private GregorianCalendar createDate(String dateString) {
		String yearString = dateString.substring(0, 3);
		String monthString = dateString.substring(4, 5);
		String dayString = dateString.substring(6, 7);
		int year = Integer.parseInt(yearString);
		int month = Integer.parseInt(monthString);
		int day = Integer.parseInt(dayString);
		
		return new GregorianCalendar(year, month, day);		
	}