Add Month(s) to a Date in JavaScript or Node.js

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This tutorial shows you how to add one or more months to a date in JavaScript.

Node.js Series Overview

Add Month(s) to a Date in JavaScript

JavaScript comes with a Date class providing useful date handling. You can customize a date instance by adding the units you need. A date instance comes with .setX methods to customize it.

In this case, you want to add a given number of months to a date. Add the given amount of months to a date instance using date.setMonth(currentMonth + delay).

 * Returns the date with added `months` of delay.
 * @param {Number} months - the delay in months
 * @returns {Date}
function dateWithMonthsDelay (months) {  
  const date = new Date()
  date.setMonth(date.getMonth() + months)

  return date

Notice that date.setMonth directly changes the date instance.

A nice benefit of using this built-in method is that JavaScript takes care of switching the unit. For example, JavaScript also adjusts the years of your date instance if adding the months would exceed December. Sweet!

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