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Check SSL Certificate Expiration Date via Command Line

If you wanna check SSL certificate expiration date for specific domain via command line, you can use openssl command.

Let’s check google.com:443 certificate expiration date using openssl.

$ openssl s_client -connect google.com:443 -servername google.com < /dev/null 2> /dev/null | openssl x509 -text | grep "After"
            Not After : Dec  6 17:09:00 2017 GMT

Dec 6 17:09:00 2017 GMT is expiration date.

Reference