Openssl view website ssl certificate expiry date

Cert expiry causes some of the most avoidable production incidents I’ve seen. This one-liner is worth putting into a monitoring script or cron job. The grep variant is useful when you only want the expiry date without the noise of the full cert details.

Watch Explanation on YouTube

how to extract website certificate expiry date using openssl command

Link URL : https://youtu.be/VQ52F2pOHjs

• using openssl dates flag

$ echo | openssl s_client -connect google.com:443 2>/dev/null | openssl x509 -noout -dates

• using grep

echo | openssl s_client -connect google.com:443 2>/dev/null | openssl x509 -noout -text | grep -A 1 "Not After :"