diff --git a/app/helpers/collection_time_helper.rb b/app/helpers/collection_time_helper.rb
index acd56378b..5b356772f 100644
--- a/app/helpers/collection_time_helper.rb
+++ b/app/helpers/collection_time_helper.rb
@@ -53,4 +53,10 @@ module CollectionTimeHelper
   def archived_collection_start_year
     current_collection_start_year - 2
   end
+
+  def generate_different_date_within_collection_year(date, start_date_override = nil, end_date_override = nil)
+    start_date = start_date_override || collection_start_date(date).to_date
+    end_date = end_date_override || collection_end_date(date).to_date
+    ((start_date..end_date).to_a - [date.to_date]).sample
+  end
 end
diff --git a/spec/helpers/merge_requests_helper_spec.rb b/spec/helpers/merge_requests_helper_spec.rb
index db0598489..8b36a2f70 100644
--- a/spec/helpers/merge_requests_helper_spec.rb
+++ b/spec/helpers/merge_requests_helper_spec.rb
@@ -1,6 +1,8 @@
 require "rails_helper"
 
 RSpec.describe MergeRequestsHelper do
+  include CollectionTimeHelper
+
   describe "#merging_organisations_without_users_text" do
     context "with 1 organisation" do
       let(:organisation) { build(:organisation, name: "Org 1") }
@@ -163,7 +165,7 @@ RSpec.describe MergeRequestsHelper do
     let(:organisation) { create(:organisation, name: "Org 1") }
     let(:merging_organisation) { create(:organisation, name: "Org 2") }
     let(:merging_organisation_2) { create(:organisation, name: "Org 3") }
-    let(:merge_request) { create(:merge_request, absorbing_organisation: organisation, merge_date: Time.zone.today) }
+    let(:merge_request) { create(:merge_request, absorbing_organisation: organisation, merge_date: Time.zone.today - 2.days) }
 
     before do
       create(:merge_request_organisation, merge_request:, merging_organisation:)
@@ -198,10 +200,10 @@ RSpec.describe MergeRequestsHelper do
     context "when merging organisations have logs" do
       before do
         create(:lettings_log, owning_organisation: organisation)
-        create(:lettings_log, owning_organisation: merging_organisation, startdate: Time.zone.tomorrow)
+        create(:lettings_log, owning_organisation: merging_organisation, startdate: generate_different_date_within_collection_year(Time.zone.yesterday, Time.zone.today - 2.days))
         create(:lettings_log, owning_organisation: merging_organisation, startdate: Time.zone.yesterday)
         create(:sales_log, owning_organisation: organisation)
-        create(:sales_log, owning_organisation: merging_organisation, saledate: Time.zone.tomorrow)
+        create(:sales_log, owning_organisation: merging_organisation, saledate: generate_different_date_within_collection_year(Time.zone.yesterday, Time.zone.today - 2.days))
         create(:sales_log, owning_organisation: merging_organisation, saledate: Time.zone.yesterday)
       end
 
@@ -235,8 +237,8 @@ RSpec.describe MergeRequestsHelper do
         before do
           create(:organisation_relationship, parent_organisation: merging_organisation_2, child_organisation: merging_organisation)
           create(:merge_request_organisation, merge_request:, merging_organisation: merging_organisation_2)
-          create(:lettings_log, assigned_to: merging_organisation_2.users.first, owning_organisation: merging_organisation_2, managing_organisation: merging_organisation, startdate: Time.zone.yesterday)
-          create(:sales_log, assigned_to: merging_organisation_2.users.first, owning_organisation: merging_organisation_2, managing_organisation: merging_organisation, saledate: Time.zone.yesterday)
+          create(:lettings_log, assigned_to: merging_organisation_2.users.first, owning_organisation: merging_organisation_2, managing_organisation: merging_organisation, startdate: generate_different_date_within_collection_year(Time.zone.yesterday, Time.zone.today - 2.days))
+          create(:sales_log, assigned_to: merging_organisation_2.users.first, owning_organisation: merging_organisation_2, managing_organisation: merging_organisation, saledate: generate_different_date_within_collection_year(Time.zone.yesterday, Time.zone.today - 2.days))
         end
 
         it "returns the correct merging_organisations_lettings_logs_outcomes_text text" do
diff --git a/spec/models/sales_log_spec.rb b/spec/models/sales_log_spec.rb
index 442febddb..8fe540efe 100644
--- a/spec/models/sales_log_spec.rb
+++ b/spec/models/sales_log_spec.rb
@@ -3,6 +3,8 @@ require "shared/shared_log_examples"
 
 # rubocop:disable RSpec/MessageChain
 RSpec.describe SalesLog, type: :model do
+  include CollectionTimeHelper
+
   let(:owning_organisation) { create(:organisation) }
   let(:assigned_to_user) { create(:user) }
 
@@ -250,7 +252,7 @@ RSpec.describe SalesLog, type: :model do
     end
 
     context "when there is a log with a different sale date" do
-      let!(:different_sale_date_log) { create(:sales_log, :duplicate, saledate: Time.zone.tomorrow, owning_organisation: organisation) }
+      let!(:different_sale_date_log) { create(:sales_log, :duplicate, saledate: generate_different_date_within_collection_year(Time.zone.now), owning_organisation: organisation) }
 
       it "does not return a log with a different sale date as a duplicate" do
         expect(described_class.duplicate_logs(log)).not_to include(different_sale_date_log)
@@ -376,7 +378,7 @@ RSpec.describe SalesLog, type: :model do
 
     context "when there is a log with a different sale date" do
       before do
-        create(:sales_log, :duplicate, saledate: Time.zone.tomorrow)
+        create(:sales_log, :duplicate, saledate: Time.zone.yesterday)
       end
 
       it "does not return a log with a different sale date as a duplicate" do
@@ -1087,14 +1089,14 @@ RSpec.describe SalesLog, type: :model do
     let!(:sales_log) { create(:sales_log) }
 
     before do
-      LocalAuthority.find_by(code: "E08000003").update!(end_date: Time.zone.today)
+      LocalAuthority.find_by(code: "E08000003").update!(end_date: Time.zone.yesterday)
     end
 
     it "removes the LA" do
-      sales_log.update!(saledate: Time.zone.yesterday, la: "E08000003")
+      sales_log.update!(saledate: 2.days.ago, la: "E08000003")
       expect(sales_log.reload.la).to eq("E08000003")
 
-      sales_log.update!(saledate: Time.zone.tomorrow)
+      sales_log.update!(saledate: Time.zone.today)
       expect(sales_log.reload.la).to eq(nil)
       expect(sales_log.reload.is_la_inferred).to eq(false)
     end