Print current system time in nanoseconds using c++ chrono [closed]

Answer 1

[EDIT]

Changing the code to C++ style:

#include 
#include 

std::chrono::time_point now = std::chrono::system_clock::now();
auto duration = now.time_since_epoch();

typedef std::chrono::duration
>::type> Days; /* UTC: +8:00 */

Days days = std::chrono::duration_cast(duration);
    duration -= days;
auto hours = std::chrono::duration_cast(duration);
    duration -= hours;
auto minutes = std::chrono::duration_cast(duration);
    duration -= minutes;
auto seconds = std::chrono::duration_cast(duration);
    duration -= seconds;
auto milliseconds = std::chrono::duration_cast(duration);
    duration -= milliseconds;
auto microseconds = std::chrono::duration_cast(duration);
    duration -= microseconds;
auto nanoseconds = std::chrono::duration_cast(duration);

std::cout << hours.count() << ":"
          << minutes.count() << ":"
          << seconds.count() << ":"
          << milliseconds.count() << ":"
          << microseconds.count() << ":"
          << nanoseconds.count() << std::endl;

Result:

17:56:14:94:451:679

[Old]

A simply example:

#include 

char fmt[64];
char buf[64];
struct timeval tv;
struct tm *tm;

gettimeofday (&tv, NULL);
tm = localtime (&tv.tv_sec);
strftime (fmt, sizeof (fmt), "%H:%M:%S:%%06u", tm);
snprintf (buf, sizeof (buf), fmt, tv.tv_usec);
printf ("%s\n", buf);

Result:

00:01:32:695240