timtsj

    public boolean isValidIIN(String iin) {
        if (TextUtils.isEmpty(iin)) return false;

        String date = iin.substring(0, 6);
        String gender = iin.substring(6, 7);
        return iin.matches("\\d{12}") && isValidBirthday(date) && gender.matches("[1-6]") && isValidControl(iin);
    }
    
    private boolean isValidBirthday(String date) {
        if (TextUtils.isEmpty(date) || !date.matches("\\d{2}[01]\\d[0-3]\\d")) return false;