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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../../cpp/chrono/system_clock/to_time_t.html below:

std::chrono::system_clock::to_time_t - cppreference.com

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C-style date and time [edit] std::chrono::system_clock Member functions system_clock::now

system_clock::to_time_t

system_clock::from_time_t Time point I/O operator<< formatter<std::chrono::sys_time> from_stream [edit] 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.

Contents

[edit] Parameters t - system clock time point to convert [edit] Return value

A std::time_t value representing t.

[edit] Example

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

Run this code

#include <chrono>
#include <ctime>
#include <iostream>
#include <thread>
using namespace std::chrono_literals;
 
int main()
{
    // The old way
    std::time_t oldt = std::time({});
 
    std::this_thread::sleep_for(2700ms);
 
    // The new way
    auto const now = std::chrono::system_clock::now();
    std::time_t newt = std::chrono::system_clock::to_time_t(now);
 
    std::cout << "newt - oldt == " << newt - oldt << " s\n";
}

Possible output:

newt - oldt == 3 s
[edit] See also from_time_t

[static]

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

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