diff --git a/pkgs/development/python-modules/cronsim/default.nix b/pkgs/development/python-modules/cronsim/default.nix
new file mode 100644
index 00000000000..35208bbd7b7
--- /dev/null
+++ b/pkgs/development/python-modules/cronsim/default.nix
@@ -0,0 +1,28 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "cronsim";
+  version = "2.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-nwlSAbD+y0l9jyVSVShzWeC7nC5RZRD/kAhCi3Nd9xY=";
+  };
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "cronsim" ];
+
+  meta = with lib; {
+    description = "Cron expression parser and evaluator";
+    homepage = "https://github.com/cuu508/cronsim";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ phaer ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 3fd558e3f9b..dec14ea59e8 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1978,6 +1978,8 @@ in {
 
   croniter = callPackage ../development/python-modules/croniter { };
 
+  cronsim = callPackage ../development/python-modules/cronsim { };
+
   crossplane = callPackage ../development/python-modules/crossplane { };
 
   crownstone-cloud = callPackage ../development/python-modules/crownstone-cloud { };