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<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
<mx:Form>
 <mx:FormHeading label="Trip Calculator"/>
 <mx:FormItem label="Start Date">
  <mx:DateField id="startDate" change="update(event)"/>
 </mx:FormItem>
 <mx:FormItem label="End Date">
  <mx:DateChooser id="endDate" change="update(event)"/>
 </mx:FormItem>
 <mx:FormItem label="Trip Duration (days)">
  <mx:Label id="display"/>
 </mx:FormItem>
</mx:Form>
<mx:Script>
<![CDATA[
 import mx.events.CalendarLayoutChangeEvent;
 
 private static const MILLISECONDS:int = 1000;
 private static const SECONDS:int = 60;
 private static const MINUTES:int = 60;
 private static const HOURS:int = 24;
 
 private function update(evt:CalendarLayoutChangeEvent):void {
  try {
   var diff:Number = endDate.selectedDate.getTime()-startDate.selectedDate.getTime();
   // convert the millisecond into days
   var days:int = int(diff/(MILLISECONDS*SECONDS*MINUTES*HOURS));
   display.text = days.toString();
  }
  catch(ex:Error) {}
 }
]]>
</mx:Script>
</mx:Application>
 
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