JAVA日期加减运算

1.用java.util.Calender来实现

Calendarcalendar = Calendar.getInstance();
calendar.setTime( new Date());
System.out.println(calendar.get(Calendar.DAY_OF_MONTH)); // 今天的日期
calendar.set(Calendar.DAY_OF_MONTH,calendar.get(Calendar.DAY_OF_MONTH) + 1 ); // 让日期加1
System.out.println(calendar.get(Calendar.DATE)); // 加1之后的日期Top

2.用java.text.SimpleDateFormat和java.util.Date来实现

Dated = new Date();
SimpleDateFormatdf = new SimpleDateFormat( " yyyy-MM-dd " );
System.out.println( " 今天的日期： " + df.format(d));
System.out.println( " 两天前的日期： " + df.format( new Date(d.getTime() - 2 * 24 * 60 * 60 * 1000 )));
System.out.println( " 三天后的日期： " + df.format( new Date(d.getTime() + 3 * 24 * 60 * 60 * 1000 )));