CLDC-1402: Implement desired copy for start date q

adds an override method for the date example

app/helpers/collection_time_helper.rb

@@ -16,10 +16,13 @@ module CollectionTimeHelper
     Time.zone.local(collection_start_year_for_date(date), 4, 1)
   end
 
-  def date_mid_collection_year_formatted(date)
+  def date_mid_collection_year(date)
     relevant_year = date.nil? ? current_collection_start_year : collection_start_year_for_date(date)
-    example_date = Date.new(relevant_year, 9, 13)
-    example_date.to_formatted_s(:govuk_date_number_month)
+    Date.new(relevant_year, 9, 13)
+  end
+
+  def date_mid_collection_year_formatted(date)
+    date_mid_collection_year(date).to_formatted_s(:govuk_date_number_month)
   end
 
   def current_collection_start_date

app/helpers/form_page_helper.rb

@@ -1,4 +1,6 @@
 module FormPageHelper
+  include CollectionTimeHelper
+
   def action_href(log, page_id, referrer = "check_answers")
     send("#{log.log_type}_#{page_id}_path", log, referrer:)
   end
@@ -46,4 +48,11 @@ module FormPageHelper
       page.skip_href(log) || send(log.form.next_page_redirect_path(page, log, current_user, ignore_answered: true), log)
     end
   end
+
+  def date_hint(question, log)
+    [
+      question.hint_text.presence,
+      question.date_example_override(log) || "For example, #{date_mid_collection_year_formatted(log.startdate).tr(' ', '/')}",
+    ].compact.join("<br><br>").html_safe
+  end
 end

app/models/form/lettings/questions/tenancy_start_date.rb

@@ -1,4 +1,6 @@
 class Form::Lettings::Questions::TenancyStartDate < ::Form::Question
+  include CollectionTimeHelper
+
   def initialize(id, hsh, page)
     super
     @id = "startdate"
@@ -7,5 +9,16 @@ class Form::Lettings::Questions::TenancyStartDate < ::Form::Question
     @question_number = QUESTION_NUMBER_FROM_YEAR[form.start_date.year] || QUESTION_NUMBER_FROM_YEAR[QUESTION_NUMBER_FROM_YEAR.keys.max] if form.start_date.present?
   end
 
+  def date_example_override(log)
+    return unless form.start_year_2026_or_later?
+
+    example_date =
+      [date_mid_collection_year(log.startdate), Time.zone.today + 7]
+        .min
+        .to_formatted_s(:govuk_date_number_month)
+        .tr(" ", "/")
+    I18n.t("forms.#{form.start_date.year}.#{copy_key}.example", default: "", example_date:)
+  end
+
   QUESTION_NUMBER_FROM_YEAR = { 2023 => 5, 2024 => 7 }.freeze
 end

app/models/form/question.rb

@@ -299,6 +299,11 @@ class Form::Question
     answer_options.keys.reject { |x| x.match(/divider/) }
   end
 
+  # used by date questions that need bespoke formatting for the example date
+  def date_example_override(_log)
+    nil
+  end
+
 private
 
   def selected_answer_option_is_derived?(log)

app/views/form/_date_question.html.erb

@@ -6,7 +6,7 @@
           question_id: question.id,
           legend: { text: legend[:text], size: legend[:size], caption: caption(caption_text, page_header, conditional) },
           resource_type: @log.log_type,
-          hint: (question.hint_text.blank? ? "" : (question.hint_text.html_safe + "</br></br>".html_safe)) + "For example, #{date_mid_collection_year_formatted(@log.startdate).tr(' ', '/')}",
+          hint: date_hint(question, @log),
           f:,
         } %>
 

config/locales/forms/2026/lettings/setup.en.yml

@@ -64,6 +64,7 @@ en:
             check_answer_label: "Tenancy start date"
             check_answer_prompt: ""
             hint_text: "The tenancy start date can be up to 14 days from today. If your tenancy starts more than 14 days into the future, please wait until you are within 14 days of the start date before submitting your log. <br><br>If you’re answering this question on 1 April, you can enter a tenancy start date up to and including 15 April."
+            example: "Enter the date in the format DD/MM/YYYY, for example %{example_date}."
             question_text: "What is the tenancy start date?"
 
           rent_type: