你可以使用下面的代码在c++中获取当前的系统日期和时间:

    #include <iostream>
    #include <time.h> //It may be #include <ctime> or any other header file depending upon
                     // compiler or IDE you're using 
    using namespace std;

    int main() {
       // current date/time based on current system
       time_t now = time(0);

       // convert now to string form
       string dt = ctime(&now);

       cout << "The local date and time is: " << dt << endl;
    return 0;
    }

PS:访问这个网站了解更多信息。

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

int main ()
{
  time_t rawtime;
  struct tm * timeinfo;

  time ( &rawtime );
  timeinfo = localtime ( &rawtime );
  printf ( "Current local time and date: %s", asctime (timeinfo) );

  return 0;
} 

从c++ 11开始，你可以使用std::chrono::system_clock::now()

示例(复制自en.cppreference.com):

#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"
              << std::endl;
}

这应该打印如下内容:

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

auto time = std::time(nullptr);
std::cout << std::put_time(std::localtime(&time), "%F %T%z"); // ISO 8601 format.

使用std::time()或std::chrono::system_clock::now()(或其他时钟类型)获取当前时间。

std::put_time() (c++ 11)和strftime() (C)提供了很多格式化程序来输出这些时间。

#include <iomanip>
#include <iostream>

int main() {
    auto time = std::time(nullptr);
    std::cout
        // ISO 8601: %Y-%m-%d %H:%M:%S, e.g. 2017-07-31 00:42:00+0200.
        << std::put_time(std::gmtime(&time), "%F %T%z") << '\n'
        // %m/%d/%y, e.g. 07/31/17
        << std::put_time(std::gmtime(&time), "%D"); 
}

格式化程序的顺序很重要:

std::cout << std::put_time(std::gmtime(&time), "%c %A %Z") << std::endl;
// Mon Jul 31 00:00:42 2017 Monday GMT
std::cout << std::put_time(std::gmtime(&time), "%Z %c %A") << std::endl;
// GMT Mon Jul 31 00:00:42 2017 Monday

strftime()的格式化器类似:

char output[100];
if (std::strftime(output, sizeof(output), "%F", std::gmtime(&time))) {
    std::cout << output << '\n'; // %Y-%m-%d, e.g. 2017-07-31
}

通常，大写格式器表示“完整版本”，小写格式器表示缩写(例如Y: 2017, Y: 17)。

区域设置改变输出:

#include <iomanip>
#include <iostream>
int main() {
    auto time = std::time(nullptr);
    std::cout << "undef: " << std::put_time(std::gmtime(&time), "%c") << '\n';
    std::cout.imbue(std::locale("en_US.utf8"));
    std::cout << "en_US: " << std::put_time(std::gmtime(&time), "%c") << '\n';
    std::cout.imbue(std::locale("en_GB.utf8"));
    std::cout << "en_GB: " << std::put_time(std::gmtime(&time), "%c") << '\n';
    std::cout.imbue(std::locale("de_DE.utf8"));
    std::cout << "de_DE: " << std::put_time(std::gmtime(&time), "%c") << '\n';
    std::cout.imbue(std::locale("ja_JP.utf8"));
    std::cout << "ja_JP: " << std::put_time(std::gmtime(&time), "%c") << '\n';
    std::cout.imbue(std::locale("ru_RU.utf8"));
    std::cout << "ru_RU: " << std::put_time(std::gmtime(&time), "%c");        
}

可能的输出(Coliru，编译器浏览器):

undef: Tue Aug  1 08:29:30 2017
en_US: Tue 01 Aug 2017 08:29:30 AM GMT
en_GB: Tue 01 Aug 2017 08:29:30 GMT
de_DE: Di 01 Aug 2017 08:29:30 GMT
ja_JP: 2017年08月01日 08時29分30秒
ru_RU: Вт 01 авг 2017 08:29:30

我已经使用std::gmtime()转换为UTC。提供Std::localtime()来转换为本地时间。

注意，在其他答案中提到的asctime()/ctime()现在被标记为已弃用，strftime()应该是首选。

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";
}

这适用于g++，我不确定这是否对你有帮助。 项目输出:

The current time is 11:43:41 am
The current date is 6-18-2015 June Wednesday 
Day of month is 17 and the Month of year is 6,
also the day of year is 167 & our Weekday is 3.
The current year is 2015.

代码:

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

using namespace std;

const std::string currentTime() {
time_t now = time(0);
struct tm tstruct;
char buf[80];
tstruct = *localtime(&now);
strftime(buf, sizeof(buf), "%H:%M:%S %P", &tstruct);
return buf;
}

const std::string currentDate() {
time_t now = time(0);
struct tm tstruct;
char buf[80];
tstruct = *localtime(&now);
strftime(buf, sizeof(buf), "%B %A ", &tstruct);
return buf;
}

int main() {
    cout << "\033[2J\033[1;1H"; 
std:cout << "The current time is " << currentTime() << std::endl;
    time_t t = time(0);   // get time now
    struct tm * now = localtime( & t );
    cout << "The current date is " << now->tm_mon + 1 << '-' 
         << (now->tm_mday  + 1) << '-'
         <<  (now->tm_year + 1900) 
         << " " << currentDate() << endl; 

 cout << "Day of month is " << (now->tm_mday) 
      << " and the Month of year is " << (now->tm_mon)+1 << "," << endl;
    cout << "also the day of year is " << (now->tm_yday) 
         << " & our Weekday is " << (now->tm_wday) << "." << endl;
    cout << "The current year is " << (now->tm_year)+1900 << "." 
         << endl;
 return 0;  
}