To connect to a port:
$ echo | openssl s_client -servername NAME -connect HOST:PORT 2>/dev/null | openssl x509 -noout -dates
To check a certificate
openssl x509 -enddate -noout -in file.pem
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To connect to a port:
$ echo | openssl s_client -servername NAME -connect HOST:PORT 2>/dev/null | openssl x509 -noout -dates
To check a certificate
openssl x509 -enddate -noout -in file.pem