MomentJS - Add

This method allows you add days, time, years, hours, seconds etc., on the moment object.

Syntax

moment().add(Number, String);
moment().add(Object);
moment().add(Duration);

Using the add method we can add number, hours, days etc.

The following table shows the lists of keys/shorthand which you can use with add method.

Key	Shorthand
years	y
quarters	Q
months	M
weeks	w
days	d
hours	h
minutes	m
seconds	s
milliseconds	ms

You can make use of key or shorthand unit inside the add method as follows −

Example

moment.add(5, 'days'); or moment.add(5, 'd');

Let see a working example which shows to add days to the current date using add method.

Example

<html>
   <head>
      <title>MomentJS - ADD Method</title>
      <scrip type="text/JavaScript" src="https://MomentJS.com/downloads/moment.js"></script>
      <style>
         div { border: solid 1px #ccc;
            padding:10px;
            font-family: "Segoe UI",Arial,sans-serif;
            width: 75%;
         }
      </style>
   </head>
   <body>
      <h1>MomentJS - Add Method</h1>
      <div style="font-size:25px" id="currentdate"></div>
      <br/>
      <br/>
      <div style="font-size:25px" id="changeddate"></div>
      <script type="text/JavaScript">
         var day = moment(); //outputs current date.
         document.getElementById("currentdate").innerHTML = "Current Date: " + day._d;
         var changeddate = moment().add(5, 'days'); // adding 5 days to current date.
         document.getElementById("changeddate").innerHTML = "Output after adding 5 days: " + changeddate._d;
      </script>
   </body>
</html>

Output

Note that the above code displays the current date and the date after adding 5 days to it.

You can also use the key with add method as follows −

var changeddate = moment().add(5, 'days'); // adding 5 days to current date.

Example

Let see an example which adds 5 hours to the given date −

var changeddate = moment([2017, 2, 31]).add(5, 'hours');

Output

If there are multiple additions to be done to the date, you can do it using add method chaining or using object literal.

Add Method using Chaining

Consider you want to add days and months to the current date. It can be done using method chaining as shown in below example −

Example

var changeddate = moment().add(5, 'days').add(2, 'months');.

Output

To add days and months to the current date, we can use method chaining as follows −

var changeddate = moment().add(5, 'days').add(2, 'months');.

We can also use key as shown in the code given below −

var changeddate = moment().add(5, 'd').add(2, 'M');

Add Method using Object

Using this technique, you can use object literal for adding multiple keys to the current date.

Example

var changeddate = moment().add({ days: 5, months: 2 });

Output

The object method is used as follows −

var changeddate = moment().add({ days: 5, months: 2 });

You can also use keys in the object form as follows −

var changeddate = moment().add({ d: 5, M: 2 });

In case, we need to add days or months to a given date, the same can be done as shown below −

Example

var changeddate = moment([2014, 10, 10]).add({ d: 5, M: 2 });

Output

We have added 5 days and 2 months to the date 10/10/2014 which gives the output as 15/01/2015.

Adding Duration to Add Method

We can also use duration method to add days, months, years, time etc. to a given date.

Observe the following example that shows how to add 5 weeks to a given date using duration −

Example

var duration = moment.duration({ 'weeks': 5 });
var changeddate = moment([2012, 0, 31]).add(duration);

Note that we have added 5 weeks to 31/01/2012 and thus the output is as follows −

Output

Special Cases for Months and Years

In case we are trying to add months to the date whose days are greater than the months added, it will take the last day of the month which is added to the date.

Example

var changeddate = moment([2017, 0, 31]).add(1, 'months');

In the above example, we are adding one month to 31/01/2017, now since February has 28 days it takes the last day of February and displays the date as shown below −

Output

momentjs_manipulate_date_and_time.htm