Get difference between 2 dates in javascript

var date1 = new Date("11/04/2016");
var date2 = new Date("11/19/2016");
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); 
alert(diffDays);

change the format of date.

it should be MM/DD/YYYY

Hope this helps.

The easiest way is to use moment.js library:

var date1 = moment('04.11.2016', 'MM.DD.YYYY'),
    date2 = moment('19.11.2016', 'MM.DD.YYYY'),
    diffDays = date2.diff(date1, 'days'); // you can wrap it in Math.abs()

The ugly js way:

var input1 = '04.11.2016',
    parts1 = input1.split('.'),
    date1 = new Date(parts1[2], parts1[1], parts1[0]),
    input2 = '19.11.2016',
    parts2 = input2.split('.'),
    date2 = new Date(parts2[2], parts2[1], parts2[0]),
    timeDiff = Math.abs(date2.getTime() - date1.getTime()),
    diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));

Change the Month and Date order First should be month then date... MM/DD/YYYY

var date1 = new Date("11.04.2016");
var date2 = new Date("11.19.2016");
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); 
alert(diffDays);

Your second date is incorrect. Parser is considering this format MM.DD.YYY and you have supplied out of range month.

var date1 = new Date("04.11.2016");
var date2 = new Date("09.11.2016");
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); 
alert(diffDays);

A date consists of a year, a month, a day, an hour, a minute, a second, and milliseconds.

Date objects are created with the new Date() constructor.

There are 4 ways of initiating a date:

new Date() new Date(milliseconds) new Date(dateString) new Date(year, month, day, hours, minutes, seconds, milliseconds)

so you can split them and then use it

Just change the first two lines as below

var date1 = new Date(2016,11,4);
var date2 = new Date(2016,11,19);

new date("mm dd yyyy") format was wrong

(function () {
var date1 = new Date("11 04 2016");
var date2 = new Date("11 19 2016");
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); 
console.log(diffDays);
})()

JS expects date to in MM-DD-YYYY and not DD-MM-YYYY. Ideal way would be to use moment.js, but you can use something like this:

function createCustomDate(dateString){
  var dateArr = dateString.split(/[^0-9]/).reverse().join("-")
  return new Date(dateArr);
}

var dateStr1 = "04.11.2016";
var dateStr2 = "19.11.2016";
var date1 = createCustomDate(dateStr1);
var date2 = createCustomDate(dateStr2);
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); 
console.log(diffDays);

new Date("19.11.2016");

this is Invalid Date. So, difference is be NaN .

change the format to mm/dd/yyyy and it will work.

You can use moment.js,

d = moment('11.16.2016') // here date format was in "MM.DD.YYYY"
e = moment('11.04.2016') // here date format was in "MM.DD.YYYY"
getDiffbydays = e.diff(d,'days') // get diff by days you can use day
getDiffbyyears = e.diff(d,'year') // get diff by years you can use year 
getDiffbymonth = e.diff(d,'month') // get diff by months you can use month

Check this solution which uses a function called getDate to convert the date string of the format "04.11.2016" to a JavaScript Date object.

function getDate(dateStr) {
  var arr = dateStr.split('.');

  return new Date(arr[2], arr[1], arr[0]);
}

var start = getDate("04.11.2016");
var end = getDate("19.11.2016");
var timeDiff = Math.abs(end.getTime() - start.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 60 * 60 * 24))
console.log('Number of days: ' + diffDays);

In order to use this code to create a Custom JavaScript Variable in Google Tag Manager, you can modify the above code or the one which you choose to be inside a function - reference.