create method to test whether we are currently in the crossover period and associated tests

app/helpers/collection_time_helper.rb

@@ -44,4 +44,16 @@ module CollectionTimeHelper
   def previous_collection_start_date
     current_collection_start_date - 1.year
   end
+
+  def currently_crossover_period?
+    # generally the crossover period ends on the first Friday in June, but there may be arbitrary exceptions such as in 2023
+    today = Time.zone.today
+    if today.year == 2023
+      today.between?(Time.zone.local(2023, 4, 1).to_date, Time.zone.local(2023, 6, 9).to_date)
+    else
+      crossover_end_date = Time.zone.local(today.year, 6, 1).to_date
+      crossover_end_date += 1 until crossover_end_date.friday?
+      today.between?(Time.zone.local(today.year, 4, 1).to_date, crossover_end_date)
+    end
+  end
 end

spec/helpers/collection_time_helper_spec.rb

@@ -109,4 +109,64 @@ RSpec.describe CollectionTimeHelper do
       end
     end
   end
+
+  describe "#currently_crossover_period?", focus: true do
+    subject(:result) { currently_crossover_period? }
+
+    around do |example|
+      Timecop.freeze(now) do
+        example.run
+      end
+    end
+
+    context "when it is January" do
+      let(:now) { Time.utc(2022, 1, 3) }
+
+      it "returns false" do
+        expect(result).to be false
+      end
+    end
+
+    context "when it is December" do
+      let(:now) { Time.utc(2020, 12, 3) }
+
+      it "returns false" do
+        expect(result).to be false
+      end
+    end
+
+    context "when it is April" do
+      let(:now) { Time.utc(2023, 4, 3) }
+
+      it "returns true" do
+        expect(result).to be true
+      end
+    end
+
+    context "when it is June" do
+      context "and it is the first Friday" do
+        let(:now) { Time.utc(2024, 6, 7) }
+
+        it "returns true" do
+          expect(result).to be true
+        end
+      end
+
+      context "and it is after the first Friday" do
+        let(:now) { Time.utc(2024, 6, 8) }
+
+        it "returns false" do
+          expect(result).to be false
+        end
+      end
+
+      context "and it is 2023, after the first Friday, but before the arbitrary crossover period end" do
+        let(:now) { Time.utc(2023, 6, 7) }
+
+        it "returns true" do
+          expect(result).to be true
+        end
+      end
+    end
+  end
 end