Calendar 加减时间

public class TestTimewfs {
    public static void main(String[] args) {
        DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateStr = "2021-05-20 22:00:00";
        Date date = null;
        try {
            date = format1.parse(dateStr);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        Calendar c = Calendar.getInstance();
        //c.set(2021,05, 20,22,00,00);
        c.setTime(date);
        Date date2=c.getTime();
        System.out.println(format1.format(date2));
        c.add(Calendar.HOUR,18);
        Date date1=c.getTime();
        System.out.println(format1.format(date1));


    }
}

Calendar 加减时间

原文：https://www.cnblogs.com/6kuaifuji/p/14789081.html