C++擷取系統目前時間(精确到毫秒)

1. 代碼實作

#include "stdafx.h"
#include <string>
#include <chrono>
#include <iostream>

using namespace std;

//擷取時間标記
time_t getTimeStamp()
{
	std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds> tp =
		std::chrono::time_point_cast<std::chrono::milliseconds>(std::chrono::system_clock::now());
	auto tmp = std::chrono::duration_cast<std::chrono::milliseconds>(tp.time_since_epoch());
	time_t timestamp = tmp.count();
	return timestamp;
}
//擷取時間 年-月-日 時-分-秒 毫秒
std::string gettm(__int64 timestamp)
{
	__int64 milli = timestamp + (__int64)8 * 60 * 60 * 1000;
	auto mTime = std::chrono::milliseconds(milli);
	auto tp = std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds>(mTime);
	auto tt = std::chrono::system_clock::to_time_t(tp);
	std::tm now;
	::gmtime_s(&now,&tt);
	char res[64] = { 0 };
	sprintf_s(res, _countof(res), "%4d-%02d-%02d %02d:%02d:%02d.%03d", now.tm_year + 1900, now.tm_mon + 1, now.tm_mday, now.tm_hour, now.tm_min, now.tm_sec, static_cast<int>(milli % 100));
	return std::string(res);
}

int main(void)
{
	cout << gettm(getTimeStamp()).c_str() << endl;

	system("pause");
	return 0;
}
           

可自行格式化時間輸出格式

1. 運作截圖