diff --git a/Library/Homebrew/dev-cmd/contributions.rb b/Library/Homebrew/dev-cmd/contributions.rb
index c65b57b632..e27ac9e457 100644
--- a/Library/Homebrew/dev-cmd/contributions.rb
+++ b/Library/Homebrew/dev-cmd/contributions.rb
@@ -467,12 +467,15 @@ module Homebrew
 
         review_users = github_users.filter_map { |user, github_user| [user, github_user] if github_user }
         review_users.reject! { |user, _| lead_activity_met?(results.fetch(user)) } if skip_reviews_if_lead_met
+        approved_to = Date.iso8601(to).prev_day.iso8601
         review_users.each_with_index do |(user, github_user), index|
           if progress
             $stderr.puts "Querying approved-review search for #{user} (#{index + 1}/#{review_users.length})..."
           end
-          approved_reviews = cached_github_request(Array, "approved", organisation, github_user, from, to, to:) do
-            GitHub.search_approved_pull_requests_in_user_or_organisation(organisation, github_user, from:, to:)
+          approved_reviews = cached_github_request(Array, "approved", organisation, github_user, from, approved_to,
+                                                   to:) do
+            GitHub.search_approved_pull_requests_in_user_or_organisation(organisation, github_user,
+                                                                         from:, to: approved_to)
           end
           capped_reviews = approved_reviews.length >= MAX_PR_SEARCH
           results.fetch(user).fetch(repositories.fetch(0))[:approved_pr_review_hit_cap] = 1 if capped_reviews
@@ -496,9 +499,10 @@ module Homebrew
                     qualifying_total >= MAINTAINER_ACTIVITY_THRESHOLD
 
             $stderr.puts "Querying approved-review search for #{user} in #{repository}..." if progress
-            repository_reviews = cached_github_request(Array, "approved", repository, github_user, from, to, to:) do
+            repository_reviews = cached_github_request(Array, "approved", repository, github_user,
+                                                       from, approved_to, to:) do
               GitHub.search_issues("", is: "pr", review: "approved", repo: repository, reviewed_by: github_user,
-                                   from:, to:)
+                                   from:, to: approved_to)
             end
             repository_counts[:approved_pr_review] = repository_reviews.length
           end
diff --git a/Library/Homebrew/test/dev-cmd/contributions_spec.rb b/Library/Homebrew/test/dev-cmd/contributions_spec.rb
index 444fb0520f..0f1acd0614 100644
--- a/Library/Homebrew/test/dev-cmd/contributions_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/contributions_spec.rb
@@ -630,7 +630,7 @@ RSpec.describe Homebrew::DevCmd::Contributions do
       .with("", is: "merged", user: "Homebrew", author: "alice", merged: "2026-01-01..2026-01-31")
       .and_return([{ "number" => 123, "repository_url" => "#{GitHub::API_URL}/repos/#{repository}" }])
     expect(GitHub).to receive(:search_approved_pull_requests_in_user_or_organisation)
-      .with("Homebrew", "alice", from: "2026-01-01", to: "2026-02-01")
+      .with("Homebrew", "alice", from: "2026-01-01", to: "2026-01-31")
       .and_return([])
 
     results = command.scan_contributions(
@@ -944,13 +944,13 @@ RSpec.describe Homebrew::DevCmd::Contributions do
       .with("", is: "merged", user: "Homebrew", author: "alice", merged: "2025-12-01..2026-02-28")
       .and_return([])
     allow(GitHub).to receive(:search_approved_pull_requests_in_user_or_organisation)
-      .with("Homebrew", "alice", from: "2025-12-01", to: "2026-03-01")
+      .with("Homebrew", "alice", from: "2025-12-01", to: "2026-02-28")
       .and_return(Array.new(100) do
         { "repository_url" => "#{GitHub::API_URL}/repos/Homebrew/homebrew-cask" }
       end)
     expect(GitHub).to receive(:search_issues)
       .with("", is: "pr", review: "approved", repo: "Homebrew/brew", reviewed_by: "alice",
-            from: "2025-12-01", to: "2026-03-01")
+            from: "2025-12-01", to: "2026-02-28")
       .and_return(Array.new(25) { {} })
 
     results = command.scan_contributions(
@@ -969,7 +969,7 @@ RSpec.describe Homebrew::DevCmd::Contributions do
     end).to eq("Homebrew/brew" => 25, "Homebrew/homebrew-core" => 0, "Homebrew/homebrew-cask" => 100)
   end
 
-  it "uses the existing approved review search" do
+  it "excludes the end date from approved review searches" do
     command = described_class.new(["--maintainer-report-csv=2026-1"])
     repositories = Homebrew::DevCmd::Contributions::PRIMARY_REPOS.to_h do |repository|
       [repository, [Pathname("/#{repository}"), "origin/HEAD"]]
@@ -985,7 +985,7 @@ RSpec.describe Homebrew::DevCmd::Contributions do
       .with("", is: "merged", user: "Homebrew", author: "alice", merged: "2025-12-01..2026-02-28")
       .and_return([])
     allow(GitHub).to receive(:search_approved_pull_requests_in_user_or_organisation)
-      .with("Homebrew", "alice", from: "2025-12-01", to: "2026-03-01")
+      .with("Homebrew", "alice", from: "2025-12-01", to: "2026-02-28")
       .and_return([
         { "repository_url" => "#{GitHub::API_URL}/repos/Homebrew/brew" },
         { "repository_url" => "#{GitHub::API_URL}/repos/Homebrew/homebrew-core" },