calculate difference between two times in moment js

Question

I'm writing a service in node js. I have used moment js for time related solutions. I want to calculate the time difference between two times. Here is my snippet and it's not giving me the desired output :

var now = moment('11:08:30',"H:mm:ss");
var prev = moment('11:07:30', "H:mm:ss");
var result = moment(now.diff(prev)).format("H:mm:ss");
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.4.0/moment.min.js"></script>

As per my understanding, I think the difference between 11:08:30 and 11:07:30 should come out as 00:01:00 but instead the output is coming as 5:31:00. I don't understand why this is happening. How do I fix it so that the output is 00:01:00 i.e 1 minute ?

`now.diff(prev)` returns the difference in milliseconds, in your case `60000`. With `moment(60000)` you create a date `60000` milliseconds since 1 January 1970 UTC. If you now call `.format("H:mm:ss")` then `H` would be influenced by the timezone of your system. So you need to ensure that you work with utc while formatting. — t.niese, Nov 29 '18 at 06:36
So just change `moment(now.diff(prev)).format("H:mm:ss")` to `moment.utc(now.diff(prev)).format("H:mm:ss")`as described in this [answer](https://stackoverflow.com/a/29747198/1960455) and you have the output `0:01:00` — t.niese, Nov 29 '18 at 06:43

siddharth shah · Answer 1 · 2018-11-29T06:56:24.117

1

This is a working example,

var now = moment('11:08:30',"H:mm:ss");
var prev = moment('11:07:30', "H:mm:ss");

 function dateDifference(startDate, endDate){
        return moment(startDate).diff(moment(endDate), 'seconds');
    }
    console.log(this.dateDifference(now,prev))

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.4.0/moment.min.js"></script>

The supported measurements are years, months, weeks, days, hours, minutes, and seconds. For ease of development, the singular forms are supported as of 2.0.0. Units of measurement other than milliseconds are available in version 1.1.1.

Now, once u get answer in seconds, then please follow this link to convert seconds into your desired format 'h:mm:ss'

format seconds into 'hh:mm:ss'

edited Nov 29 '18 at 06:56

answered Nov 29 '18 at 06:20

siddharth shah

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it's throwing error in the console – node_man Nov 29 '18 at 06:27
"Uncaught SyntaxError: Unexpected token :" – node_man Nov 29 '18 at 06:27
If you post a snippet then check if it really runs. And the question is about javascript and not TypeScript. – t.niese Nov 29 '18 at 06:28
Updated the code please check again. working fine, let me know if u have any doubs – siddharth shah Nov 29 '18 at 06:34
The OP is asking how to correct the code so that it is `00:01:00` and not `01:01:00`, your code outputs `1`. – t.niese Nov 29 '18 at 06:37
@t.niese I'll make sure that in future posted sinepets work perfectly. – siddharth shah Nov 29 '18 at 06:38
yes please how to output it as H:mm:ss would be really helpful – node_man Nov 29 '18 at 06:39
@t.niese current version of moment.js does not support that particular format please check out my full answer. – siddharth shah Nov 29 '18 at 06:39
@pravinnavle to display in that format what you can do is, calculate the difference in 'seconds' format and then convert it into 'hh:mm:ss'. I hope this was helpful – siddharth shah Nov 29 '18 at 06:45
@siddharthshah That's what the OP is doing right now. `now.diff(prev)` returns `60000` and then the OP does `.format("H:mm:ss")` which results in `1:01:00` instead of the expected `0:01:00`. – t.niese Nov 29 '18 at 06:46
@pravinnavle if you still have any confusion then let me know, I'll add that calculation for format into the snippet also. Thanks. – siddharth shah Nov 29 '18 at 06:48
@t.niese then he has to calculate the difference in 'seconds' format and then convert it into 'hh:mm:ss'. – siddharth shah Nov 29 '18 at 06:50
@pravinnavle I've updated the answer please check. – siddharth shah Nov 29 '18 at 06:57

calculate difference between two times in moment js

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