How to return data type "Date" using AMFPHP

Question

So, I cannot for the life of me manage to map a DateTime PHP class into an ActionScript Date class. I need to return Date using AMFPHP. For example:

<?php
class Foo {  
  public $id; // int
  public $name; // string
  public $date; // DateTime
  public $bar; // custom object
}
?>

should go to --->

package {
  class Foo {
    public var id:int;
    public var name:String;
    public var date:Date; // native class
    public var bar:Bar;
  }
}

but I am getting

package {
  class Foo {
    public var id:int;
    public var name:String;
    public var date:Object;
    public var bar:Bar;
  }
}

I do not think someone here still uses this old stuff, but I guess it is worth a try. Thank you.