I don't think GregorianCalendar.setChangeDate works

[John Hines]

I see the expected 11 day gap for the default ChangeDate but when I change it to the English change date, I don't see the expected 12 day gap. Any advice?

import java.text.DateFormat;
import java.util.*;
public class SetGregorianChangeDate {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
        DateFormat df = DateFormat.getDateInstance();
        df.setTimeZone(TimeZone.getTimeZone("GMT"));
 
        GregorianCalendar  gc = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
        System.out.println("Get default change date in GMT:" 
          + df.format(gc.getGregorianChange().getTime()));        
        System.out.println("Get day before default change date in GMT (Expect 11 day gap Oct 4, 1582):" 
          + df.format(gc.getGregorianChange().getTime() - 24*60*60*1000));
 
        gc = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
        gc.set(1752, 9 - 1 , 14, 0, 0, 0);
        gc.setGregorianChange(gc.getTime()) ;
 
        System.out.println("Get new change date in GMT:" 
          + df.format(gc.getGregorianChange()));        
        System.out.println("Get new day before default change date in GMT (Expect 12 day gap Sep 2, 1752) :" 
          + df.format(gc.getGregorianChange().getTime() - 24*60*60*1000));
    }
}

Get default change date in GMT:Oct 15, 1582
Get day before default change date in GMT (Expect 11 day gap Oct 4, 1582):Oct 4, 1582
Get new change date in GMT:Sep 14, 1752
Get new day before default change date in GMT (Expect 12 day gap Sep 2, 1752) :Sep 13, 1752