Check if Certificate Expired

How to check to see if a digital certificate is expired.

Download Chilkat Java Library

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkCert cert = new CkCert();
    boolean isExpired;

    //  The LoadByCommonName method searches the registry-based
    //  Windows Current User Certificate Store and Local Machine Certificate
    //  Store for a certificate whose common name (CN) matches
    //  the argument:
    boolean success;
    success = cert.LoadByCommonName("Chilkat Software, Inc.");
    if (success == false) {
        System.out.println("Failed to find certificate!");
    }
    else {

        //  Display the certificate's distinguished name:
        System.out.println(cert.subjectDN());

        isExpired = cert.get_Expired();
        if (isExpired == true) {
            System.out.println("Certificate is expired.");
        }
        else {
            System.out.println("Certificate is NOT expired.");
        }

    }

    //  Alternatively, load a Certificate from a .cer file.
    //  (Certs may also be loaded from other types of files, such as PEM, DER, PFX, etc.)
    success = cert.LoadFromFile("myCert.cer");
    if (success == false) {
        System.out.println("Failed to load certificate!");
    }
    else {

        //  Display the certificate's distinguished name:
        System.out.println(cert.subjectDN());

        isExpired = cert.get_Expired();
        if (isExpired == true) {
            System.out.println("Certificate is expired.");
        }
        else {
            System.out.println("Certificate is NOT expired.");
        }

    }

    //  The Chilkat Certificate, Certificate Store, Private Key,
    //  Public Key, and Key Container classes / objects are freeware.

    //  They are used by and included with the Chilkat Email,
    //  Crypt, S/MIME, and other commercial Chilkat components.

  }
}