c++ - How to get higher precision (fractions of a second) in a printout of current time? -

i've tried couple methods print out time system_clock can't other whole seconds:

system_clock::time_point = system_clock::now(); std::time_t now_c = system_clock::to_time_t(now);  std::cout<<ctime(&now_c); std::cout<<std::put_time(std::localtime(&now_c), "%t")<<" "; 

does now() function hold high precision data, or can't find function extracts information printing?

note: not looking calculate time interval. want current time fractions of second, , print out via cout. can't find way this.

and know std::chrono::high_resolution_clock see no way print out now(). additionally, setprecision function has no effect on output of put_time or ctime.

i've been getting answers not address question.

you can following:

#include <chrono> #include <ctime> #include <iostream> #include <string>  std::string getlocaltime() {   auto now(std::chrono::system_clock::now());   auto seconds_since_epoch(       std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch()));    // construct time_t using 'seconds_since_epoch' rather 'now' since   // implementation-defined whether value rounded or truncated.   std::time_t now_t(       std::chrono::system_clock::to_time_t(           std::chrono::system_clock::time_point(seconds_since_epoch)));    char temp[10];   if (!std::strftime(temp, 10, "%h:%m:%s.", std::localtime(&now_t)))     return "";    return std::string(temp) +       std::to_string((now.time_since_epoch() - seconds_since_epoch).count()); }  int main() {   std::cout << getlocaltime() << '\n';   return 0; }