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Showing content from https://cplusplus.com/reference/chrono/system_clock/to_time_t/ below:

public static member function

std::chrono::system_clock::to_time_t

static time_t to_time_t (const time_point& tp) noexcept;

Convert to time_t

Converts tp into its equivalent of type time_t.

Parameters

tp: A time_point value.
time_point is a member type, defined as an alias of time_point<system_clock>.

Return value The time_t equivalent of tp.
time_t is a type defined in header <ctime>.

Example

// system_clock::to_time_t
#include <iostream>
#include <ctime>
#include <ratio>
#include <chrono>

int main ()
{
  using namespace std::chrono;

  duration<int,std::ratio<60*60*24> > one_day (1);

  system_clock::time_point today = system_clock::now();
  system_clock::time_point tomorrow = today + one_day;

  time_t tt;

  tt = system_clock::to_time_t ( today );
  std::cout << "today is: " << ctime(&tt);

  tt = system_clock::to_time_t ( tomorrow );
  std::cout << "tomorrow will be: " << ctime(&tt);

  return 0;
}

Possible output:

today is: Wed May 30 12:38:06 2012
tomorrow will be: Thu May 31 12:38:06 2012