JavaScript new Date() Returning NaN in IE, Safari

I am using highcharts to draw charts and parsing the date with new Date() function. In Chrome and FF, date is parsing fine.

But in IE and Safari, i am getting NaN and Invalid date format resp.

Below is the data i am getting from backend in (element.x) array

2016, 04,05
2016, 04,06
2016, 04,07
2016, 04,08
2016, 04,09
2016, 04,10

Now, i am converting it to Date object in JavaScript as below:

//Loop starts
var xAxis = new Date(element.x);
datas.push([Date.UTC(xAxis.getUTCFullYear(),xAxis.getUTCMonth(), xAxis.getUTCDate())]);
//Loop ends

Now, this operation retus NaN in IE but works very well in chrome as below:

Chrome

Array([0]=>140004454) - Unix Time stamp i get

IE

Array([0]=>NaN)