Moment.js Duration between Two Dates

Question

How do I get the time difference between two different dates variables, specifically in years, months and days using moment.js?

I found this method but I keep getting weird results. Sometimes the result is one month ahead so I added a subtract one months part to make the result correct, but when the difference between the two dates can be divided into whole years it then becomes a month behind, but then if I remove the subtract month part, it gets even more out of whack.

Also I would like to format it as "X Years, Y Months, Z days", but also can't figure out how to format it in such way.

 var dateOne = new Date(2000,07,16); var dateTwo = new Date (1990,07,16); var updatedDate = moment(dateOne).format('ll'); var x = moment(dateOne, 'DD/MM/YYYY').diff(moment(dateTwo, 'DD/MM/YYYY')) var y = moment.duration(x); var why = moment(x).subtract(1, 'M'); var z = Math.floor(y.asYears()) + moment.utc(why).format('/MM/DD'); console.log(z); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script> 

Answer 1

Try this perhaps?

var firstDate = moment();
var secondDate = moment("2018-03-19");
var yearDiff = firstDate.diff(secondDate, "year");
var monthDiff = firstDate.diff(secondDate, "month");
var dayDiff = firstDate.diff(secondDate, "day");
console.log(yearDiff + " Years, " + monthDiff + " Months, " + dayDiff + " Days");

https://jsfiddle.net/px1brLdk/

Answer 2

As stated by others in the comments, you can't format a duration as a date and since dateOne and dateTwo are a Date objects, there is no need for the second argument in moment(dateOne, 'DD/MM/YYYY') , simply use moment(Date) .

Moverover, please note that when you use new Date(year, monthIndex, day) monthIndex starts from 0, see MDN docs :

The argument monthIndex is 0-based. This means that January = 0 and December = 11 .

You can use moment-duration-format plug-in to format momentjs duration according your needs, see format() docs on the plug-in page .

Here a live sample:

 var dateOne = new Date(2000, 7, 16); var dateTwo = new Date(1990, 7, 16); var diff = moment(dateOne).diff(moment(dateTwo)) var dur = moment.duration(diff); var result = dur.format(); console.log(result); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/moment-duration-format/2.2.2/moment-duration-format.min.js"></script> 

Answer 3

Moment is having a method called .diff() Use that one. https://momentjs.com/docs/#/displaying/difference/