#include <time.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

int main()
{
    struct tm timeVal;
    timeVal.tm_sec = 0;
    timeVal.tm_min = 0;
    timeVal.tm_hour = 0;
    timeVal.tm_mday = 1;
    timeVal.tm_mon = 0;
    timeVal.tm_year = 100;
    timeVal.tm_wday = 0;
    timeVal.tm_yday = 0;
    timeVal.tm_isdst = 0;
    timeVal.tm_gmtoff = 0;
    timeVal.tm_zone = NULL;

    errno = 0;
    time_t t = mktime(&timeVal);
    if (errno)
    {
        fprintf(stderr, "mktime: %s\n", strerror(errno));
    }
    else
    {
        printf("OK mktime: %ld\n", t);
    }

    return 0;
}