What has Apple done
Apple has decided that they will no longer support TLS/SSL certificates that have a valid period of more than 1 year (398 days to be exact) as of 1st September 2020. This means that if, after that date, you order a certificate for your website that has a longer valid period then it will not be trusted on any Apple system, including iPhones, iPads, Apple computers, Safari, etc.
The policy that was unveiled at a Certificate Authority Browser Forum (CA/Browser) meeting on Wednesday (19/02/2020). Accordingly certificates issued after 1st September 2020 will not be trusted if they are longer than 1 year (398 days) but those that were issued before that date will still be honoured. Read More