Get the expiry date for an online TLS/SSL certificate

certificate-expiry

#!/usr/bin/env bash

hostname=$1

online-certificate $hostname | \
  openssl x509 -inform pem -noout -enddate

online-certificate

#!/usr/bin/env bash

hostname=$1

echo | \
openssl s_client \
-connect $hostname:443 \
-servername $hostname \
2>/dev/null