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/syncer.js

@@ -267,7 +267,7 @@ Synchronise a set of changes to the server
 */
 Syncer.prototype.syncToServer = function(changes) {
 	var self = this,
-		now = new Date(),
+		now = Date.now(),
 		filteredChanges = this.filterFn.call(this.wiki,function(callback) {
 			$tw.utils.each(changes,function(change,title) {
 				var tiddler = self.wiki.getTiddler(title);
@@ -371,7 +371,7 @@ Queue up a sync task. If there is already a pending task for the tiddler, just u
 */
 Syncer.prototype.enqueueSyncTask = function(task) {
 	var self = this,
-		now = new Date();
+		now = Date.now();
 	// Set the timestamps on this task
 	task.queueTime = now;
 	task.lastModificationTime = now;
@@ -474,7 +474,7 @@ Choose the next applicable task
 Syncer.prototype.chooseNextTask = function() {
 	var self = this,
 		candidateTask = null,
-		now = new Date();
+		now = Date.now();
 	// Select the best candidate task
 	$tw.utils.each(this.taskQueue,function(task,title) {
 		// Exclude the task if there's one of the same name in progress

core/modules/utils/dom/scroller.js

@@ -57,7 +57,7 @@ PageScroller.prototype.scrollIntoView = function(element) {
 	var duration = $tw.utils.getAnimationDuration();
 	// Now get ready to scroll the body
 	this.cancelScroll();
-	this.startTime = new Date();
+	this.startTime = Date.now();
 	var scrollPosition = $tw.utils.getScrollPosition();
 	// Get the client bounds of the element and adjust by the scroll position
 	var clientBounds = element.getBoundingClientRect(),
@@ -94,7 +94,7 @@ PageScroller.prototype.scrollIntoView = function(element) {
 			if(duration <= 0) {
 				t = 1;
 			} else {
-				t = ((new Date()) - self.startTime) / duration;	
+				t = ((Date.now()) - self.startTime) / duration;	
 			}
 			if(t >= 1) {
 				self.cancelScroll();

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;

core/modules/widgets/scrollable.js

@@ -68,7 +68,7 @@ Scroll an element into view
 ScrollableWidget.prototype.scrollIntoView = function(element) {
 	var duration = $tw.utils.getAnimationDuration();
 	this.cancelScroll();
-	this.startTime = new Date();
+	this.startTime = Date.now();
 	var scrollPosition = {
 		x: this.outerDomNode.scrollLeft,
 		y: this.outerDomNode.scrollTop
@@ -112,7 +112,7 @@ ScrollableWidget.prototype.scrollIntoView = function(element) {
 			if(duration <= 0) {
 				t = 1;
 			} else {
-				t = ((new Date()) - self.startTime) / duration;	
+				t = ((Date.now()) - self.startTime) / duration;	
 			}
 			if(t >= 1) {
 				self.cancelScroll();