std::experimental::filesystem::file_time_type (3) - Linux Manuals

std::experimental::filesystem::file_time_type: std::experimental::filesystem::file_time_type


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


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.


// Run this code

  #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
last_write_time (function)