datetime to_s(:option) not working

I added a migration to add a datetime object column to my database. It all works great, and I can edit it and everything using the select_date helper for forms.

BUT when I try to format the date using gallery.gallery_date.to_s (:short) I get an error:

"wrong number of arguments (1 for 0)"

How do I do this?

Shouldn't it be gallery_date.to_formatted_s(:short) ?