diff --git a/Library/Homebrew/dev-cmd/contributions.rb b/Library/Homebrew/dev-cmd/contributions.rb
index e3ddbcb45c..90741e4e61 100755
--- a/Library/Homebrew/dev-cmd/contributions.rb
+++ b/Library/Homebrew/dev-cmd/contributions.rb
@@ -143,7 +143,7 @@ module Homebrew
       puts "Determining contributions for #{person} on #{repo_full_name}..." if args.verbose?
 
       data[repo] = {
-        commits:       GitHub.repo_commit_count_for_user(repo_full_name, person),
+        commits:       GitHub.repo_commit_count_for_user(repo_full_name, person, args),
         coauthorships: git_log_trailers_cmd(T.must(repo_path), person, "Co-authored-by", args),
         signoffs:      git_log_trailers_cmd(T.must(repo_path), person, "Signed-off-by", args),
       }
diff --git a/Library/Homebrew/utils/github.rb b/Library/Homebrew/utils/github.rb
index e4fc791c4c..1ca085109b 100644
--- a/Library/Homebrew/utils/github.rb
+++ b/Library/Homebrew/utils/github.rb
@@ -700,11 +700,15 @@ module GitHub
     output[/^Status: (200)/, 1] != "200"
   end
 
-  def repo_commit_count_for_user(nwo, user)
+  def repo_commit_count_for_user(nwo, user, args)
     return if Homebrew::EnvConfig.no_github_api?
 
+    params = ["author=#{user}"]
+    params << "since=#{DateTime.parse(args.from).iso8601}" if args.from
+    params << "until=#{DateTime.parse(args.to).iso8601}" if args.to
+
     commits = 0
-    API.paginate_rest("#{API_URL}/repos/#{nwo}/commits", additional_query_params: "author=#{user}") do |result|
+    API.paginate_rest("#{API_URL}/repos/#{nwo}/commits", additional_query_params: params.join("&")) do |result|
       commits += result.length
     end
     commits