std::filesystem::file_time_type last_write_time() const;
(1) (since C++17)
std::filesystem::file_time_type last_write_time( std::error_code& ec ) const noexcept;
(2) (since C++17)

If the last modification time is cached in this directory_entry, returns the cached value. Otherwise, returns:


[edit] Parameters

ec - out-parameter for error reporting in the non-throwing overload

[edit] Return value

The last modification time for the referred-to filesystem object.

[edit] Exceptions

Any overload not marked noexcept may throw std::bad_alloc if memory allocation fails.

1) Throws std::filesystem::filesystem_error on underlying OS API errors, constructed with p as the first path argument and the OS error code as the error code argument.
2) Sets a std::error_code& parameter to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur.

[edit] Example

#include <chrono>
#include <ctime>
#include <filesystem>
#include <format>
#include <iostream>
#include <string>
std::string to_string(const std::filesystem::file_time_type& ftime)
#if __cpp_lib_format
    return std::format("{:%c}", ftime);
    std::time_t cftime = std::chrono::system_clock::to_time_t(
    std::string str = std::asctime(std::localtime(&cftime));
    str.pop_back(); // rm the trailing '\n' put by `asctime`
    return str;
int main()
    auto dir = std::filesystem::current_path();
    using Entry = std::filesystem::directory_entry;
    for (Entry const& entry : std::filesystem::directory_iterator(dir))
        std::cout << to_string(entry.last_write_time()) << " : "
                  << entry.path().filename() << '\n';

Possible output:

Wed Sep  6 13:37:13.960314156 2023 : "main.cpp"
Wed Sep  6 13:37:42.690271828 2023 : "a.out"

[edit] See also

gets or sets the time of the last data modification
(function) [edit]