code: public static String getXNextWeek(String date, Integer x, Language language) {
  		NormalizationManager nm = NormalizationManager.getInstance(language, false);
  		String date_no_W = date.replace("W", "");
  		SimpleDateFormat formatter = new SimpleDateFormat("yyyy-w");
  		String newDate = "";
  		Calendar c = Calendar.getInstance();
  		try {
  			c.setTime(formatter.parse(date_no_W));
  			c.add(Calendar.WEEK_OF_YEAR, x);
  			c.getTime();
  			newDate = formatter.format(c.getTime());
  			newDate = newDate.substring(0,4)+"-W"+nm.getFromNormNumber(newDate.substring(5));
  		} catch (ParseException e) {
  			e.printStackTrace();
  		}
  		return newDate;
  	}
docs: get the x-next week of date
  @param date current date
  @param x amount of weeks to go forward
  @return new week