我发现这个链接对我的实现非常有用: c++日期和时间

下面是我在实现中使用的代码，以获得清晰的“YYYYMMDD HHMMSS”输出格式。参数in用于在UTC和本地时间之间切换。您可以轻松地修改我的代码以满足您的需要。

#include <iostream>
#include <ctime>

using namespace std;

/**
 * This function gets the current date time
 * @param useLocalTime true if want to use local time, default to false (UTC)
 * @return current datetime in the format of "YYYYMMDD HHMMSS"
 */

string getCurrentDateTime(bool useLocalTime) {
    stringstream currentDateTime;
    // current date/time based on current system
    time_t ttNow = time(0);
    tm * ptmNow;

    if (useLocalTime)
        ptmNow = localtime(&ttNow);
    else
        ptmNow = gmtime(&ttNow);

    currentDateTime << 1900 + ptmNow->tm_year;

    //month
    if (ptmNow->tm_mon < 9)
        //Fill in the leading 0 if less than 10
        currentDateTime << "0" << 1 + ptmNow->tm_mon;
    else
        currentDateTime << (1 + ptmNow->tm_mon);

    //day
    if (ptmNow->tm_mday < 10)
        currentDateTime << "0" << ptmNow->tm_mday << " ";
    else
        currentDateTime <<  ptmNow->tm_mday << " ";

    //hour
    if (ptmNow->tm_hour < 10)
        currentDateTime << "0" << ptmNow->tm_hour;
    else
        currentDateTime << ptmNow->tm_hour;

    //min
    if (ptmNow->tm_min < 10)
        currentDateTime << "0" << ptmNow->tm_min;
    else
        currentDateTime << ptmNow->tm_min;

    //sec
    if (ptmNow->tm_sec < 10)
        currentDateTime << "0" << ptmNow->tm_sec;
    else
        currentDateTime << ptmNow->tm_sec;


    return currentDateTime.str();
}

输出(UTC, EST):

20161123 000454
20161122 190454

是的，你可以这样做的格式规则指定的当前填充区域:

#include <iostream>
#include <iterator>
#include <string>

class timefmt
{
public:
    timefmt(std::string fmt)
        : format(fmt) { }

    friend std::ostream& operator <<(std::ostream &, timefmt const &);

private:
    std::string format;
};

std::ostream& operator <<(std::ostream& os, timefmt const& mt)
{
    std::ostream::sentry s(os);

    if (s)
    {
        std::time_t t = std::time(0);
        std::tm const* tm = std::localtime(&t);
        std::ostreambuf_iterator<char> out(os);

        std::use_facet<std::time_put<char>>(os.getloc())
            .put(out, os, os.fill(),
                 tm, &mt.format[0], &mt.format[0] + mt.format.size());
    }

    os.width(0);

    return os;
}

int main()
{
    std::cout << timefmt("%c");
}

输出:周五9月6日20:33:31 2013

ffead-cpp为各种任务提供了多个实用程序类，其中一个类是Date类，它提供了从Date操作到日期算术的许多特性，还有一个Timer类用于计时操作。你也可以看看。

我需要一种方法在每次更新列表时插入当前日期-时间。 简单地说，这似乎很有效。

#include<bits/stdc++.h>
#include<unistd.h>
using namespace std;
int main()
{   //initialize variables
    time_t now; 
    //blah..blah
    /*each time I want the updated stamp*/
    now=time(0);cout<<ctime(&now)<<"blah_blah";
}

你可以尝试下面的跨平台代码来获取当前的日期/时间:

#include <iostream>
#include <string>
#include <stdio.h>
#include <time.h>

// Get current date/time, format is YYYY-MM-DD.HH:mm:ss
const std::string currentDateTime() {
    time_t     now = time(0);
    struct tm  tstruct;
    char       buf[80];
    tstruct = *localtime(&now);
    // Visit http://en.cppreference.com/w/cpp/chrono/c/strftime
    // for more information about date/time format
    strftime(buf, sizeof(buf), "%Y-%m-%d.%X", &tstruct);

    return buf;
}

int main() {
    std::cout << "currentDateTime()=" << currentDateTime() << std::endl;
    getchar();  // wait for keyboard input
}

输出:

currentDateTime()=2012-05-06.21:47:59

有关日期/时间格式的更多信息，请访问这里

我发现这个链接对我的实现非常有用: c++日期和时间

下面是我在实现中使用的代码，以获得清晰的“YYYYMMDD HHMMSS”输出格式。参数in用于在UTC和本地时间之间切换。您可以轻松地修改我的代码以满足您的需要。

#include <iostream>
#include <ctime>

using namespace std;

/**
 * This function gets the current date time
 * @param useLocalTime true if want to use local time, default to false (UTC)
 * @return current datetime in the format of "YYYYMMDD HHMMSS"
 */

string getCurrentDateTime(bool useLocalTime) {
    stringstream currentDateTime;
    // current date/time based on current system
    time_t ttNow = time(0);
    tm * ptmNow;

    if (useLocalTime)
        ptmNow = localtime(&ttNow);
    else
        ptmNow = gmtime(&ttNow);

    currentDateTime << 1900 + ptmNow->tm_year;

    //month
    if (ptmNow->tm_mon < 9)
        //Fill in the leading 0 if less than 10
        currentDateTime << "0" << 1 + ptmNow->tm_mon;
    else
        currentDateTime << (1 + ptmNow->tm_mon);

    //day
    if (ptmNow->tm_mday < 10)
        currentDateTime << "0" << ptmNow->tm_mday << " ";
    else
        currentDateTime <<  ptmNow->tm_mday << " ";

    //hour
    if (ptmNow->tm_hour < 10)
        currentDateTime << "0" << ptmNow->tm_hour;
    else
        currentDateTime << ptmNow->tm_hour;

    //min
    if (ptmNow->tm_min < 10)
        currentDateTime << "0" << ptmNow->tm_min;
    else
        currentDateTime << ptmNow->tm_min;

    //sec
    if (ptmNow->tm_sec < 10)
        currentDateTime << "0" << ptmNow->tm_sec;
    else
        currentDateTime << ptmNow->tm_sec;


    return currentDateTime.str();
}

输出(UTC, EST):

20161123 000454
20161122 190454