I'm trying to verify 'certbot renew' functionality. With current status of certificate, if run 'certbot renew' I get below output. Anyway I can adjust current certificate validity so I can confirm 'certbot renew' working as expected. Based on the validation, I will add cron job to update automatically. I can understand 'certbot renew' automatically update the cert but I would like to see it in action.
letsencrypt]# certbot renew
Saving debug log to /var/log/letsencrypt/letsencrypt.log
No renewals were attempted.