Node.js fs.futimesSync() Method

The fs.futimesSync() method is used to synchronously change the modification and access timestamps of given file descriptor. The timestamps can be specified using a number, string, or Date object. An error would be thrown if the timestamp cannot be converted to a proper number, or is NaN, Infinity or -Infinity.

Syntax:

fs.futimesSync( fd, atime, mtime )

Parameters: This method accepts three parameters as mentioned above and described below:

• fd: It is an integer value that denotes the file descriptor of the file whose timestamps have to be changed.
• atime: It is number, string or Date object that denotes the new access timestamp to be set.
• mtime: It is number, string or Date object that denotes the new modification timestamp to be set.

Below examples illustrate the fs.futimesSync() method in Node.js:

Example 1:

// Node.js program to demonstrate the
// fs.futimesSync() method

// Import the filesystem module
const fs = require('fs');

// Get the file descriptor of the file
const fd = fs.openSync("example_file.txt", "r+");

console.log("Details before changing time:");

// Get the stats object of the file
prevStats = fs.statSync("example_file.txt");

// Access the modified and access time of the file
console.log("Modification Time:", prevStats.mtime);
console.log("Access Time:", prevStats.atime);

// Get the current time to change the timestamps
let changedModifiedTime = new Date();
let changedAccessTime = new Date();

// Use the futimesSync() function to assign
// the new timestamps to the file descriptor
fs.futimesSync(fd, changedAccessTime, changedModifiedTime);

// Get the stats object of the file
console.log("\nDetails after changing time:");

// Get the stats object of the file
changedStats = fs.statSync("example_file.txt");

// Access the changed modified and access time of the file
console.log("Changed Modification Time:", changedStats.mtime);
console.log("Changed Access Time:", changedStats.atime);

Output:

Details before changing time:
Modification Time: 2015-12-20T19:42:00.000Z
Access Time: 2020-05-25T15:40:13.508Z

Details after changing time:
Changed Modification Time: 2020-05-25T15:52:21.546Z
Changed Access Time: 2020-05-25T15:52:21.546Z

Example 2:

// Node.js program to demonstrate the
// fs.futimesSync() method

// Import the filesystem module
const fs = require('fs');

// Get the file descriptor of the file
const fd = fs.openSync("example_file.txt", "r+");

console.log("Details before changing time:");

// Get the stats object of the file
prevStats = fs.statSync("example_file.txt");

// Access the modified and access time of the file
console.log("Modification Time:", prevStats.mtime);
console.log("Access Time:", prevStats.atime);

// Get the current time to change the timestamps
let changedModifiedTime = new Date("March 16, 2019 04:12:00");
let changedAccessTime = new Date("December 18, 2019 08:15:00");

// Use the futimesSync() function to assign
// the new timestamps to the file descriptor
fs.futimesSync(fd, changedAccessTime, changedModifiedTime);

// Get the stats object of the file
console.log("\nDetails after changing time:");

// Get the stats object of the file
changedStats = fs.statSync("example_file.txt");

// Access the changed modified and access time of the file
console.log("Changed Modification Time:", changedStats.mtime);
console.log("Changed Access Time:", changedStats.atime);

Output:

Details before changing time:
Modification Time: 2020-05-25T15:52:21.546Z
Access Time: 2020-05-25T15:52:21.604Z

Details after changing time:
Changed Modification Time: 2019-03-15T22:42:00.000Z
Changed Access Time: 2019-12-18T02:45:00.000Z

Reference: https://nodejs.org/api/fs.html#fs_fs_futimessync_fd_atime_mtime