2-7. Working with Time

在c14中已经，已经添加了chrono库，用于获取关于时间的库函数

1. Getting the Current Date and Time

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

using namespace std;
using namespace chrono;

int main()
{
    auto currentTimePoint = system_clock::now();
    auto currentTime = system_clock::to_time_t( currentTimePoint );
    auto timeText = ctime( &currentTime );
    cout << timeText << endl;
    return 0;
}

2.Comparing Times

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

using namespace std;
using namespace chrono;
using namespace literals;

int main()
{
    auto startTimePoint = system_clock::now();
    this_thread::sleep_for(5s);
    auto endTimePoint = system_clock::now();
    auto timeTaken = duration_cast<milliseconds>(endTimePoint - startTimePoint);
    cout << "Time Taken: " << timeTaken.count() << endl;
    return 0;
}