Resolved! The caliberation for RTC is one of those "nice to have" feature, not exactly something you should count on right? Should you use it and hope for a meaningful result?
I'm using STM32L431xx series mcus and as with most STM32 mcus, it has an RTC feature with calendar. The RTC has a calibration function by which you can fine-tune the counting scheme of the RTC and improve upon the accuracy of your clock source.This...