long date range in javascript

I am going to build a timeline with drag-n-drop functionality. Drag-n-drop works fine for me in IE, Chrome, FF and Safari. Now for a timeline there is a range from -15x10^9 to 15x10^9. I've tried to customize timeline.js and d3.js to fit this range. But after 10^6 it gives an error of NaN.

Below is the code to test the max value in moment.js and it prints NaN on console.

var iso_date = new Date(15000).toISOString();



 console.log(':::iso_date:::',iso_date); //1969-07-11T09:20:00.000Z




 var string_date = new Date(-15000000000).toString();

 console.log(':::string_date:::',string_date); //Fri Jul 11 1969 14:50:00 GMT+0530 (India Standard Time)

How do I accommodate this range in javascript and display it on a timeline ?????

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