#include <stdio.h>

#include <time.h>

#include <windows.h>

#define PRINT_ALL    0xff

#define PRINT_DATE    (1 << 0)

#define PRINT_TIME    (1 << 1)

void printTime(time_t nowtime, int iFlag)

{

    struct tm *timeinfo;

    timeinfo = localtime( &nowtime );

    int year, month, day, hour, min, sec;

    year = timeinfo->tm_year + ;

    month = timeinfo->tm_mon + ;

    day = timeinfo->tm_mday;

    hour = timeinfo->tm_hour;

    min = timeinfo->tm_min;

    sec = timeinfo->tm_sec;

    if(iFlag & PRINT_DATE)

    {

        printf("%d-%d-%d ", year, month, day);

    }

    if(iFlag & PRINT_TIME)

    {

        printf("%02d:%02d:%02d", hour, min, sec);

    }

    fflush(stdout);

}

int main()

{

    int iRunTime = GetTickCount();

    time_t nowtime;

    time( &nowtime );

    printf("Now          : ");

    printTime(nowtime, PRINT_ALL);

    printf("\n");

    time_t DateTime = nowtime - (iRunTime / );

    printf("System start : ");

    printTime(DateTime, PRINT_ALL);

    printf("\n");

    int iH, iM, iS, iSec;

    iSec = iRunTime / ;

    iH = iSec / ;

    iM = iSec /  % ;

    iS = iSec % ;

    printf("System run   : %02d:%02d:%02d\n", iH, iM, iS);

    return ;

}

#include <stdio.h>

#include <sys/sysinfo.h>

#include <time.h>

#include <errno.h>

#include <string.h>

static int print_system_boot_time()

{

    struct sysinfo info;

    time_t cur_time = ;

    time_t boot_time = ;

    struct tm *ptm = NULL;

    if (sysinfo(&info))

    {

        fprintf(stderr, "Failed to get sysinfo, errno:%u, reason:%s\n",

                errno, strerror(errno));

        return -;

    }

    time(&cur_time);

    if (cur_time > info.uptime)

    {

        boot_time = cur_time - info.uptime;

    }

    else

    {

        boot_time = info.uptime - cur_time;

    }

    ptm = gmtime(&boot_time);

    printf("System boot time: %d-%-d-%d %d:%d:%d\n", ptm->tm_year + ,

            ptm->tm_mon + , ptm->tm_mday, ptm->tm_hour, ptm->tm_min, ptm->tm_sec);

    return ;

}

int main()

{

    if (print_system_boot_time() != )

    {

        return -;

    }

    return ;

}

$ ./getSysRunTime

System boot time: -- ::