app/views/spree/admin/reports/_unexported_order_criteria.html.erb
<%= search_form_for @search, url: spree.unexported_orders_admin_reports_path do |s| %>
<div class="field">
<%= label_tag :q_completed_at_gt, 'Since', class: 'inline' %>
<%= s.text_field :completed_at_gt, class: 'datepicker datepicker-from',
value: datepicker_field_value(params[:q][:completed_at_gt]) %>
</div>
<div class="actions filter-actions">
<%= button Spree.t(:search), 'search' %>
</div>
<% end %>