I have looked through the forum and did not see anything mentioning a real time clock nor the DS3231.
I have the Raspberry Pi 4B running my info-beamer. Like all other RPi4B I have, I installed the Real-Time Clock (RTC) Module DS3231 on it. I have been trying to configure this to use it; but it seems we do not have access to make the changes needed to do so. With this in mind, I am submitting a Feature Request to have info-beamer give us an option to enable a RTC Module should be purchase and use one. This way the RPi can keep time even over reboots. Below are links to the RTC modules I purchased and the instruction page I use for my other RPi4Bs.
From what it looks like, it would be possible for info-beamer to add a box in their configuration section that would then run a script on the device to configure the RPi like the instructions say.
Using the RTC Module on the Raspberry