Moment.js isLeapYear() Function

It is used to check whether the given year is Leap Year or not in Moment.js using the isLeapYear() function that returns true if that year is a leap year and false if it is not. 

Syntax:

moment().isLeapYear();

Parameter: No parameters are required. 

Returns: True or False Installation of moment module:

You can visit the link to the Install moment module. You can install this package by using this command.

npm install moment

After installing the moment module, you can check your moment version in the command prompt using the command.

npm version moment

After that, you can just create a folder and add a file, for example, index.js. To run this file you need to run the following command.

node index.js

Project Structure:

Example 1: Filename: index.js

javascript

// Requiring module
const moment = require('moment');

let bool1 = moment([2000]).isLeapYear() // true
console.log(bool1);

Steps to run the program:

Make sure you have installed the moment module using the following command:

npm install moment

Run the index.js file using the below command:

node index.js

Output:

true

Example 2: Filename: index.js

javascript

// Requiring module
const moment = require('moment');

function checkLeapYear(year){
   return moment([year]).isLeapYear();
}

let bool = checkLeapYear(2001)
console.log(bool);

Steps to run the program:

Run the index.js file using the below command:

node index.js

Output:

false

Reference: https://momentjs.com/docs/#/query/is-leap-year/