直接貼代碼吧：
static void display_time(void)
{
RTC_HandleTypeDef hrtc;
RTC_DateTypeDef date;
RTC_TimeTypeDef time;
HAL_RTC_GetTime(&hrtc, &time, RTC_FORMAT_BCD);
HAL_RTC_GetDate(&hrtc, &date, RTC_FORMAT_BCD);
printf("20%02x-%x-%x %02x:%02x:%02x\n", date.Year, date.Month, date.Date, time.Hours, time.Minutes, time.Seconds);
}
報錯信息：f:/321/Demos/oc_manhole_cover_template/oc_manhole_cover_template.c:394: undefined reference to `HAL_RTC_GetDate'
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