diff --git a/lib/tasks/batch_add_contributors.rake b/lib/tasks/batch_add_contributors.rake
index f6feb332f..719b271bf 100644
--- a/lib/tasks/batch_add_contributors.rake
+++ b/lib/tasks/batch_add_contributors.rake
@@ -93,12 +93,16 @@ namespace :batch_add_contributors do
 
       sql_connection = ActiveRecord::Base.connection
       sql_connection.begin_db_transaction
-      if Issue.find_by_sql("select id from commit_contributors where name='#{commiter['email']}'").present?
-        sql = "update commit_contributors set created_at ='#{commit_date_str}' where name='#{commiter['email']}'"
+      site = Site.find_by_sql("select id, created_at from commit_contributors where name='#{commiter['email']}'")
+      if site.present?
+        puts "commit_date====#{commit_date},created_at======#{site.created_at}"
+        if commit_date.to_i < site.created_at.to_i
+          sql = "update commit_contributors set created_at ='#{commit_date_str}' where name='#{commiter['email']}'"
+        end
       else
         sql = "INSERT INTO commit_contributors (`created_at`, `count`, `name`) VALUES ('#{commit_date_str}',1,'#{commiter['email']}')"
       end
-      puts "sql====#{sql}"
+      # puts "sql====#{sql}"
 
       sql_connection.execute(sql)
       sql_connection.commit_db_transaction