How to calculate ms since midnight in Javascript

Question

What is the best way to calculate the time passed since (last) midnight in ms?

Answer 1

A bunch of answers so here another:

var d = new Date(), e = new Date(d);
var msSinceMidnight = e - d.setHours(0,0,0,0);

As a function:

function getMsSinceMidnight(d) {
  var e = new Date(d);
  return d - e.setHours(0,0,0,0);
}

alert(getMsSinceMidnight(new Date()));