java求n小时候的时间

Java代码

1. Calendar c = Calendar.getInstance();
2. Date date = new Date();
3. c.setTime(date);
4. // c.add(Calendar.DAY_OF_MONTH, -2);
5. c.add(Calendar.HOUR_OF_DAY, -48);
6. SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
7. String searchDate = sdf.format(c.getTime());
8. System.out.println(searchDate);