check_ssl_cert | shell script ( that can be used as a Nagios/Icinga plugin | TLS library

I created a simple Python program to get the expiry date of SSL cert, from reference on the Internet. It works correctly for cert that is still not expired. But for cert that already expired, an error was raised during the socket handshake due to the cert expiry.

How do I get the expired cert info to extract the expiry date because the connection is refused. Is there a way to force the socket connection to establish even though the cert might be expired?

Code: