我使用RTC 进行休眠唤醒，进入休眠电流值 OK， RTC 也能唤醒，但是唤醒后 RTC 读到的时间就不对了，请问是什么原因

HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN);

sTime.Seconds  = sTime.Seconds  + 30;
if(sTime.Seconds>=60)
{
    sTime.Seconds = sTime.Seconds -60;
    sTime.Minutes = sTime.Minutes +1;
}
if(sTime.Minutes >=60)
{
    sTime.Minutes = sTime.Minutes  -60;
    sTime.Hours  = sTime.Hours  +1;

}

g_sAlarm.AlarmTime.Hours = sTime.Hours ; g_sAlarm.AlarmTime.Minutes = sTime.Minutes; g_sAlarm.AlarmTime.Seconds = sTime.Seconds; g_sAlarm.Alarm= RTC_ALARM_A;

// HAL_PWR_EnableBkUpAccess();

HAL_RTC_SetAlarm_IT(&hrtc, &g_sAlarm, RTC_FORMAT_BIN);

HAL_Delay(1);


HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);

__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);

HAL_PWR_EnableBkUpAccess();                 

// HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI); // HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
HAL_PWR_EnterSTANDBYMode();

SystemClock_Config();

// SystemClock_RestoreFromStop(); MX_GPIO_Init(); MX_TIM6_Init(); MX_ADC1_Init(); // MX_RTC_Init(); // My_RTC_Init(); MX_SPI2_Init(); MX_UART4_Init(); HAL_Delay(10); Fun_Main_Init();