This is where I post snippets of information about Information Technology. It is mostly for my own reference but I hope that others will find it useful and comments are welcome.
$ openssl s_client -showcerts -servername example.com -connect example.com:443 </dev/null | openssl x509 -noout -dates -in -
...
notBefore=Feb 22 18:00:59 2024 GMT
notAfter=Feb 21 18:00:59 2026 GMT
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