I have two dates that I get in the following format - that are returned from a web service:
var dateone = "2016-08-21T07:00:00.000Z";
var datetwo = "2016-08-28T07:00:00.000Z";
var datediff = datetwo - dateone;
var numdays = Math.round(datediff);
console.log("Number of Days is " + numdays);
I get NaN. What am I missing here?
Your dateone and datetwo variables are Strings not Dates.
Try this:
var dateone = new Date("2016-08-21T07:00:00.000Z");
var datetwo = new Date("2016-08-28T07:00:00.000Z");
Also, substracting 2 Dates objects will give you the difference between them in milliseconds, if you want to determine the number of days, you can do something like this:
var dayDif = (datetwo - dateone) / 1000 / 60 / 60 / 24;
You can easily do with moment.js
var a = moment('2016-08-21T07:00:00.000Z');
var b = moment('2016-08-28T07:00:00.000Z');
var days = b.diff(a, 'days');
let invitedDate = '2019-11-27T05:19:23.32';
let deference = new Date().getTime() - new Date(invitedDate).getTime();
let days = Math.round(Math.abs(deference / (1000 * 60 * 60 * 24)));
if you need to get the deference between 2 different days what can do is, get using Date.getTime() and the invited Date example as above calculate the Days
As well as what Titus said about turning them into Dates rather than Strings, try something like this:
var oneDay = 24*60*60*1000; // Calculates milliseconds in a day
var diffDays = Math.abs((dateone.getTime() - datetwo.getTime())/(oneDay));
I don't know what you expected Math.round() to do for you, but I don't see that helping much. Math.abs() ensures that the difference is positive, while subtracting the two getTime() functions gets the difference in milliseconds.
Hope this helps.
