print time_point

print_time.cc

#include <iostream>
#include <chrono>
#include <ctime>
#include <iomanip>
#include <sstream>
#include <string>

using namespace std::chrono;

int main(){
    
    auto conv_time = [](time_point<system_clock> tpt){
    std::time_t t = system_clock::to_time_t(tpt);
    std::stringstream ss;
    std::tm tm = *std::localtime(&t);
    ss << std::put_time(&tm, "%H:%M:%S") << '\n';
    return ss.str();
};
    //set time_point to current time
    auto  time_point = system_clock::now();
    std::cout << conv_time(time_point) << std::endl;
    return 0;
}