Why does my java time comparison fail?

I have the following method to convert String to date with millisecond granularity

public Date convertTime(String time) {

    SimpleDateFormat parser = new SimpleDateFormat("HH:mm:ss.S");
    try {
        return parser.parse(time);
    }
    catch (Exception ex) {
        ex.printStackTrace();
        return null;
    }


}

    Date d1 = lib.convertTime("10:30:53.39");
    Date d2 = lib.convertTime("10:30:53.40");
    System.out.println(d1.after(d2));

returns false as expected

However the following

    Date d1 = lib.convertTime("10:30:53.39");
    Date d2 = lib.convertTime("10:30:53.4");
    System.out.println(d1.after(d2));

Which I thought would have been the same returns true. What am I doing wrong?