int getSecsFromCurrent(const char* endtimestr)
{
    time_t timepend ,timepnow ;
    struct tm  tmend  ;
    struct tm * tmnow  ;
    char strtoday[11]={0},strnow[9]={0},strCurrentdayEndTime[28]={0} ;
    int iTotalSecNum = 0 ;

    time(&timepnow);
    tmnow = localtime(&timepnow) ;
    sprintf(strtoday,"%04d-%02d-%02d",
        tmnow->tm_year + 1900,tmnow->tm_mon+1,tmnow->tm_mday);
    sprintf(strnow,"%02d:%02d:%02d",
        tmnow->tm_hour,tmnow->tm_min,tmnow->tm_sec);

    //strcpy(strCurrentdayEndTime,strtoday) ;
    //strcat(strCurrentdayEndTime," 14:50:00") ;
    sprintf(strCurrentdayEndTime,"%s %s",strtoday,endtimestr) ;

    memset(&tmend, 0, sizeof(struct tm));
    strptime(strCurrentdayEndTime,"%Y-%m-%d %H:%M:%S", &tmend);
    timepend = mktime(&tmend);
    iTotalSecNum =(int)difftime(timepend,timepnow);
    return iTotalSecNum ;
}

int main(int argc, char *argv[])
{
    for(int idx=0;idx<10;idx++){
        printf("(%d)\n",getSecsFromCurrent("12:12:13") ) ;
        sleep(1) ;
    } //for
}

 

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