< cpp‎ | experimental‎ | fs
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Special mathematical functions (special math TR)
Defined in header <experimental/filesystem>
using file_time_type = chrono::time_point</*trivial-clock*/>;
(filesystem TS)

Represents file time. trivial-clock is an implementation-defined type that satisfies TrivialClock and is sufficient to represent the resolution and range of the file time values offered by the filesystem.


#include <iostream>
#include <chrono>
#include <iomanip>
#include <fstream>
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
using namespace std::chrono_literals;
int main()
    fs::path p = fs::current_path() / "example.bin";
    std::ofstream(p.c_str()).put('a'); // create file
    auto ftime = fs::last_write_time(p);
    std::time_t cftime = decltype(ftime)::clock::to_time_t(ftime); // assuming system_clock
    std::cout << "File write time is " << std::asctime(std::localtime(&cftime)) << '\n';
    fs::last_write_time(p, ftime + 1h); // move file write time 1 hour to the future
    ftime = fs::last_write_time(p); // read back from the filesystem
    cftime = decltype(ftime)::clock::to_time_t(ftime);
    std::cout << "File write time is " << std::asctime(std::localtime(&cftime)) << '\n';

Possible output:

File write time is Tue Mar 31 19:47:04 2015
File write time is Tue Mar 31 20:47:04 2015

See also

gets or sets the time of the last data modification