unix输出时间的几种方式之clock_gettime函数（纳秒级）

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

int main(int argc, char** argv)
{
	struct timespec ts;
    struct tm *tmp;
	char time[64], buff[64];
	clock_gettime(CLOCK_REALTIME, &ts);
	tmp = localtime(&ts.tv_sec);
    strftime(time, 64, "%F,%T", tmp);
	snprintf(buff, sizeof(buff), "%s.%ld\n",time, ts.tv_nsec);
	printf("%s", buff);
	return 0;
}

编译

gcc time.cpp -o time

结果