diff --git a/manifest.dhall b/manifest.dhall
index 229413e94700a6844689704e4676b8ecf4845fee..f594b2b0a47ddf0bb52d9018dd9aedbe8c4661e6 100644
--- a/manifest.dhall
+++ b/manifest.dhall
@@ -417,6 +417,11 @@ in  [ callHackage "Cabal" "3.8.1.0"
     , callHackage "th-lift-instances" "0.1.20"
     , callHackage "tidal" "1.8.1"
     , callHackage "time-compat" "1.9.6.1"
+    , callCabal2nix
+        "time-effectful"
+        "https://github.com/haskell-effectful/time-effectful"
+        (Some "e212239b685e1ecf7ee95dd1e944cc563351907f")
+        (None Text)
     , callHackage "type-errors-pretty" "0.0.1.2"
     , callHackage "type-errors" "0.2.0.0"
     , callHackage "type-equality" "1"
diff --git a/overlay.nix b/overlay.nix
index 96aa607cab759c43c71983da31f5607f2f5b8223..ad2fce00fbe9d2bd3bf1422cc44e24a3370ac558 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -507,6 +507,8 @@ final: prev: with pkgs.haskell.lib; {
 
     time-compat = prev.callPackage (./pkgs/time-compat.nix) { };
 
+    time-effectful = prev.callPackage (./pkgs/time-effectful.nix) { };
+
     type-equality = prev.callPackage (./pkgs/type-equality.nix) { };
 
     type-errors = prev.callPackage (./pkgs/type-errors.nix) { };
diff --git a/pkgs/time-effectful.nix b/pkgs/time-effectful.nix
new file mode 100644
index 0000000000000000000000000000000000000000..36ff42455fc17b9032e1c4d7bbe1bff6b9d551e4
--- /dev/null
+++ b/pkgs/time-effectful.nix
@@ -0,0 +1,23 @@
+{ mkDerivation, base, effectful-core, fetchgit, lib, tasty
+, tasty-hunit, time
+}:
+mkDerivation {
+  pname = "time-effectful";
+  version = "0.0.1.0";
+  src = fetchgit {
+    url = "https://github.com/haskell-effectful/time-effectful";
+    sha256 = "12sir7ln4nfx9w5xz77g23jlfvhnwvv4gzw20czj6vbpak8zz3i1";
+    rev = "e212239b685e1ecf7ee95dd1e944cc563351907f";
+    fetchSubmodules = true;
+  };
+  libraryHaskellDepends = [ base effectful-core time ];
+  testHaskellDepends = [
+    base effectful-core tasty tasty-hunit time
+  ];
+  doHaddock = false;
+  jailbreak = true;
+  doCheck = false;
+  hyperlinkSource = false;
+  homepage = "https://github.com/haskell-effectful/time-effectful#readme";
+  license = lib.licenses.mit;
+}
\ No newline at end of file