utc时间转换 linux c

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

int main() {
    time_t now = time(NULL);
    struct tm *utc_time = gmtime(&now);

    printf("Current UTC time: %s", asctime(utc_time));
    return 0;
}

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

int main() {
    struct tm utc_tm = {0};
    utc_tm.tm_year = 2023 - 1900; // 年份减去1900
    utc_tm.tm_mon = 10 - 1;       // 月份减去1
    utc_tm.tm_mday = 1;           // 日期
    utc_tm.tm_hour = 12;          // 小时
    utc_tm.tm_min = 0;            // 分钟
    utc_tm.tm_sec = 0;            // 秒

    time_t timestamp = mktime(&utc_tm);
    printf("Unix timestamp: %ld\n", (long)timestamp);
    return 0;
}

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

int main() {
    time_t timestamp = 1667270400; // 示例Unix时间戳
    struct tm *utc_time = gmtime(&timestamp);

    printf("UTC time from timestamp: %s", asctime(utc_time));
    return 0;
}

#include <time.h>

int main() {
    tzset(); // 设置时区
    // 其他时间操作
    return 0;
}

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

int main() {
    struct timespec ts;
    clock_gettime(CLOCK_REALTIME, &ts);
    printf("High precision timestamp: %ld.%09ld\n", ts.tv_sec, ts.tv_nsec);
    return 0;
}