Flash AS3 simple delta time

AS3 delta time

package 
{
	import flash.display.Stage;
	import flash.events.Event;
	import flash.utils.getTimer;
	/**
	 * ...
	 * @author ...
	 */
	public class Time 
	{
		static public var time:Number = 0;
		static public var delta:Number = 0;
		
		static public function init(stage:Stage = null):void {
			delta = time = 0;
			
			if (stage == null) {
				trace("Time", "delta won't update, no stage");
				return;
			}
			
			update();
			update();
			update();
			
			stage.addEventListener(Event.ENTER_FRAME, update);
		}
		
		static public function update(evt:Event = null):void {
			delta = (getTimer() - time) / 1000;
			time = getTimer();
			
			//Console.log("Time", "delta ? " + delta + ", time ? " + time);
		}
	}

}