Flex 时间跟java传值

<mx:FormItem label="达标时间">
<mx:DateField id="startDate"  selectableRange="{{rangeEnd:today}}"  width="130" dayNames="[日,一,二,三,四,五,六]" monthNames="[一,二,三,四,五,六,七,八,九,十,十一,十二]" formatString="YYYY-MM-DD" showToday="true"  />
  </mx:FormItem>  
var startDates:String=startDate.text;
java接收
private Date startDate;