Check if Certificate Expired

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

Downloads for Windows/Linux and Install Instructions

require 'rubygems'
require 'chilkat'

cert = Chilkat::CkCert.new()

#  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:

success = cert.LoadByCommonName("Chilkat Software, Inc.")
if (success == false)
    print "Failed to find certificate!" + "\n"
else

    #  Display the certificate's distinguished name:
    print cert.subjectDN() + "\n";

    isExpired = cert.get_Expired()
    if (isExpired == true)
        print "Certificate is expired." + "\n";
    else
        print "Certificate is NOT expired." + "\n";
    end

end

#  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)
    print "Failed to load certificate!" + "\n"
else

    #  Display the certificate's distinguished name:
    print cert.subjectDN() + "\n";

    isExpired = cert.get_Expired()
    if (isExpired == true)
        print "Certificate is expired." + "\n";
    else
        print "Certificate is NOT expired." + "\n";
    end

end

#  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.