Write time to a .txt file

time_to_file.cpp

#include <iomanip>
#include <chrono>
#include <ctime>
#include <iostream>
#include <string>
#include <fstream>

int main ()
{
    auto now = std::chrono::system_clock::now();
    auto in_time_t = std::chrono::system_clock::to_time_t(now);

    std::stringstream ss;
    ss << std::put_time(std::localtime(&in_time_t), "%Y-%m-%d %X");
    std::cout << ss.str() << std::endl;

    std::ofstream file;
    file.open("your_example.txt");
    file << ss.str() << std::endl;
    file.close();
    return 0;
}

// in bash
// date "+%Y-%m-%d %H:%M:%S" > TIME.TXT