JSpinner and date / time

Hello.
After strugeling through APIs and official tutorials I finally though I
understand the thing, but nooooo... I'm trying to make my spinner spin
from 00:00 to 59:59 (mm:ss) with seconds increasing by 1. Can anybody
tell me why stuff below dosen't work? I've run out of patience for
testing and reading over and over. Thank you.

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import java.util.*;
import javax.swing.*;

public class TFrame extends JFrame {
     public TFrame() {
         super("TEST");
         setDefaultCloseOperation(EXIT_ON_CLOSE);

         Calendar calendar = Calendar.getInstance();
         calendar.set(Calendar.SECOND, 0);
         calendar.set(Calendar.MINUTE, 0);
         Date startDate = calendar.getTime();
         calendar.add(Calendar.MINUTE, 60);
         Date maxDate = calendar.getTime();
         JSpinner spinner = new JSpinner(new SpinnerDateModel(startDate,
                                 startDate, maxDate, Calendar.SECOND));
         spinner.setEditor(new JSpinner.DateEditor(spinner, "mm:ss"));

         add(spinner);
         setBounds(0,0,200,100);
         setVisible(true);
     }

     public static void main(String[] args) {
         new TFrame();
     }

} // end of class
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....dosen't work, spiner is always at 00:00. :(

--
Kova