It is just a dead CMOS battery. So the clock had the wrong time, which in turn also causes the log entries to have the wrong time and date. Simply replace the battery. It is most likely of the CR2032 type.

The worst part is that Nextcloud isn’t even really in competition with Google. Setting up a Nextcloud server isn’t hard, but it’s not a trivial task. Sharing it outside your local network also requires a bit of skill, especially if done securely. That is to say, Nextcloud users probably tend to be more tech-savvy.

That’s only true for those who self-host this. There are lots of companies offering Nextcloud hosting. That’s probably why Google doesn’t like Nextcloud. I’m not saying Google is right. Actually what Google is doing here is quite pathetic.

I understand their reasoning behind this, but I am not sure, this is such a good idea. Imagine Letsencrypt having technical issues or getting DDoS’d. If the certificates are valid for 90 days and are typically renewed well in advance, no real problem arises, but with only 6 days in total, you really can’t renew them all that much in advance, so this risk of lots of sites having expired certificates in such a situation appears quite large to me.