SDK version: nRF5_SDK_15.3.0
Platform: nRF52840 DK
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I use ble_app_blinky example and use nrf5-calendar(https://github.com/NordicPlayground/nrf5-calendar-example) to calculate timestamp by RTC0.
I put the RTC config and calendar function into the main function of ble_app_blinky. As below.

and add print_current_time() into button_event_handler() to show calendar log and save it when I press button.
I got the log as below when I run the example.
I print CAL->COUNTER in nrf_cal_get_time() function.
I don't know the value of CAL->COUNTER is increasing rapidly when I pressed button per second.

Thank you.