public static String getLastYmd(String ymd) {
		try {
			//Date check
			SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
			sdf.setLenient(false);
			sdf.parse(ymd);

			//Get year / month
			int y = Integer.parseInt(ymd.substring(0, 4));
			int m = Integer.parseInt(ymd.substring(4, 6));

			//Get the last date of the acquired date
			Calendar cal = Calendar.getInstance();
			cal.set(Calendar.YEAR, y);
			cal.set(Calendar.MONTH, m - 1);
			cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DATE));

			//Convert to YYYYMMDD format and return
			return sdf.format(cal.getTime());

		} catch (Exception ex) {
			//Returns null when an exception occurs
			return null;
		}
	}

	public static String addYear(String fromYear, int year) {

		//Generate SimpleDateFormat object for format conversion
		DateFormat df = new SimpleDateFormat("yyyyMMdd");

		//Create a Calendar object that holds the current date and time
		Calendar cal = Calendar.getInstance();
		try {
			cal.setTime(df.parse(fromYear));
		} catch (ParseException e) {
			//TODO auto-generated catch block
			e.printStackTrace();
		}

		//Add years
		cal.add(Calendar.YEAR, year);

		return getLastYmd(df.format(cal.getTime()));
	}

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