The RTC in nRF52832 is a Real-Time Counter, not a Real-Time Clock. It is possible to keep track of time using the counter, but it does not support calendard or high presision timing. It is just a low-power timer running of the 32.768 kHz low frequency clock. The timer will not run when the chip is in system off low power mode or retain any data during reset.
If you need real-time clock, you will have to add an external chip handling this.
