Yes, I run on a fresh OpenACS and probably I took code from HEAD. In 5-9 I saw it was fixed, sorry.
I was capable of adding my date attribute to the form, great! Now I would need to build some UI for my FormPage instances. For now I could stick with typical operations like list of objects, searchable by their attribute and CRUD operations.
CRUD is not a problem, but for listing I could use some advice. What is the recommended way to search a xowiki object by some user-defined attribute? I am trying to obtain the typical list with a form of filters aside (for now).