diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..cd6939e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "db/groupdate"]
+	path = db/groupdate
+	url = https://github.com/ankane/groupdate.sql
diff --git a/db/groupdate b/db/groupdate
new file mode 160000
index 0000000..e8eaa5b
--- /dev/null
+++ b/db/groupdate
@@ -0,0 +1 @@
+Subproject commit e8eaa5b42d9e0ccd1628240a8b86ceb975ed4205
diff --git a/db/migrate/20220324131233_groupdate.rb b/db/migrate/20220324131233_groupdate.rb
new file mode 100644
index 0000000..60c9c9b
--- /dev/null
+++ b/db/migrate/20220324131233_groupdate.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+# Instala las funciones de agrupamiento por fecha
+class Groupdate < ActiveRecord::Migration[6.1]
+  def up
+    groupdate = File.read(Rails.root.join('db', 'groupdate', 'postgresql', 'install.sql')).sub(/(BEGIN|COMMIT);/, ''
+    ActiveRecord::Base.connection.execute(groupdate)
+  end
+
+  def down
+    groupdate = File.read(Rails.root.join('db', 'groupdate', 'postgresql', 'uninstall.sql')).sub(/(BEGIN|COMMIT);/, ''
+    ActiveRecord::Base.connection.execute(groupdate)
+  end
+end