public static String getDisplayName(int offsetDays) {
        Calendar calendar = Calendar.getInstance();
        if (offsetDays != 0)
            calendar.add(Calendar.DATE, offsetDays);
        Date date = calendar.getTime();
        String m_d = M_D.get().format(date);// e.g：5.2
        switch (offsetDays) {
            case -2:
                return "前天(" + m_d + ")";
            case -1:
                return "昨天(" + m_d + ")";
            case 0:
                return "今天(" + m_d + ")";
            case 1:
                return "明天(" + m_d + ")";
            case 2:
                return "后天(" + m_d + ")";
            default:
                return m_d;
        }
    }