code: public String getWeekdayOfMonth(int number, int weekday, int month, int year) {
  		return getWeekdayRelativeTo(String.format("%04d-%02d-01", year, month), weekday, number, true);
  	}
docs: Get the date of a the first, second, third etc. weekday in a month
  
  @author Hans-Peter Pfeiffer
  @param number
  @param weekday
  @param month
  @param year
  @return date