Java vypis datumu

Zdravim, potreboval bych vysvetlit, proc kod#1 vypise 31.10.2013 19:59:59 a kod#2 vypise 01.11.2013 03:59:59. Cekal bych vysledky obou kodu ekvivalentni, diky.

kod#1

public static void main(String[] args) {
        Calendar to = Calendar.getInstance();
        to.set(Calendar.DAY_OF_MONTH, 31);
        to.set(Calendar.MONTH, 9);
        to.set(Calendar.YEAR, 2013);
        to.set(Calendar.HOUR_OF_DAY, 23);
        to.set(Calendar.MINUTE, 59);
        to.set(Calendar.SECOND, 59);
        to.setTimeZone(TimeZone.getTimeZone("Asia/Aqtau"));
//        System.out.println(TimeZone.getDefault().getID());
//        System.out.println(Arrays.toString(TimeZone.getAvailableIDs()));
        SimpleDateFormat dateformat = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
//        dateformat.setTimeZone(TimeZone.getTimeZone("Asia/Aqtau"));
        System.out.println(dateformat.format(to.getTime()));
    }

kod#2

public static void main(String[] args) {
        Calendar to = Calendar.getInstance();
        to.set(Calendar.DAY_OF_MONTH, 31);
        to.set(Calendar.MONTH, 9);
        to.set(Calendar.YEAR, 2013);
        to.set(Calendar.HOUR_OF_DAY, 23);
        to.set(Calendar.MINUTE, 59);
        to.set(Calendar.SECOND, 59);
//        to.setTimeZone(TimeZone.getTimeZone("Asia/Aqtau"));
//        System.out.println(TimeZone.getDefault().getID());
//        System.out.println(Arrays.toString(TimeZone.getAvailableIDs()));
        SimpleDateFormat dateformat = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
        dateformat.setTimeZone(TimeZone.getTimeZone("Asia/Aqtau"));
        System.out.println(dateformat.format(to.getTime()));
    }