c++ - 如何在C ++中获取当前时间和日期？(How to get current time and date in C++?)

Question

有没有一种跨平台的方式来获取C ++中的当前日期和时间？

  ask by Max Frai translate from so

Answer 1

In C++ 11 you can use std::chrono::system_clock::now()

(在C ++ 11中，您可以使用std::chrono::system_clock::now())

Example (copied from en.cppreference.com ):

(示例（从en.cppreference.com复制）：)

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

int main()
{
    auto start = std::chrono::system_clock::now();
    // Some computation here
    auto end = std::chrono::system_clock::now();

    std::chrono::duration<double> elapsed_seconds = end-start;
    std::time_t end_time = std::chrono::system_clock::to_time_t(end);

    std::cout << "finished computation at " << std::ctime(&end_time)
              << "elapsed time: " << elapsed_seconds.count() << "s
";
}

This should print something like this:

(这应该是这样的：)

finished computation at Mon Oct  2 00:59:08 2017
elapsed time: 1.88232s