Apple, Google, Mozilla to reject certificates that expire more than 13 months (or 398 days) from their creation date. The lifespan of SSL/TLS certificates has shrunk significantly over the last decade. Apple recommends that certificates be issued with a maximum validity of 397 days. Google and Mozilla have followed suit to enforce similar 398-day limits. The development is a good time to implement certificate automation using tools such as Let’s Encrypt and EFF’s CertBot to set up, issue, renew, and replace SSL certificates.
Source: https://thehackernews.com/2020/09/ssl-tls-certificate-validity-398.html