#include <iostream>
#include <chrono>
#include <iomanip>
#include <fstream>
#include <filesystem>
namespace fs = std::filesystem;
using namespace std::chrono_literals;
int main()
{
    fs::path p = fs::current_path() / "example.bin";
    std::ofstream(p.c_str()).put('a'); // 创建文件
    auto ftime = fs::last_write_time(p);
 
    std::time_t cftime = decltype(ftime)::clock::to_time_t(ftime);
 
    // 对此演示假定为 system_clock
    // 注意： MSVC 上非真； C++20 将允许可移植的输出
    std::time_t cftime = decltype(ftime)::clock::to_time_t(ftime);
    std::cout << "File write time is " << std::asctime(std::localtime(&cftime)) << '\n';
 
    fs::last_write_time(p, ftime + 1h); // 向未来移动文件写入时间 1 小时
    ftime = fs::last_write_time(p); // 从文件系统回读
 
    cftime = decltype(ftime)::clock::to_time_t(ftime);
    std::cout << "File write time is " << std::asctime(std::localtime(&cftime)) << '\n';
    fs::remove(p);
}