Greetings @mih44435,
On initial impression my suggestion would be similar to the ToradexAI, which is to use the RTC to store/set the time on your system. More details about the RTC can be found here: Real-Time Clock / RTC (Linux) | Toradex Developer Center
In theory on first boot you could have a script that run on startup to set an initial time for the system. This time can then be written to the RTC which can then be used as the source of truth for time going forward.
Best Regards,
Jeremias