None of the above answers solved the same problem for me. Celilertop pointed correctly to the nature of the issue - the necessity to have the date reading when only time reading is needed. But his provided sequence must be reversed. Time reading must be prior to the date reading, not after, then the time reading returns correct updated values. This has a reason: using HAL apis read the "shadow" registers which are synchronized with "true" counting calendar registers using a flag RSF bit in RTC_ISR register.
Details of this are in Ref. Manual Ch.46.3.9 :
The RSF bit is set in RTC_ISR register each time the calendar registers are copied into the
RTC_SSR, RTC_TR and RTC_DR shadow registers. The copy is performed every
RTCCLK cycles. To ensure consistency between the 3 values, reading either RTC_SSR or
RTC_TR locks the values in the higher-order calendar shadow registers until RTC_DR is
read.
So the working calls to get time only (and both time and date) are:
HAL_RTC_GetTime(&hrtc, &now_t, RTC_FORMAT_BIN);
HAL_RTC_GetDate(&hrtc, &date_t, RTC_FORMAT_BIN); // required for Time register synchronization with calendar registers
BTW: Setting the BYPSHAD control bit to 1 is not recommended because you'll likely end up with out-of-sync values from the direct subsequent readings of the calendar registers (RTC counter keeps counting). Reading from the shadow registers (when BYPSHAD = 0) using HAL apis ensures the proper sync.
