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من این کد رو استفاده کردم، جواب داد:

    /**
     * return format: yyyy/MM/dd hh:mm
     * 
     */
    public static String getCurrentDate_MiladiWithTime() {

        Calendar cal = Calendar.getInstance();
        int Day = cal.get(Calendar.DAY_OF_MONTH);
        int Month = cal.get(Calendar.MONTH) + 1;
        int Year = cal.get(Calendar.YEAR);

        Time now = new Time(Time.getCurrentTimezone());
        now.setToNow();

        String today = Year + "/" + Month + "/" + Day + " " + now.format("%k:%M");
        return today;

    }


    /**
     * form of input data:yyyy/MM/dd HH:mm;
     * 
     */
     public static String calculate_new(String targetDate) {
        Log.i("LOG", targetDate);

        String nowDate = getCurrentDate_MiladiWithTime();

        //HH converts hour in 24 hours format (0-23), day calculation
        SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd HH:mm");

        Date d1 = null;
        Date d2 = null;

        String returnValue = "";

        try {
            d1 = format.parse(targetDate);
            d2 = format.parse(nowDate);

            //in milliseconds
            long diff = (d2.getTime() - d1.getTime()) / 1000;

            int minute = 60;
            int hour = minute * 60;
            int day = hour * 24;
            int month = day * 30;
            int year = day * 365;

            
            int diffYears = (int) Math.floor(diff / year);
            diff -= diffYears * year;
            int diffMonthes = (int) Math.floor(diff / month);
            diff -= diffMonthes * month;
            int diffDays = (int) Math.floor(diff / day);
            diff -= diffDays * day;
            int diffHours = (int) Math.floor(diff / hour);
            diff -= diffHours * hour;
            int diffMinutes = (int) Math.floor(diff / minute);
             

            /*
             //if you don't need all item simultaneously and want all values complete:
            
            int diffYears = (int) Math.floor(diff / year);
            int diffMonthes = (int) Math.floor(diff / month);
            int diffDays = (int) Math.floor(diff / day);
            int diffHours = (int) Math.floor(diff / hour);
            int diffMinutes = (int) Math.floor(diff / minute);
             */

            Log.i("LOG", diffYears + " years, ");
            Log.i("LOG", diffMonthes + " monthes, ");
            Log.i("LOG", diffDays + " days, ");
            Log.i("LOG", diffHours + " hours, ");
            Log.i("LOG", diffMinutes + " minutes, ");
            Log.i("LOG", diff + " diff, ");

            if (diffYears != 0) {
                returnValue = diffYears + " " + "سال";

            } else if (diffMonthes != 0) {
                returnValue = diffMonthes + " " + "ماه";

            } else if (diffDays != 0) {
                returnValue = diffDays + " " + "روز";

            } else if (diffHours != 0) {
                returnValue = diffHours + " " + "ساعت";

            } else if (diffMinutes != 0) {
                returnValue = diffMinutes + " " + "دقیقه";

            } else {
                returnValue = "لحظه ای";

            }

        }
        catch (Exception e) {
            e.printStackTrace();
        }

        return returnValue + " قبل";

    }