c++11 std::chrono

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

int main (int argc, char ** argv)
{
auto begin_clock = std::chrono::system_clock::now();

std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
std::time_t time = std::chrono::system_clock::to_time_t(now +
std::chrono::hours(24*5));
struct tm ti = *std::localtime(&time);

char date_time_buf[32];
sprintf(date_time_buf, "%04d-%02d-%02d %02d:%02d:%02d", 1900 + ti.tm_year,
ti.tm_mon + 1, ti.tm_mday, ti.tm_hour, ti.tm_min, ti.tm_sec);

std::cout << date_time_buf << std::endl;

auto end_clock = std::chrono::system_clock::now();
std::cout << std::chrono::duration_cast<std::chrono::microseconds>
(end_clock - begin_clock).count() << std::endl;

return 0;
}