Why am I getting back CDT timezone instead of CST

[Scott Hiett]

The output from the following code:
passing 9/28/2002 5:00 PM CST
getTheDate = 09/23/2002 10:00 AM CDT

    private static final String formatStr = "MM/dd/yyyy hh:mm aa zzz";
//    private static final String tmZoneStr = "GMT-6:00";
    private static final String tmZoneStr = "CST";
    public static void main(String args[])
    {
        String testDate = "9/28/2002 5:00 PM CST";
        System.out.println("passing " + testDate);
        System.out.println("getTheDate = " + getTheDate(testDate));
    }
    public static String getTheDate(String val)
    {
        String retval = null;
        SimpleDateFormat retFormat = new SimpleDateFormat(formatStr);
        retFormat.setTimeZone(TimeZone.getTimeZone(tmZoneStr));
        GregorianCalendar gc = new GregorianCalendar(TimeZone.getTimeZone(tmZoneStr));
        
        try
        {
            gc.setTime( retFormat.parse(val));
        }
        catch(ParseException pe)
        {
            System.out.println("pe = " + pe.getMessage());
        }
        gc.add(Calendar.DAY_OF_MONTH, -5);
        gc.add(Calendar.HOUR, -8);
        return retFormat.format(gc.getTime());
    }

[Cindy Glass]

I expect it has something to do with the fact that it is trying to convert "China Standard Time" to "Central Standard Time" which is still on "Central Daylight Time" on 9-23-02.
Could be why the use of CST et al. is deprecated.