Flex 4 utc日期时间格式问题

private function init_vars():void
            {
timeZoneOffset = FlexGlobals.topLevelApplication.parameters.clock_time_zone; // I load this with js
                timeZoneOffset = 5,50; // just for test
            }

            private function tick(event:TimerEvent):void 
            {                   
                var local: Date = new Date();

                var utc: Date = new Date(local.getTime() + (local.getTimezoneOffset() * 60000));

                var utcTime:Number=utc.getTime();




                var new_offset_date:Number = utcTime + ((3600000) * timeZoneOffset);
                var new_date:Date = new Date(new_offset_date);              
                currentTime = new Date(new_date);
                showTime(currentTime); // another function just to display time                                 
            } 


private function showTime(time:Date):void
            {
                seconds = time.getSeconds();
                minutes= time.getMinutes();
                hours= time.getHours();

                            //rotate
                this.secondsPointer.rotation = (seconds * 6) - 90;
                this.minutesPointer.rotation = (minutes * 6) - 90;              
                this.hoursPointer.rotation = (hours * 30) + (minutes * 0.5) - 90;
                this.secondsPointer.visible = true;
                this.minutesPointer.visible = true;
                this.hoursPointer.visible = true;                           
            }