Why doesn't certbot auto-renew the certificate?

Question

Digital certificates

Hello. Installed certbot certificate. I checked the update sudo certbot renew --dry-run- it works.
I wrote this in the crown 15 3 * * * /usr/bin/certbot renew --quiet
. run this command every day at 15:30. Right?
Auto-update does not occur.
Is there anything additional that needs to be done? What to write in the crown? How to automate certbot renew?
On Ubuntu server 16.04

Answer 1

A Let's Encrypt certificate can be renewed if it expires in less than 30 days.

Answer 2

Try like this:

15 3 * * 1 /usr/bin/certbot renew >> /var/log/le-renew.log
20 3 * * 1 /etc/init.d/nginx reload

Answer 3

I will add.
> I.e. run this command every day at 15:30. Right?
No, that means at 03:15. Use crontab.guru