Javascript: dec to hex + slicing

[Dkyndt]

Hi, I have this javascript that should work.

However, the output does not result in HEX numbers.

var inputValue =  1224277079131226000.0 the
var hex = inputValue.toString(16).toUpperCase();
  var hexsliced = hex.slice(0,-4);
result = '{"tag":"outputTag", "value":"'+ hexsliced + '"}';


I expect the output to be "10FD81845845"
Currently it results "1224277079131226"

Can youplease help me out further?