Add years to a date in JavaScript

The setFullYear() and getFullYear() methods of the Date object can be used to increment or decrement years from a date in JavaScript.

The following example demonstrates how you can add one year to the current date:

const today = new Date()
const nextYear = new Date()

// Add 1 Year
nextYear.setFullYear(today.getFullYear() + 1)

You can also update the existing JavaScript Date object as shown below:

const date = new Date()
date.setFullYear(date.getFullYear() + 1)

To subtract years from a date in JavaScript, simply minus the number of years when updating the date with the setFullYear() method:

const today = new Date()
const lastYear = new Date()

// Minus 1 Year
lastYear.setFullYear(today.getFullYear() - 1)

Finally, if you are frequently manipulating dates in JavaScript, add a function to Date’s prototype and call it directly whenever you want to add or subtract years:

Date.prototype.addYears = function (years) {
  const date = new Date(this.valueOf())
  date.setFullYear(date.getFullYear() + years)
  return date
}

// Add 1 Year
const nextYear = new Date(2022, 10, 15)

console.log(nextYear.addYears(1))
// Wed Nov 15 2023 00:00:00 GMT+0500 (Pakistan Standard Time)

// Minus 1 Year
const lastYear = new Date(2022, 10, 15)

console.log(lastYear.addYears(-1))
// Mon Nov 15 2021 00:00:00 GMT+0500 (Pakistan Standard Time)