java关于当前时间分别累加相应的年、月、日

SimpleDateFormat df= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

Calendar c = Calendar.getInstance();         

        //累加七天

        c.setTime(new Date());

        c.add(Calendar.DATE, 7);

        Date d = c.getTime();

        String day = df.format(d);       

        

        //累加三个月

        c.setTime(new Date());

        c.add(Calendar.MONTH, 3);

        Date m3 = c.getTime();

        String mon3 = df.format(m3);

       

        //累加一年

        c.setTime(new Date());

        c.add(Calendar.YEAR, 1);

        Date y = c.getTime();

        String year = df.format(y);

        System.out.println("过去一年："+year);

如果想看当前时间往前推时间将添加的数改为负数即可