Hi @Anonymous ,
As a hardware setup, you may need to configure the time stamp pin to detect time stamp events and an LSE if an accurate timing is required, otherwise you may use the LSI as RTC clock source.
I recommend you to refer to AN4759: "Using the hardware real-time clock (RTC) and the tamper management unit (TAMP) with STM32 microcontrollers".
This application note describes the features of the RTC and how to configure it to implement several use cases: calendar, alarm, wakeup, timestamp, tamper detection, calibration.
It makes also reference to all RTC related examples available in the STM32Cube package. So for timestamp function, you can have a look to the example STM32Cube_FW_L4_V1.15.1\Projects\NUCLEO-L412RB-P\Examples\RTC\RTC_TimeStamp.
-Amel
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