How to Add Months to a Date in JavaScript

1. Use the setMonth() and getMonth() Methods of the Date Object to Add Months to a Date in JavaScript
2. Use date.js to Add Months to a Date in JavaScript
3. Use the moment Library to Add Months to a Date in JavaScript

This tutorial will introduce some methods to add specific months to a date in JavaScript.

Use the setMonth() and getMonth() Methods of the Date Object to Add Months to a Date in JavaScript

We can use the combination of the setMonth() and getMonth() methods provided by the Date object to add a month to a date in JavaScript. The getMonth() method returns the month from the specified date.

The returned month is in zero-based value, which means the first month is denoted as 0. Similarly, the setMonth() method sets the specified months to a date.

We can use the functionality of these two methods together and add a specific number of months to a date. We can use the getMonth() method to get the current month, add the number of months and use the setMonth() method to set the new month.

Let’s add one month to the current date using these methods.

For example, get the current date using the Date object and store it in the date variable. Next, invoke getMonth() using the date object and 1.

Next, use this expression as a parameter to the setMonth() method. Invoke the setMonth() method with the date object.

Finally, set the whole expression as a parameter to a Date object. Print both dates.

Example Code:

var date = new Date();
console.log(date)
var newDate = new Date(date.setMonth(date.getMonth() + 1));
console.log(newDate)

Output:

2023-01-31T14:14:09.646Z
2023-03-03T14:14:09.646Z

The current date is 2023-01-31, and after 1 month is added, it becomes 2023-03-03. This way, we can use the setMonth() and getMonth() methods to add months to date in JavaScript.

Use date.js to Add Months to a Date in JavaScript

In JavaScript, we can also use the date.js package to add a specific number of months to a date. The package overrides the JavaScript Date object.

It provides a method add() through which we can specify the number to be added. Then, we can specify what is to be added by calling methods like month(), day(), etc.

Therefore, we can specify the number of months to be added in the add() method and then call the month() method.

First, install the package using the following command.

npm i datejs

For example, get the current date using the Date.today() method and store it in the currDate variable. After that, use the currDate variable to call the add() method and supply 1 as the parameter.

Next, invoke the month() method. Finally, print both dates.

Example Code:

require('datejs')

var currDate = Date.today();
console.log(currDate)
var newDate = currDate.add(1).month();
console.log(newDate)

Output:

2023-01-30T18:15:00.000Z
2023-02-27T18:15:00.000Z { _orient: 1 }

Instead of calling add(1).month(), you can also call the addMonths(1) method. It will yield the same result.

In JavaScript, we can use the date.js package to add a specific number of months to a date.

Use the moment Library to Add Months to a Date in JavaScript

The usage of moment is quite similar to date.js in terms of adding a month to a date in JavaScript.

The library provides the add() method, where we can set the number as the first parameter and the item in which the number is added as the second parameter. The second parameter is a string.

Install the library with the following command.

npm i moment

First, require the moment library and call the moment() method. Set a Date object as the parameter of the method.

Next, assign the expression to a currDate variable. This returns the current date.

Then, use the currDate variable to invoke the add() method. In the add() method, supply the first parameter as 1 and the second as "month". Finally, print both dates.

Example Code:

const moment = require('moment')
var currDate = moment(new Date());
console.log(currDate)
var newDate = currDate.add(1, 'month');
console.log(newDate)

Output:

Moment<2023-01-31T20:37:11+05:45>
Moment<2023-02-28T20:37:11+05:45>

In JavaScript, we can use the moment library to add a month to the date.