You can skip the ntp/systemd-timesyncd/fake-hwclock stuff if you add a RTC/coin battery to the device. The Raspberry Pi 5 has built-in RTC with support for an o

You can skip the ntp/systemd-timesyncd/fake-hwclock stuff if you add a RTC/coin battery to the device. The Raspberry Pi 5 has built-in RTC with support for an official battery which costs about five bucks and works well for this. Older devices have aftermarket RTC's with battery backups as well.