/**

     * @param input

     *            <CURRENTMONTH><CURRENTMONTH+1>

     * @return Month "MM"

     */

    private String currentMonth(String input) {

        SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");

        Date now = new Date();

        String temp = dateFormat.format(now);

        String month = temp.split("/")[1];

        input = input.toUpperCase();

        if (input.length() == "<CURRENTMONTH>".length()) {

            return month;

        }

        else if (input.length() > "<CURRENTMONTH>".length()) {

            String math = input.substring("<CURRENTMONTH".length(),

                    "<CURRENTMONTH".length() + 1);

            String value = input.substring(input.indexOf(math) + 1,

                    input.length() - 1);

            int m = 0;

            if (math.equals("+")) {

                m = (Integer.parseInt(month) + Integer.parseInt(value)) % 12;

            } else if (math.equals("-")) {

                m = (Integer.parseInt(month) - Integer.parseInt(value)) % 12;

                m = Math.abs(m);

            } else {

                return "Operator error!";

            }

            if (m == 0) {

                m = 12;

            }

            if ((m + "").length() == 1) {

                month = "0" + m;

            } else {

                month = m + "";

            }

            return month;

        } else {

            return "The format of input value " + input + " is incorrect.";

        }

    }