, Calendar.YEAR));
dateSpinner.setEditor(new JSpinner.DateEditor(dateSpinner, Test.FORMAT));

Test f = new Test();
f.add(dateSpinner);
JOptionPane.showConfirmDialog(null, f);

}
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Use 'HH' instead of 'kk' which is 'Hour in day (0-23)'.