使用DateValidator判断用户输入的日期格式，并用DateFormatter对输入日期格式化。

示例：

代码：

<? xml version="1.0" encoding="utf-8" ?>
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"  viewSourceURL ="srcview/index.html" >

     < mx:Script >
         <![CDATA[

            import mx.events.ValidationResultEvent;
            private var vResult:ValidationResultEvent;

            // Event handler to validate and format input.
            private function Format():void
            {
                vResult = dateVal.validate();
                if (vResult.type==ValidationResultEvent.VALID) {
                    formattedDate.text=dateFormatter.format(dob.text);
                }

                else {
                    formattedDate.text= "";
                }
            }
         ]]>
     </ mx:Script >

     < mx:DateFormatter  id ="dateFormatter"  formatString ="mois: MM, jour: DD, année: YYYY" />

     < mx:DateValidator  id ="dateVal"  source =" {dob} "  property ="text"  inputFormat ="mm/dd/yyyy" />

     < mx:Panel  title ="Exemple de DateFormatter "  width ="95%"  height ="95%"
            paddingTop ="10"  paddingLeft ="5"  paddingRight ="5"  paddingBottom ="10" >

         < mx:Form  width ="100%" >
             < mx:FormItem  label ="Entrer une date (mm/dd/yyyy):"  width ="100%" >
                 < mx:TextInput  id ="dob"  text ="" />
             </ mx:FormItem >

             < mx:FormItem  label ="Date Formatée: "  width ="100%" >
                 < mx:TextInput  id ="formattedDate"  text =""  editable ="false" />
             </ mx:FormItem >

             < mx:FormItem >
                 < mx:Button  label ="Valider et Formater"  click ="Format();" />
             </ mx:FormItem >
         </ mx:Form >

     </ mx:Panel >
</ mx:Application >

点击查看源文件

来自： http://www.flex-tutorial.fr/2008/05/18/flex-formatter-exemple-de-dateformatter-en-mxml/