如题，是否有其他朋友遇到类似问题。
我分析hal库，发现在“HAL_RTC_SetDate”函数中，有怎么一条判断，才导致无法写入日期：
  /* Reset time to be aligned on the same day */
  /* Read the time counter*/
  counter_time = RTC_ReadTimeCounter(hrtc);

  /* Fill the structure fields with the read parameters */
  hours = counter_time / 3600;
  if (hours > 24)
  {
    /* Set updated time in decreasing counter by number of days elapsed */
    counter_time -= ((hours / 24) * 24 * 3600);
    /* Write time counter in RTC registers */
    if (RTC_WriteTimeCounter(hrtc, counter_time) != HAL_OK)
    {
      /* Set RTC state */
      hrtc->State = HAL_RTC_STATE_ERROR;

      /* Process Unlocked */
      __HAL_UNLOCK(hrtc);

      return HAL_ERROR;
    }

    /* Read current AlARM counter in RTC registers */
    counter_alarm = RTC_ReadAlarmCounter(hrtc);

    /* Set again alarm to match with new time if enabled */
    if (counter_alarm != RTC_ALARM_RESETVALUE)
    {
      if(counter_alarm < counter_time)
      {
        /* Add 1 day to alarm counter*/
        counter_alarm += (uint32_t)(24 * 3600);

        /* Write new Alarm counter in RTC registers */
        if (RTC_WriteAlarmCounter(hrtc, counter_alarm) != HAL_OK)
        {
          /* Set RTC state */
          hrtc->State = HAL_RTC_STATE_ERROR;

          /* Process Unlocked */
          __HAL_UNLOCK(hrtc);

          return HAL_ERROR;
        }
      }
    }
  }