(.NET Core C#) Get Certificate Valid To/From Dates

Demonstrates how to get the certificate "valid from" and "valid to" dates.

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Chilkat.Cert cert = new Chilkat.Cert();

bool success = cert.LoadFromFile("qa_data/certs/testCert.cer");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

// Get the certificate valid-from date/time
Chilkat.CkDateTime ckdt = cert.GetValidFromDt();
// Get the local timestamp string.
Debug.WriteLine("Valid from: " + ckdt.GetAsTimestamp(true));
// Valid from: 2017-03-17T19:00:00-05:00

// Now get the date/time as another object where we can get the individual numeric date parts.
Chilkat.DtObj dt = ckdt.GetDtObj(true);
Debug.WriteLine(Convert.ToString(dt.Day) + "/" + Convert.ToString(dt.Month) + "/" + Convert.ToString(dt.Year) + "  " + Convert.ToString(dt.Hour)
     + ":" + Convert.ToString(dt.Minute));

// Get the certificate valid-to date/time
ckdt = cert.GetValidToDt();
Debug.WriteLine("Valid to: " + ckdt.GetAsTimestamp(true));
// Valid to: 2020-03-18T18:59:59-05:00
dt = ckdt.GetDtObj(true);
Debug.WriteLine(Convert.ToString(dt.Day) + "/" + Convert.ToString(dt.Month) + "/" + Convert.ToString(dt.Year) + "  " + Convert.ToString(dt.Hour)
     + ":" + Convert.ToString(dt.Minute));