My letsencrypt certificate will expire soon. I ran "certbot" to renew it for the next 3 months:
$ sudo certbot certonly --standalone -d $website --email admin@$website Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator standalone, Installer None Cert is due for renewal, auto-renewing... Renewing an existing certificate Performing the following challenges: tls-sni-01 challenge for my_website123.com Waiting for verification... Cleaning up challenges IMPORTANT NOTES: - Congratulations! Your certificate and chain have been saved at: /etc/letsencrypt/live/my_website123.com/fullchain.pem Your key file has been saved at: /etc/letsencrypt/live/my_website123.com/privkey.pem Your cert will expire on 2018-07-08. To obtain a new or tweaked version of this certificate in the future, simply run certbot again. To non-interactively renew *all* of your certificates, run "certbot renew" - If you like Certbot, please consider supporting our work by: Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate Donating to EFF: https://eff.org/donate-le
Why "2018-07-08"? I even ran certbot again - the result was the same.