6

I'm trying to determine whether there are more than 7 days between two dates using moment.js.

code:

var start = moment(self.StartDate(), "DD/MM/YYYY");
var end = moment(self.EndDate(), "DD/MM/YYYY");

console.log(start);
console.log(end);
console.log(moment.duration(end.diff(start)).asDays());

if (moment.duration(end.diff(start)).asDays() > 7) {
    alertify.alert("Error", "Only a maximum of 7 days can be investigated.");
    return;
}

This works if the two dates are within the same month. However, if the dates cross over between 2 months the duration returns a negative value.

Example results:

enter image description here

Bhav
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  • end.diff(start, 'days') // gives you diferent in integer – Arshpreet Wadehra Jun 25 '19 at 08:54
  • You can use Math.abs() for absolute value – DSCH Jun 25 '19 at 08:54
  • Docs for [diff()](https://momentjs.com/docs/#/displaying/difference/). Also from the docs, on diff: "If you want a floating point number, pass true as the third argument." – Kobe Jun 25 '19 at 08:55
  • I'd just convert to epoch timestamp, and find the num seconds between the two, then divide to get days... https://jsfiddle.net/JS69L/1/ – Alicia Sykes Jun 25 '19 at 08:56
  • Possible duplicate of [How to calculate number of days between two dates](https://stackoverflow.com/questions/9129928/how-to-calculate-number-of-days-between-two-dates) – Kobe Jun 25 '19 at 08:58

5 Answers5

10

Use diff method to check difference between two days and add days as second parameter to get difference in days.

var d1 = "2019-01-10";
var d2 = "2019-01-20";
var diff = moment(d2).diff(d1, 'days')
alert('difference :' + diff)

alert('is difference more than 7: ' + (diff > 7))
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
Neel Bhanushali
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3

You can do:

const d1 = moment([2019, 6, 30]);
const d2 = moment([2019, 6, 1]);
const diffDays = d1.diff(d2, 'days');

console.log(diffDays);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
Yosvel Quintero
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0

With native JavaScript:

const dayInMiliseconds = 1000 * 60 * 60 * 24;
const self = {start: new Date(), end: new Date(new Date().setDate(new Date().getDate() + 7))}

console.log(Math.round((self.end - self.start) / dayInMiliseconds))
Ziv Ben-Or
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  • This really only works if the two dates are set to about the same time. E.g. the difference between 2019-06-23 06:00:00 and 2019-06-23 18:00:00 will resolve to 1 day, even though the difference is only 12 hours and both dates are on the same day. See [*How do I get the number of days between two dates in JavaScript?*](https://stackoverflow.com/questions/542938/how-do-i-get-the-number-of-days-between-two-dates-in-javascript) – RobG Jun 25 '19 at 09:46
  • If you want a day to be counted only if passed 24 hours, use `Math.floor` insted `Math.round` – Ziv Ben-Or Jun 25 '19 at 09:51
-1

try this

end.diff(start, "days") > 7

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

Ramil Amparo
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-2

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

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