Get hours difference between two dates in Moment Js

I’m able to get the difference between two dates using MomentJs as follows:
moment(end.diff(startTime)).format(“m[m] s[s]”)

However, I also want to display the hour when applicable (only when >= 60 minutes have passed).
However, when I try to retrieve the duration hours using the following:
var duration = moment.duration(end.diff(startTime));
var hours = duration.hours();

it is returning the current hour and not the number of hours between the two dates.
How do I get the difference in hours between two Moments?

Solutions/Answers:

Solution 1:

You were close. You just need to use the duration.asHours() method (see the docs).

var duration = moment.duration(end.diff(startTime));
var hours = duration.asHours();

Solution 2:

Following code block shows how to calculate the difference in number of days between two dates using MomentJS.

var now = moment(new Date()); //todays date
var end = moment("2015-12-1"); // another date
var duration = moment.duration(now.diff(end));
var days = duration.asDays();
console.log(days)

Solution 3:

Or you can do simply:

var a = moment('2016-06-06T21:03:55');//now
var b = moment('2016-05-06T20:03:55');

console.log(a.diff(b, 'minutes')) // 44700
console.log(a.diff(b, 'hours')) // 745
console.log(a.diff(b, 'days')) // 31
console.log(a.diff(b, 'weeks')) // 4

docs: here

Solution 4:

All you need to do is pass in hours as the second parameter to moments diff function.

var a = moment([21,30,00], "HH:mm:ss")
var b = moment([09,30,00], "HH:mm:ss")
a.diff(b, 'hours') // 12

Docs: https://momentjs.com/docs/#/displaying/difference/

Example:

const dateFormat = "YYYY-MM-DD HH:mm:ss";
// Get your start and end date/times
const rightNow = moment().format(dateFormat);
const thisTimeYesterday = moment().subtract(1, 'days').format(dateFormat);
// pass in hours as the second parameter to the diff function
const differenceInHours = moment(rightNow).diff(thisTimeYesterday, 'hours');

console.log(`${differenceInHours} hours have passed since this time yesterday`);

<script 
  src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js">
</script>

Solution 5:

There is a great moment method called fromNow() that will return the time from a specific time in nice human readable form, like this:

moment('2019-04-30T07:30:53.000Z').fromNow() // an hour ago || a day ago || 10 days ago

Or if you want that between two specific dates you can use:

var a = moment([2007, 0, 28]);
var b = moment([2007, 0, 29]);
a.from(b); // "a day ago"

Taken from the Docs:

Solution 6:

I know this is old, but here is a one liner solution:

const hourDiff = start.diff(end, "hours");

Where start and end are moment objects.

Enjoy!