NAME

std::chrono::system_clock::to_time_t - std::chrono::system_clock::to_time_t

Synopsis

static std::time_t to_time_t( const time_point& t ) noexcept; (since C++11)

Converts t to a std::time_t type.

If std::time_t has lower precision, it is implementation-defined whether the value
is rounded or truncated.

Parameters

t - system clock time point to convert

Return value

A std::time_t value representing t.

Example

Get the current time as a std::time_t two ways.

// Run this code

#include <iostream>
#include <ctime>
#include <chrono>
#include <thread>
using namespace std::chrono_literals;

int main()
{
// The old way
std::time_t oldt = std::time(nullptr);

std::this_thread::sleep_for(2700ms);

// The new way
std::time_t newt = std::chrono::system_clock::to_time_t(
std::chrono::system_clock::now());

std::cout << "oldt-newt == " << oldt-newt << " s\n";
}

Possible output:

oldt-newt == -3 s

See also

from_time_t converts std::time_t to a system clock time point
[static] (public static member function)