程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define true 1

struct tm StartTime,EndTime;

void TimeingJudgment(struct tm)；

void SetTimeing()
{
    int Startday = 1;
    int Starthour = 0;
    int Startmin = 0;

    int Endday = 1;
    int Endhour = 0;
    int Endmin = 0;


    printf("please input start time \n");
    scanf("%d,%d,%d",&Startday,&Starthour,&Startmin);
    StartTime.tm_mday =Startday;
    StartTime.tm_hour =Starthour;
    StartTime.tm_min =Startmin;

    printf("please input end time \n");
    scanf("%d,%d,%d",&Endday,&Endhour,&Endmin);
    EndTime.tm_mday =Endday;
    EndTime.tm_hour =Endhour;
    EndTime.tm_min =Endmin;

}
void PowerOff()
{
    printf("Interval timing is not\n");
    system("pause");

}

main()
{
    
    int second = 0; //临时参数，用来与当前时间比较
    SetTimeing();
        while(true) //实现了每N秒钟执行一条语句的功能 
    {
        time_t   time_now = time(0); //调用系统函数，并初始化 
        struct   tm *time_p = localtime(&time_now);//gmtime(&time_now); //获取当前时间 

        TimeingJudgment(time_p)；
/*
        if(time_p->tm_mday < StartTime.tm_mday || time_p->tm_mday > EndTime.tm_mday)
        {
            PowerOff();
            return;
        }
        else if(StartTime.tm_mday == EndTime.tm_mday)//同一天
        {
            if(time_p->tm_hour < StartTime.tm_hour || time_p->tm_hour > EndTime.tm_hour)
            {
                PowerOff();
                return;
            }
            else if(StartTime.tm_hour == EndTime.tm_hour)//同一小时
            {
                if(time_p->tm_min < StartTime.tm_min || time_p->tm_min > EndTime.tm_min)
                {
                    PowerOff();
                    return;
                }
            }
        }
*/
    }
    
}


void TimeingJudgment(tm *time_Local)
{
    if(time_Local->tm_mday < StartTime.tm_mday || time_Local->tm_mday > EndTime.tm_mday)
    {
        PowerOff();
    }
    else if(StartTime.tm_mday == EndTime.tm_mday)//同一天
    {
        if(time_Local->tm_hour < StartTime.tm_hour || time_Local->tm_hour > EndTime.tm_hour)
        {
            PowerOff();
        }
        else if(StartTime.tm_hour == EndTime.tm_hour)//同一小时
        {
            if(time_Local->tm_min < StartTime.tm_min || time_Local->tm_min > EndTime.tm_min)
            {
                PowerOff();
            }
        }

    }


}