Node.js fs.futimes() Method
Last Updated :
08 Oct, 2021
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The fs.futimes() method is used to asynchronously 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:
javascript
Output:
javascript
Output:
fs.futimes( fd, atime, mtime, callback )Parameters: This method accepts four parameters as mentioned above and described below:
- fd: It is an integer 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.
- callback: It is a function that would be called when the method is executed.
- err: It is an error that would be thrown if the method fails.
// Node.js program to demonstrate the
// fs.futimes() 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 futimes() function to assign
// the new timestamps to the file descriptor
fs.futimes(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);
});
Details before changing time: Modification Time: 2020-05-25T15:59:10.807Z Access Time: 2020-05-25T15:59:10.807Z Details after changing time: Changed Modification Time: 2020-05-25T16:01:34.915Z Changed Access Time: 2020-05-25T16:01:34.915ZExample 2:
// Node.js program to demonstrate the
// fs.futimes() 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("April 01, 2019 04:13:20");
let changedAccessTime = new Date("April 12, 2019 08:12:40");
// Use the futimes() function to assign
// the new timestamps to the file descriptor
fs.futimes(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);
});
Details before changing time: Modification Time: 2020-05-25T16:06:28.977Z Access Time: 2020-05-25T16:06:28.977Z Details after changing time: Changed Modification Time: 2019-03-31T22:43:20.000Z Changed Access Time: 2019-04-12T02:42:40.000ZReference: https://nodejs.org/api/fs.html#fs_fs_futimes_fd_atime_mtime_callback
