如何用time_t更改日期和时间的格式?

时间:2017-09-14 05:34:48

标签: c++ date time formatting time-t

time_t now = time(0);  
std::string h = std::string (ctime (&now));

std::cout << "\nh: " << h;

我收到的当前输出是:Thu Sep 14 10:58:26 2017

我希望输出为2017-08-26-16-10-56

我可以对该输出做些什么?

2 个答案:

答案 0 :(得分:3)

使用strftime,如下所示:

strftime (buffer, 80,"%Y-%m-%d-%H-%M-%S",timeinfo);

完整代码:

#include <cstdio>
#include <ctime>

int main ()
{
  time_t rawtime;
  struct tm * timeinfo;
  char buffer [80];

  time (&rawtime);
  timeinfo = localtime (&rawtime);

  strftime (buffer, 80,"%Y-%m-%d-%H-%M-%S",timeinfo);
  puts (buffer);

  return 0;
}

输出:

  

2017-09-14-14-41-19

答案 1 :(得分:3)

使用std::put_time

#include <iomanip>

time_t now = time(0);
std::string h = std::put_time(localtime(&now), "%F-%H-%M-%S");
std::cout << "\nh: " << h;

输出

  

h:2017-09-14-05-54-02

更好的是,使用std::chrono

#include <iostream>
#include <iomanip>
#include <chrono>
using namespace std;

int main() {
    auto now = chrono::system_clock::to_time_t(chrono::system_clock::now());
    cout << put_time(localtime(&now), "%F-%H-%M-%S") << endl;
    return 0;
}