clock_gettime() sample

#include <stdio.h>
#include <time.h>
int main(void) {
  struct timespec ts;
  struct tm tm;
  clock_gettime(CLOCK_REALTIME, &ts);
  localtime_r(&ts.tv_sec, &tm);
  printf("tv_sec=%ld, tv_nsec=%ld\n", ts.tv_sec, ts.tv_nsec);
  printf("%d-%02d-%02dT%02d:%02d:%02d.%09ld\n", tm.tm_year + 1900,
         tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec,
         ts.tv_nsec);
}