Syntax for the two flavors of field helpers

I’m using the following in a form_for, in order to display and edit
two activity_details in the same form as an activity.

  <% fields_for "activity_detail[]", @delivery do |detail| %>
          ...
          <%= detail.text_field 'start_mileage' %>
          ...
  <% end %>
  <% fields_for "activity_detail[]", @pickup do |detail| %>
          ...
          <%= detail.text_field 'end_mileage' %>
          ...
  <% end %>

It works like a charm. However, I’d now like to use Stuart R.'s
date kit helper to format and select some dates for each activity
detail.

e.g. <%= date_field(‘person’, ‘birthday’, :value => @person.birthday)
%>

My question is this: What arguments do I pass for this style (non-
member) of form helper in the context of an array of models in a
fields_for, as above?

Page 490 of AWDWR 2nd ed. gives a clue that it should be possible.
Their (very simple case) example goes like this:

<% form_for :user do |form| %>
Name: <%= text_field :user, :name %>

Any thoughts?

Thanks,
Brian

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