如何使用包含日期和时间的字符串设置DateField值？

String dateTime = \"29/05/2012 12:11 PM\";
long initialDateTime = System.currentTimeMillis();
SimpleDateFormat SDF_DateTime = new SimpleDateFormat(\"dd/MM/yyyy hh:mm aa\");
DateField DF_DateTime = new DateField(\"Time: \", initialDateTime , SDF_DateTime, Field.FIELD_LEFT | DrawStyle.LEFT | Field.FOCUSABLE);
DF_DateTime.setTimeZone(TimeZone.getDefault());
DF_DateTime.setDate(stringToDate(dateTime));
add(DF_DateTime);

public Date stringToDate(String s) 
{
    Calendar c = Calendar.getInstance(TimeZone.getDefault());
    c.set(Calendar.DAY_OF_MONTH, Integer.parseInt(s.substring(0, 2)));
    c.set(Calendar.MONTH, Integer.parseInt(s.substring(3, 5)) - 1);
    c.set(Calendar.YEAR, Integer.parseInt(s.substring(6, 10)));
    c.set(Calendar.HOUR, Integer.parseInt(s.substring(11, 13)));
    c.set(Calendar.MINUTE, Integer.parseInt(s.substring(14, 16)));
    c.set(Calendar.SECOND, 0);
    c.set(Calendar.AM_PM, s.substring(17, 19).toLowerCase().equals(\"am\") ? Calendar.AM : Calendar.PM);
    return c.getTime();
}