diff --git a/pkgs/development/python-modules/oncalendar/default.nix b/pkgs/development/python-modules/oncalendar/default.nix
new file mode 100644
index 000000000000..976e663857dd
--- /dev/null
+++ b/pkgs/development/python-modules/oncalendar/default.nix
@@ -0,0 +1,30 @@
+{ lib
+, python
+, buildPythonPackage
+, fetchFromGitHub
+}:
+
+buildPythonPackage rec {
+  pname = "oncalendar";
+  version = "1.0";
+
+  src = fetchFromGitHub {
+    owner = "cuu508";
+    repo = "oncalendar";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-eQYxOnL4/TJbY/nijcPl8TqK2MrwcdISKGfZQoI7828=";
+  };
+
+  checkPhase = ''
+    ${python.interpreter} setup.py test
+  '';
+
+  pythonImportsCheck = [ "oncalendar" ];
+
+  meta = with lib; {
+    description = "A systemd OnCalendar expression parser and evaluator";
+    homepage = "https://github.com/cuu508/oncalendar";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ phaer ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 47752b01aee9..55a6fd244d5b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -8955,6 +8955,8 @@ self: super: with self; {
 
   omrdatasettools = callPackage ../development/python-modules/omrdatasettools { };
 
+  oncalendar = callPackage ../development/python-modules/oncalendar { };
+
   ondilo = callPackage ../development/python-modules/ondilo { };
 
   onetimepass = callPackage ../development/python-modules/onetimepass { };