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Check if selected date is null

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>                  import mx.events.CalendarLayoutChangeEvent;         private function useDate(eventObj:CalendarLayoutChangeEvent):void {             if (eventObj.currentTarget.selectedDate == null) {                 return             }             day.text = eventObj.currentTarget.selectedDate.getDay();             date.text = eventObj.currentTarget.selectedDate.getDate();             month.text = eventObj.currentTarget.selectedDate.getMonth();             year.text = eventObj.currentTarget.selectedDate.getFullYear();             wholeDate.text = eventObj.currentTarget.selectedDate.getFullYear() +"/" +(eventObj.currentTarget.selectedDate.getMonth()+1) + "/" + eventObj.currentTarget.selectedDate.getDate();         }            </mx:Script>     <mx:DateChooser id="date1" change="useDate(event)" />     <mx:Form>         <mx:FormItem label="Day">             <mx:TextInput id="day" width="100" />         </mx:FormItem>         <mx:FormItem label="Day of month">             <mx:TextInput id="date" width="100" />         </mx:FormItem>         <mx:FormItem label="Month">             <mx:TextInput id="month" width="100" />         </mx:FormItem>         <mx:FormItem label="Year">             <mx:TextInput id="year" width="100" />         </mx:FormItem>         <mx:FormItem label="Date">             <mx:TextInput id="wholeDate" width="300" />         </mx:FormItem>     </mx:Form> </mx:Application>