SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar cal = Calendar.getInstance();
        //最近三天
        cal.add(Calendar.DAY_OF_YEAR, -3);
        //最近一周
        cal.add(Calendar.WEEK_OF_YEAR, -1);
        //最近两周
        cal.add(Calendar.WEEK_OF_YEAR, -2);
        //最近一个月
        cal.add(Calendar.MONTH, -1);
        //最近两个月
        cal.add(Calendar.MONTH, -2);
        Date d = cal.getTime();
        System.out.println(sdf.format(d));

------解决方案--------------------
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Java code

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar cal = Calendar.getInstance();
        //最近三天
        cal.add(Calendar.DAY_OF_YEAR, -3);
        //最近一周……