Use Date.now() instead of new Date()

Just for when what we actually want is a millisecond counter.

Interesting video about this:

https://www.youtube.com/watch?v=Vo72W1HWeFI

core/modules/utils/utils.js

@@ -475,7 +475,7 @@ exports.timer = function(base) {
 	} else if(window.performance) {
 		m = performance.now();
 	} else {
-		m = new Date();
+		m = Date.now();
 	}
 	if(typeof base !== "undefined") {
 		m = m - base;