Calendar 取上一年，上个月日期

        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.MONTH,-12);//上一年
        //cal.add(Calendar.MONTH,-1);//上个月 
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String day = sdf.format(cal.getTime());
        System.out.println(day);//2020-09-24

标签：上个月,上一年,SimpleDateFormat,add,cal,Calendar,sdf,day
来源： https://blog.csdn.net/weixin_43474476/article/details/120457370