C/C++语言获取系统时间的几种方式

?C/C++???,?????????????:

1. time??:time?????1970?1?1???????????????time(NULL)????????

#include 
#include 

int main() {
    time_t currentTime;
    time(¤tTime);
    printf("Current time: %s", ctime(¤tTime));
    return 0;
}

2. clock??:clock???????????????????CLOCKS_PER_SEC?????????????

#include 
#include 

int main() {
    clock_t start = clock();
    // ???????????
    
    clock_t end = clock();
    double timeUsed = (double)(end - start) / CLOCKS_PER_SEC;
    printf("Time used: %lf seconds", timeUsed);
    return 0;
}

3. gettimeofday??:gettimeofday????????????????

#include 
#include 

int main() {
    struct timeval currentTime;
    gettimeofday(¤tTime, NULL);
    printf("Current time: %ld seconds, %ld microseconds", currentTime.tv_sec, currentTime.tv_usec);
    return 0;
}

4. localtime??:localtime????????????????

#include 
#include 

int main() {
    time_t currentTime;
    time(¤tTime);
    struct tm* localTime = localtime(¤tTime);
    printf("Current time: d-d-d d:d:d", 
            localTime->tm_year + 1900, localTime->tm_mon + 1, localTime->tm_mday,
            localTime->tm_hour, localTime->tm_min, localTime->tm_sec);
    return 0;
}

???C/C++???????????????,????????????????