date, Calendar

    Date date = new Date();
        System.out.println(date.toString());
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");    
        System.out.println(format.format(date));
        
        
        String input = "1818-11-11 23:12:34";
        
        SimpleDateFormat f1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
//            System.out.println(f1.parse(input));
            Date date2 = f1.parse(input);
            
            System.out.println(date2);
        } catch (ParseException e) {
            
            e.printStackTrace();
        }
        
        
        Calendar calendar  = Calendar.getInstance();
        calendar.set(2019, 9, 12);
        
        System.out.println(calendar.get(Calendar.YEAR));
        System.out.println(calendar.get(Calendar.MONDAY));
        System.out.println(calendar.get(Calendar.DATE));
        System.out.println(calendar.get(Calendar.DAY_OF_MONTH));
        System.out.println(calendar.get(Calendar.DAY_OF_WEEK));
        
        calendar.add(Calendar.DATE, 30);
        
        System.out.println(calendar.get(Calendar.YEAR));
        System.out.println(calendar.get(Calendar.MONDAY));
        System.out.println(calendar.get(Calendar.DATE));
        System.out.println(calendar.get(Calendar.DAY_OF_MONTH));
        System.out.println(calendar.get(Calendar.DAY_OF_WEEK));