How to get the last modification time of a file using C++?

The last modification time of a file can be obtained in C++ by using the std::filesystem::last_write_time function in the std::filesystem library. This function returns a std::chrono::file_time_type object that can be converted to the time_t type. for further processing or output.

How to use C++ to get the last modification time of a file

In C++, we can usestd::filesystem Library to obtain various information about files and directories, including the last modification time of the file.

Header file

#include <filesystem>

Get the last modification time of the file

Use std::filesystem::last_write_time The function can get the last modification time of the file and return a std::chrono::file_time_type object. We can use the std::chrono::system_clock::to_time_t function to convert this time to the time_t type so that it can be easily output or otherwise processed.

std::filesystem::path file_path("my_file.txt");
auto last_write_time = std::filesystem::last_write_time(file_path);
time_t time = std::chrono::system_clock::to_time_t(last_write_time);
std::cout << "Last modification time: " << std::ctime(&time) << std::endl;

Practical case

Suppose we have a file named myfile.txt with the path c:\my_folder\ myfile.txt. We can use the following code to get the last modification time of the file:

std::filesystem::path file_path("c:/my_folder/myfile.txt");
auto last_write_time = std::filesystem::last_write_time(file_path);
time_t time = std::chrono::system_clock::to_time_t(last_write_time);
std::cout << "Last modification time: " << std::ctime(&time) << std::endl;

The output is similar to:

Last modification time: Thu Jul 21 18:09:35 2023

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