RTC_TimeTypeDef sTime;
  RTC_DateTypeDef sDate;
   HAL_PWR_EnableBkUpAccess();
   __HAL_RTC_WRITEPROTECTION_DISABLE(&hrtc);
   __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
   __HAL_RCC_RTC_ENABLE();
  hrtc.Instance = RTC;
  hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
  hrtc.Init.AsynchPrediv = 124;
  hrtc.Init.SynchPrediv = 295;
  hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
  hrtc.Init.OutPutRemap = RTC_OUTPUT_REMAP_PC13;
  hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_LOW;
  hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
  HAL_RTC_Init(&hrtc);

  sTime.Hours = 0;
  sTime.Minutes = 0;
  sTime.Seconds = 0;
  sTime.SubSeconds = 0;
  sTime.TimeFormat = RTC_HOURFORMAT_24;
  sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sTime.StoreOperation = RTC_STOREOPERATION_SET;
  HAL_RTC_SetTime(&hrtc, &sTime, FORMAT_BIN);

  sDate.WeekDay = RTC_WEEKDAY_FRIDAY;
  sDate.Month = RTC_MONTH_NOVEMBER;
  sDate.Date = 24;
  sDate.Year = 15;
  HAL_RTC_SetDate(&hrtc, &sDate, FORMAT_BIN);

HAL_RTC_GetTime(&hrtc, &time, FORMAT_BIN);
HAL_RTC_GetDate(&hrtc, &date, FORMAT_BIN);   
printf("Aktualna godzina: %d:%d:%d\n\r", time.Hours, time.Minutes, time.Seconds);