is there a way to use any class as property type in @property ?

Is there a way to 'cheat' in phpstorms autocomplete to force it to see non-standard PHP types as magic properties?

for example:

/**
* @property $title string
* @property $content string
* @property $postdate DateTime
**/

    class Article {

...
...

     }


somewhere outside the class I want to do the following and get PHPStorm to recognise postdate as a DateTime object for auto-complete:

$a = new Article();
$a->postdate->

is this possible somehow? It is important that the property must remain magic and not public (since I can't intercept setting a public property for validation).