C++11時間操作

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <chrono>
#include <windows.h>
#include <ctime>

std::string GetCurrentSystemTime()
{
    auto timeNow = std::chrono::system_clock::to_time_t
        (std::chrono::system_clock::now());
    struct tm* pTimeNow = localtime(&timeNow);
    char szDate[60] = { 0 };
    sprintf(szDate, "%d-%02d-%02d %02d:%02d:%02d",
        (int)pTimeNow->tm_year + 1900, (int)pTimeNow->tm_mon + 1, (int)pTimeNow->tm_mday,
        (int)pTimeNow->tm_hour, (int)pTimeNow->tm_min, (int)pTimeNow->tm_sec);

    return std::string(szDate);
}

double GetEscapeTime()
{
    // 開始時間
    auto timeStart = std::chrono::steady_clock::now();
    Sleep(100);
    // 結束時間
    auto timeEnd = std::chrono::steady_clock::now();
    std::chrono::duration<double, std::milli> timeEscape = timeEnd - timeStart;
    return timeEscape.count();
}

void Convert2SystemClock(const std::string& strDate)
{
    struct tm tmNow;
    sscanf_s(strDate.c_str(), "%d-%02d-%02d %02d:%02d:%02d", &tmNow.tm_year, &tmNow.tm_mon, &tmNow.tm_mday, &tmNow.tm_hour
        , &tmNow.tm_min, &tmNow.tm_sec);
    tmNow.tm_year -= 1900;
    --tmNow.tm_mon;

    auto timeTmp = mktime(&tmNow);
    auto timeStart = std::chrono::system_clock::from_time_t(timeTmp);


    auto timeEnd = std::chrono::steady_clock::now();
    std::chrono::duration<double, std::milli> timeEscape = timeEnd - timeStart;
    std::cout << "After convert,Time-Escape:" << timeEscape.count() << std::endl;
}

int main()
{
    std::cout << "Time-Escape:" << GetEscapeTime() << std::endl;
    std::string strDate(GetCurrentSystemTime());
    std::cout << "Curr-time:" << strDate.c_str() << std::endl;

    Convert2SystemClock(strDate);
    system("pause");
    return 0;
}