Question

How to get the current date and time in C++

Answer 1

#include <iostream>
#include <chrono>
#include <ctime>  


int main() {
    auto startd = std::chrono::system_clock::now();
    auto endd = std::chrono::system_clock::now();

    std::chrono::duration<double> elapsed_seconds = endd - startd;
    std::time_t end_time = std::chrono::system_clock::to_time_t(endd);

    std::cout << std::ctime(&end_time);
}


/*
run:

Fri Jun 12 15:23:31 2020

*/

 

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Answer 2

#include <iostream>
#include <ctime>  

int main() {
    time_t now = time(0);

    char *dt = ctime(&now);

    std::cout << dt << "\n";
}



/*
run:

Fri Jun 12 17:00:31 2020

*/

 

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Answer 3

#include <iostream>
#include <ctime>  

int main() {
   time_t now = time(0);

   tm *ltm = localtime(&now);

   std::cout << 1900 + ltm->tm_year << "-" << 1 + ltm->tm_mon << "-" << ltm->tm_mday;
   std::cout << " " << 1 + ltm->tm_hour << ":";
   std::cout << 1 + ltm->tm_min << ":";
   std::cout << 1 + ltm->tm_sec << "\n";
}



/*
run:

2020-6-12 18:11:9

*/

 

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