时间天数加减

SimpleDateFormat formatter = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
java.util.Date currentTime = new java.util.Date();
String today = formatter.format(currentTime);
Date d = formatter.parse(today);
Calendar calendar = Calendar.getInstance();
calendar.setTime(d);
calendar.add(Calendar.DATE, 1);
System.out.println(“明天：” + formatter.format(calendar.getTime()));
//此时日期变为2015-12-01 ，所以下面的-2，
//理论上讲应该是2015-11-29
calendar.add(calendar.DATE, -2);
System.out.println(“前天：” + formatter.format(calendar.getTime()));