# Get the time difference between two datetimes

## Get the time difference between two datetimes

I know I can do anything and some more envolving Dates with momentjs. But embarrassingly, I’m having a hard time trying to do something that seems simple: geting the difference between 2 times.
Example:
var now = “04/09/2013 15:00:00”;
var then = “04/09/2013 14:20:30”;

//expected result:
“00:39:30”

what I tried:
var now = moment(“04/09/2013 15:00:00”);
var then = moment(“04/09/2013 14:20:30”);

console.log(moment(moment.duration(now.diff(then))).format(“hh:mm:ss”))
//outputs 10:39:30

I do not understand what is that “10” there. I live in Brazil, so we are utc-0300 if that is relevant.
The result of moment.duration(now.diff(then)) is a duration with the correct internal values:
days: 0
hours: 0
milliseconds: 0
minutes: 39
months: 0
seconds: 30
years: 0

So, I guess my question is: how to convert a momentjs Duration to a time interval? I sure can use
duration.get(“hours”) +”:”+ duration.get(“minutes”) +:+ duration.get(“seconds”)

but i feel that there is something more elegant that I am completely missing.
update
looking closer, in the above example now is:
Tue Apr 09 2013 15:00:00 GMT-0300 (E. South America Standard Time)…}

and moment(moment.duration(now.diff(then))) is:
Wed Dec 31 1969 22:39:30 GMT-0200 (E. South America Daylight Time)…}

I am not sure why the second value is in Daylight Time (-0200)… but I am sure that i do not like dates 🙁
update 2
well, the value is -0200 probably because 31/12/1969 was a date where the daylight time was being used… so thats that.

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## Solutions/Answers:

### Solution 1:

This approach will work ONLY when the total duration is less than 24 hours:

``````var now  = "04/09/2013 15:00:00";
var then = "04/09/2013 14:20:30";

moment.utc(moment(now,"DD/MM/YYYY HH:mm:ss").diff(moment(then,"DD/MM/YYYY HH:mm:ss"))).format("HH:mm:ss")

// outputs: "00:39:30"
``````

If you have 24 hours or more, the hours will reset to zero with the above approach, so it is not ideal.

If you want to get a valid response for durations of 24 hours or greater, then you’ll have to do something like this instead:

``````var now  = "04/09/2013 15:00:00";
var then = "02/09/2013 14:20:30";

var ms = moment(now,"DD/MM/YYYY HH:mm:ss").diff(moment(then,"DD/MM/YYYY HH:mm:ss"));
var d = moment.duration(ms);
var s = Math.floor(d.asHours()) + moment.utc(ms).format(":mm:ss");

// outputs: "48:39:30"
``````

Note that I’m using the utc time as a shortcut. You could pull out `d.minutes()` and `d.seconds()` separately, but you would also have to zeropad them.

This is necessary because the ability to format a `duration` objection is not currently in moment.js. It has been requested here. However, there is a third-party plugin called moment-duration-format that is specifically for this purpose:

``````var now  = "04/09/2013 15:00:00";
var then = "02/09/2013 14:20:30";

var ms = moment(now,"DD/MM/YYYY HH:mm:ss").diff(moment(then,"DD/MM/YYYY HH:mm:ss"));
var d = moment.duration(ms);
var s = d.format("hh:mm:ss");

// outputs: "48:39:30"
``````

### Solution 2:

Your problem is in passing the result of moment.duration() back into moment() before formatting it; this results in moment() interpreting it as a time relative to the Unix epoch.

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It doesn’t give you exactly the format you’re looking for, but

`moment.duration(now.diff(then)).humanize()`

would give you a useful format like “40 minutes”. If you’re really keen on that specific formatting, you’ll have to build a new string yourself. A cheap way would be

`[diff.asHours(), diff.minutes(), diff.seconds()].join(':')`

where `var diff = moment.duration(now.diff(then))`. This doesn’t give you the zero-padding on single digit values. For that, you might want to consider something like underscore.string – although it seems like a long way to go just for a few extra zeroes. 🙂

### Solution 3:

``````var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
a.diff(b, 'days') //[days, years, months, seconds, ...]
//Result 1
``````

Worked for me

### Solution 4:

If you want difference of two timestamp into total days,hours and minutes only, not in months and years .

``````var now  = "01/08/2016 15:00:00";
var then = "04/02/2016 14:20:30";
var diff = moment.duration(moment(then).diff(moment(now)));
``````

diff contains 2 months,23 days,23 hours and 20 minutes. But we need result only in days,hours and minutes so the simple solution is:

``````var days = parseInt(diff.asDays()); //84

var hours = parseInt(diff.asHours()); //2039 hours, but it gives total hours in given miliseconds which is not expacted.

hours = hours - days*24;  // 23 hours

var minutes = parseInt(diff.asMinutes()); //122360 minutes,but it gives total minutes in given miliseconds which is not expacted.

minutes = minutes - (days*24*60 + hours*60); //20 minutes.
``````

Final result will be : 84 days, 23 hours, 20 minutes.

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### Solution 5:

When you call `diff`, moment.js calculates the difference in milliseconds.
If the milliseconds is passed to `duration`, it is used to calculate duration which is correct.
However. when you pass the same milliseconds to the `moment()`, it calculates the date that is milliseconds from(after) epoch/unix time that is January 1, 1970 (midnight UTC/GMT).
That is why you get 1969 as the year together with wrong hour.

``````duration.get("hours") +":"+ duration.get("minutes") +":"+ duration.get("seconds")
``````

So, I think this is how you should do it since moment.js does not offer `format` function for duration. Or you can write a simple wrapper to make it easier/prettier.

### Solution 6:

If we want only hh:mm:ss, we can use a function like that:

``````//param: duration in milliseconds
MillisecondsToTime: function(duration) {
var seconds = parseInt((duration/1000)%60)
, minutes = parseInt((duration/(1000*60))%60)
, hours = parseInt((duration/(1000*60*60))%24)
, days  = parseInt(duration/(1000*60*60*24));

var hoursDays = parseInt(days*24);
hours += hoursDays;
hours = (hours < 10) ? "0" + hours : hours;
minutes = (minutes < 10) ? "0" + minutes : minutes;
seconds = (seconds < 10) ? "0" + seconds : seconds;
return hours + ":" + minutes + ":" + seconds;
}
``````
Posted on Categories Javascript