JavaScript - add days to date

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In this article, we would like to show you how to add days to date in JavaScript.

1.  Example reusable lambda function

In this example, we create a simple function that takes two arguments:

  • date to which we want to add some days,
  • days - a number of days we want to add.

Runnable example:

// ONLINE-RUNNER:browser;

const addDays = (date, days) => {
  let result = new Date(date);
  result.setDate(result.getDate() + days);
  return result;

let date = new Date('2021-08-30T23:59:59.000Z');
let result = addDays(date, 1);

console.log(result.toISOString());  // 2021-08-31T23:59:59.000Z

2. Extending existing Date class with Date.prototype

In this example, we add a function to the Date.prototype so we can use it on any date object.

// ONLINE-RUNNER:browser;

Date.prototype.addDays = function (days) {
  let date = new Date(this.valueOf());
  date.setDate(date.getDate() + days);
  return date;

let date = new Date('2021-08-30T23:59:59.000Z');
let result = date.addDays(1)

console.log(result.toISOString());  // 2021-08-31T23:59:59.000Z
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