สอบถามวิธีเขียนเงื่อนไข if(date < cuurentDate) ครับ

public static Date getTokenExpirationDate(String token)
    {
        JWT jwt = new JWT(token);
        Date expiresAt = jwt.getExpiresAt();

        return expiresAt;
    }

    public static void isTokenExpired(Context ctxt)
    {
        String token = Authentication.getSharedPreferences(ctxt).getString(Token, null);

        Date currentDate = new Date();
        Date expiryDate = getTokenExpirationDate(token);

        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        Log.i("JWT", currentDate.toString() + " == " + expiryDate);
        if(sdf.format(currentDate) > sdf.format(expiryDate)) <================== 
        {

        }

    }