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Had a similar problem with an old iPod touch. I think once the system time gets screwed up iOS won’t connect to any website due to certificate security errors - ie iOS thinks its 1999 but all the website certs aren’t effective until 2019 for some reason.

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All x509 certificates have a “NotBeforeDate” value.

It does help with trust: if you know there was a specific date on which there was a cutoff of a vendor producing a certain type of weak certificate, for example, you can choose only to trust certificates from that provider after a certain NotBeforeDate.

All browsers will fail a certificate as invalid if your date is prior to the NotBeforeDate.

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