1 public static void main(String[] args) throws CertificateException, FileNotFoundException { 2 CertificateFactory cf = CertificateFactory.getInstance("X.509"); 3 FileInputStream in = new FileInputStream("G://test.cer"); 4 X509Certificate cert = (X509Certificate) cf.generateCertificate(in); 5 Date effDate = cert.getNotBefore(); 6 Date expDate = cert.getNotAfter(); 7 System.out.println(effDate); 8 System.out.println(expDate); 9 }