Extrahiert timestamp und localtime aus `UUID`

time_from_uuid.c

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

int main(int argc, char** argv){
  if(argc<2) return 1;

  uuid_t uuid;
  if( uuid_parse(argv[1],uuid) < 0 ){
    return 1;
  }

  time_t time;
  struct timeval ret_tv;
  time = uuid_time(uuid, &ret_tv);

  printf("timestamp: %ld\n", time);

  struct tm *tm;
  char fmt[64], buf[64];
  if((tm = localtime(&ret_tv.tv_sec)) != NULL){
    strftime(fmt, sizeof fmt, "%Y-%m-%d %H:%M:%S.%%06u %z", tm);
    snprintf(buf, sizeof buf, fmt, ret_tv.tv_usec);
    printf("localtime: %s\n", buf);
  }

  return 0;
}