Check if Certificate Expired

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

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#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkCert cert;
    BOOL success;
    BOOL isExpired;

    cert = CkCert_Create();

    //  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 = CkCert_LoadByCommonName(cert,"Chilkat Software, Inc.");
    if (success == FALSE) {
        printf("Failed to find certificate!\n");
    }
    else {

        //  Display the certificate's distinguished name:
        printf("%s\n",CkCert_subjectDN(cert));

        isExpired = CkCert_getExpired(cert);
        if (isExpired == TRUE) {
            printf("Certificate is expired.\n");
        }
        else {
            printf("Certificate is NOT expired.\n");
        }

    }

    //  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 = CkCert_LoadFromFile(cert,"myCert.cer");
    if (success == FALSE) {
        printf("Failed to load certificate!\n");
    }
    else {

        //  Display the certificate's distinguished name:
        printf("%s\n",CkCert_subjectDN(cert));

        isExpired = CkCert_getExpired(cert);
        if (isExpired == TRUE) {
            printf("Certificate is expired.\n");
        }
        else {
            printf("Certificate is NOT expired.\n");
        }

    }

    //  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.


    CkCert_Dispose(cert);

    }