Simple question about Helpers

[eluser]russ_kern[/eluser]
In the Users Guide it says about Helpers:

"... Once loaded, it becomes globally available in your controller and views."

What about your models? Are they globally available there as well?

If I have Called the Date Helper in my Controller, but a model needs that functionality, do I need to recall it within the model? Or since I called it in the Controller is it automatically available?

Thanks in advance... Russ