How to add days to a date in JavaScript

In this short article, we will show you how to add days to a date in JavaScript. Here, we will add the number of days to the given date using JavaScript.

We can also use the third party library such as Moment.js to manage the date object.

Function

Let’s use the following function to add the number of days to a date using JavaScript.

function addDaysToDate(date, days) {
  var dt = new Date(date);
  dt.setDate(dt.getDate() + days);
  return dt;
}

var currentDate = new Date(); // currentDate.toLocaleDateString() - 2/4/2021
addDaysToDate(currentDate, 2).toLocaleDateString(); // 2/6/2021

var dt1 = new Date('09/02/2021'); // dt1.toLocaleDateString() - 9/2/2021
addDaysToDate(dt1, 5).toLocaleDateString(); // 9/7/2021

Create prototype

We can simply develop a prototype for a date for simple access using the same code described previously.

Date.prototype.addDays = function(days) {
  var dt = new Date(this.valueOf());
  dt.setDate(dt.getDate() + days);
  return dt;
};

var currentDate = new Date(); // currentDate.toLocaleDateString() - 2/4/2021
currentDate.addDays(2).toLocaleDateString(); // 2/6/2021

var dt1 = new Date("09/02/2021"); // dt1.toLocaleDateString() - 9/2/2021
dt1.addDays(5).toLocaleDateString(); // 9/7/2021

That’s all I’ve got for today.
Thank you for reading. Happy Coding..!!