std::experimental::filesystem::file_time_type(3)

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

Synopsis
   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.

Example
// 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';
     fs::remove(p);
 }

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