diff --git a/pkgs/desktops/gnome-3/extensions/clock-override/default.nix b/pkgs/desktops/gnome-3/extensions/clock-override/default.nix
new file mode 100644
index 00000000000..49df3632755
--- /dev/null
+++ b/pkgs/desktops/gnome-3/extensions/clock-override/default.nix
@@ -0,0 +1,37 @@
+{ stdenv, fetchzip, gnome3, gettext, glib }:
+
+stdenv.mkDerivation rec {
+  pname = "gnome-shell-extension-clock-override";
+  version = "12";
+
+  src = fetchzip {
+    url = "https://extensions.gnome.org/extension-data/clock-overridegnomeshell.kryogenix.org.v${version}.shell-extension.zip";
+    sha256 = "1cyaszks6bwnbgacqsl1pmr24mbj05mad59d4253la9am8ibb4m6";
+    stripRoot = false;
+  };
+
+  uuid = "clock-override@gnomeshell.kryogenix.org";
+
+  nativeBuildInputs = [ gettext glib ];
+
+  buildPhase = ''
+    runHook preBuild
+    glib-compile-schemas --strict --targetdir=schemas schemas
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p $out/share/gnome-shell/extensions/${uuid}
+    cp -r {convenience.js,extension.js,format.js,locale,metadata.json,prefs.js,schemas} $out/share/gnome-shell/extensions/${uuid}
+    runHook postInstall
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Customize the date and time format displayed in clock in the top bar in GNOME Shell";
+    license = licenses.mit;
+    maintainers = with maintainers; [ rhoriguchi ];
+    homepage = "https://github.com/stuartlangridge/gnome-shell-clock-override";
+    broken = versionOlder gnome3.gnome-shell.version "3.18";
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index aedbddf1269..21f5f5edf87 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -27219,6 +27219,7 @@ in
     arc-menu = callPackage ../desktops/gnome-3/extensions/arc-menu { };
     caffeine = callPackage ../desktops/gnome-3/extensions/caffeine { };
     clipboard-indicator = callPackage ../desktops/gnome-3/extensions/clipboard-indicator { };
+    clock-override = callPackage ../desktops/gnome-3/extensions/clock-override { };
     dash-to-dock = callPackage ../desktops/gnome-3/extensions/dash-to-dock { };
     dash-to-panel = callPackage ../desktops/gnome-3/extensions/dash-to-panel { };
     draw-on-your-screen = callPackage ../desktops/gnome-3/extensions/draw-on-your-screen { };