Calculate timespan in JavaScript

Question

I have a .net 2.0 ascx control with a start time and end time textboxes. The data is as follows:

txtStart.Text = 09/19/2008 07:00:00

txtEnd.Text = 09/19/200

Answer 1

The answers above all assume string manipulation. Here's a solution that works with pure date objects:

var start = new Date().getTime();
window.setTimeout(function(){
  var diff = new Date(new Date().getTime() - start);
  // this will log 0 hours, 0 minutes, 1 second
  console.log(diff.getHours(), diff.getMinutes(),diff.getSeconds());
},1000);