settimeofday

#include < sys/time.h >

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

int main(){
    struct timeval tv;
    struct tm tm;
    
    tm.tm_sec = 0;
    tm.tm_min = 0;
    tm.tm_hour = 0;
    tm.tm_mday = 1;
    tm.tm_mon = 0;
    tm.tm_year = 138;
    tm.tm_isdst = 0;
    tv.tv_sec = mktime(&tm);
    tv.tv_usec = 0;
    
    if (settimeofday(&tv, NULL) < 0){
        perror("settimeofday");
        return 1;
    }
    return 0;
}