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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.

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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!

Mentioned Resources

Marcus Pöhls

Marcus is a fullstack JS developer. He’s passionate about the hapi framework for Node.js and loves to build web apps and APIs. Creator of Futureflix and the “learn hapi” learning path.

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