I had a similar problem with mine where the clock was out and preventing it from syncing or updating.
The solution i was told (and which worked for me) was to plug it into a computer for a while - I assume that some time syncing must happen in the background when it’s connected via usb.
Had the very same issue, couldn't even update the firmware - after some tinkering turns out the solution is fairly simple - ssh into it, disable ntp, set the correct time, enable ntp, reboot.