class ActionView::Helpers::FormBuilder

Please refer to the documentation of the base helper for details.

<% end %>
<%= f.submit %>
<%= f.date_select :birth_date %>
<%= form_for @person do |f| %>

Wraps ActionView::Helpers::DateHelper#date_select for form builders:

def date_select(method, options = {}, html_options = {})
  @template.date_select(@object_name, method, objectify_options(options), html_options)
end