how to subtract two dates in moment js?

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To subtract two dates in moment js, just use the moment() and diff() method to subtract dates and get the difference in milliseconds ( You can specify your measurement unit like seconds, minutes, hours, days months, or years ).

Just import a moment in your file and use moment() to create a moment date after you can use the diff() method like the following example.

var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
a.diff(b) // 86400000

Today, I’m going to show How do I subtract two dates in moment js, here I will use the momentjs common method moment() to create the moment date object and the diff() method to get the difference.

Let’s start the today’s tutorial How do you subtract two dates in moment js?

Table of content

1. Installation
2. Example in reactjs

Installation

Use the below installation command as per your package manager, moment support npm, Yarn, NuGet, spm, and meteor.

npm install moment --save   # npm
yarn add moment             # Yarn
Install-Package Moment.js   # NuGet
spm install moment --save   # spm
meteor add momentjs:moment  # meteor

Example in reactjs

In the following example, we are going to do

1. import the moment package
2. example of 24-hour format time HH:mm:ss
3. example of 12-hour format time h:mm:ss a

let’s write the code.

import moment from "moment";

function subtractDates() {
    var date1 = moment('2016-10-08 10:29:23');
    var date2 = moment('2021-10-08 11:06:55');

    // milliseconds
    date2.diff(date1); // 157768652000
    
    // seconds
    console.log(date2.diff(date1, 'seconds')) // 157768652

    // minutes
    console.log(date2.diff(date1, 'minutes')) // 2629477

    // hours
    console.log(date2.diff(date1, 'hours')) // 43824

    // days
    console.log(date2.diff(date1, 'days')) // 1826

    // weeks
    console.log(date2.diff(date1, 'weeks')) // 260

    // months
    console.log(date2.diff(date1, 'months')) // 60

    // years
    console.log(date2.diff(date1, 'years')) // 5
}

function App() {
    subtractDates()
  return (
    <div>
        {/* example of 24 hour format time `HH:mm:ss` */}
        {moment().format("HH:mm:ss")}
    </div>
  );
}

export default App;

Note: By default, moment#diff will truncate the result to zero decimal places, returning an integer. If you want a floating point number, pass true as the third argument.

var a = moment([2008, 9]);
var b = moment([2007, 0]);
a.diff(b, 'years');       // 1
a.diff(b, 'years', true); // 1.75

In the above program, we call the moment() and diff() methods to subtract dates and get differences in years, months, weeks, days, hours, minutes, and seconds.

let’s check the output.

I hope it’s help you, All the best 👍.