Capturing a time in milliseconds

Question

The following piece of code is used to print the time in the logs:

#define PRINTTIME() struct tm  * tmptime;
time_t     tmpGetTime;
time(&tmpGetTime);
tm         


        

Answer 1

In Ubuntu 16.04 this worked for me...

const std::string currentDateTime() {
   char            fmt[64], buf[64];
   struct timeval  tv;
   struct tm       *tm;

   gettimeofday(&tv, NULL);
   tm = localtime(&tv.tv_sec);
   strftime(fmt, sizeof fmt, "%Y-%m-%d %H:%M:%S.%%06u", tm);
   snprintf(buf, sizeof buf, fmt, tv.tv_usec);
   return buf;
}

Then, with...

std::cout << currentDateTime();

I get...

2016-12-29 11:09:55.331008