Brand new installation fails to set RPi 3 B+ Date leading to certificate problem and supervisor not starting

Setting up a brand new installation of HA SO on a RPi 3 B+ leads to HA SO never starting.
Supervisor gets stuck with no connection and retrying every 30 secs.
There is one error before the retry saying:
x509: certificate has expired or is not yet valid

And the date is clearly wrong, it shows we are in February 2021, instead of September as of today.

Since I cannot ssh directly to the Rpi and I could not find a way to do it on HA Cli I’m stuck not being able to set the Rpi proper date. I tried 2 perfectly good and working RPIs.

Trying to get anything else running only outputs an error saying supervisor doesn’t have internet connection.

Rebooting the Pi makes it only worst, this time supervisor wont even try, there is an error and an immediate SIGKILL.

The Pi is connected directly to LAN (although wifi was set, it’s the same result). Tried checking on the NTP on my router and even restarting the router but its the same.

What can I do?

Connect a keyboard and monitor to the pi and use the CLI there.

https://www.home-assistant.io/common-tasks/os#console-access

That’s how I have it connected and how I know what the supervisor does and the log says.

Pardon my ignorance, but how do I set the right date using HA cli? I cannot set any Linux command from it nor exit the ha cli.

Type login then press [Enter]

To log in to the physical console the username is root, with no password.

You are now at the OS command prompt.