How to format std::chrono durations?

Question

Is there a convenient way to format std::chrono::duration to a specified format?

std::chrono::high_resolution_clock::time_point now, then;
then          


        

Answer 1

One can use something like:

#include 
#include 

//...

auto c(timeInMicroSec.count());
std::ostringstream oss;
oss << std::setfill('0')          // set field fill character to '0'
    << (c % 1000000000) / 1000000 // format seconds
    << "::"
    << std::setw(3)               // set width of milliseconds field
    << (c % 1000000) / 1000       // format milliseconds
    << "::"
    << std::setw(3)               // set width of microseconds field
    << c % 1000;                  // format microseconds
auto formatted(oss.str());