std::experimental::filesystem:: file_time_type

#include <chrono>
#include <experimental/filesystem>
#include <fstream>
#include <iomanip>
#include <iostream>
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'); // ファイルを作成
    auto ftime = fs::last_write_time(p);
    std::time_t cftime = decltype(ftime)::clock::to_time_t(ftime); // system_clockを仮定
    std::cout << "File write time is " << std::asctime(std::localtime(&cftime)) << '\n';
    fs::last_write_time(p, ftime + 1h); // ファイルの最終更新時刻を1時間未来に移動
    ftime = fs::last_write_time(p); // ファイルシステムから再読み込み
    cftime = decltype(ftime)::clock::to_time_t(ftime);
    std::cout << "File write time is " << std::asctime(std::localtime(&cftime)) << '\n';
    fs::remove(p);
}