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);
tmptime = localtime(&tmpGetTime);
cout << tmptime->tm_mday << "/" <<tmptime->tm_mon+1 << "/" << 1900+tmptime->tm_year << " " << tmptime->tm_hour << ":" << tmptime->tm_min << ":" << tmptime->tm_sec<<">>";

Is there any way to add milliseconds to this?

Answer 1

To have millisecond precision you have to use system calls specific to your OS.

In Linux you can use

#include <sys/time.h>

timeval tv;
gettimeofday(&tv, 0);
// then convert struct tv to your needed ms precision

timeval has microsecond precision.

In Windows you can use:

#include <Windows.h>

SYSTEMTIME st;
GetSystemTime(&st);
// then convert st to your precision needs

Of course you can use Boost to do that for you :)

Answer 2

//C++11 Style:

cout << "Time in Milliseconds =" << 
 chrono::duration_cast<chrono::milliseconds>(chrono::steady_clock::now().time_since_epoch()).count() 
 << std::endl;

cout << "Time in MicroSeconds=" << 
 chrono::duration_cast<chrono::microseconds>(chrono::steady_clock::now().time_since_epoch()).count() 
 << std::endl;