Node.js fsPromises.utimes() Method
Last Updated :
08 Oct, 2021
The fsPromises.utimes() method is used to asynchronously change the modification and access timestamps of a file. 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.
It changes the file system timestamps of the object referenced by path then resolves the Promise with no arguments upon success.
Syntax:
fsPromises.utimes( path, atime, mtime )
Parameters: This method accepts three parameters as mentioned above and described below:
- path: It is a string that denotes the path 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.
The atime and mtime arguments follow these rules:
- Values can be either number representing Unix epoch time, Dates, or a numeric string like ‘123456789.0’.
- If the value can not be converted to a number, or is NaN, Infinity or -Infinity, an Error will be thrown.
Example: This example to illustrate the fsPromises.utimes() method in Node.js. Create a example_gfg.txt file for input.
Filename: index.js
const fs = require( 'fs' );
const fsPromises = require( 'fs' ).promises;
console.log( "Details before changing time:" );
prevStats = fs.statSync( "example_gfg.txt" );
console.log( "Modification Time:" , prevStats.mtime);
console.log( "Access Time:" , prevStats.atime);
let newModifiedTime = new Date();
let newAccessTime = new Date();
fsPromises.utimes( "example_file.txt" ,
newAccessTime, newModifiedTime);
console.log( "\nDetails after changing time:" );
changedStats = fs.statSync( "example_gfg.txt" );
console.log( "Changed Modification Time:" ,
changedStats.mtime);
console.log( "Changed Access Time:" ,
changedStats.atime);
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Step to run this program: Run index.js file using the following command:
node index.js
Output:
Details before changing time:
Modification Time: 2020-06-11T17:25:51.136Z
Access Time: 2020-06-11T16:50:51.223Z
Details after changing time:
Changed Modification Time: 2020-06-11T17:25:51.136Z
Changed Access Time: 2020-06-11T16:50:51.223Z
Reference: https://nodejs.org/api/fs.html#fs_fspromises_utimes_path_atime_mtime
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