[How to get a value of an attribute using TweenMax]

I have animated an element's attribute using TweenMax like this:

TweenMax.to($(".element"), 2, { rotation : 180 });

Later on, I need to get the value of the rotation, is it possible? Something like this:

TweenMax.getValue($(".element"), "rotation"); // just an example

How can I get the value of an attribute animated by TweenMax?