NAME

std::filesystem::file_time_type - std::filesystem::file_time_type

Synopsis

Defined in header <filesystem>
using file_time_type = std::chrono::time_point</*trivial-clock*/>; (since C++17)
(until C++20)
using file_time_type = (since C++20)
std::chrono::time_point<std::chrono::file_clock>;

Represents file time.

trivial-clock is an implementation-defined type that satisfies
TrivialClock and is sufficient to represent the resolution and range (until C++20)
of the file time values offered by the filesystem.

Example

// Run this code

#include <chrono>
#include <filesystem>
#include <format>
#include <fstream>
#include <iostream>

using namespace std::chrono_literals;

int main()
{
auto p = std::filesystem::temp_directory_path() / "example.bin";
std::ofstream(p.c_str()).put('a'); // create file

std::filesystem::file_time_type ftime = std::filesystem::last_write_time(p);
std::cout << std::format("File write time is {}\n", ftime);

std::filesystem::last_write_time(p, ftime + 1h); // move file write time 1 hour to the future
ftime = std::filesystem::last_write_time(p); // read back from the filesystem
std::cout << std::format("File write time is {}\n", ftime);

std::filesystem::remove(p);
}

Possible output:

File write time is Sun May 9 23:29:58 2021
File write time is Mon May 10 00:29:58 2021

See also

last_write_time gets or sets the time of the last data modification
(C++17) (function)