diff --git a/package.json b/package.json
index 2a8420f..a459b87 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   ],
   "scripts": {
     "postinstall": "manypkg check",
-    "prebuild": "yarn workspace @kablamo/kerosene run build",
+    "prebuild": "yarn workspace @kablamo/rollup-plugin-resolve-externals run build && yarn workspace @kablamo/kerosene run build",
     "build": "yarn workspaces run build",
     "clean": "yarn workspaces run clean",
     "lint": "eslint .",
diff --git a/packages/kerosene-test/package.json b/packages/kerosene-test/package.json
index 37f770f..904c64e 100644
--- a/packages/kerosene-test/package.json
+++ b/packages/kerosene-test/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kablamo/kerosene-test",
-  "version": "0.0.14",
+  "version": "0.0.15",
   "repository": "https://github.com/KablamoOSS/kerosene/tree/master/packages/kerosene-test",
   "bugs": {
     "url": "https://github.com/KablamoOSS/kerosene/issues"
@@ -46,7 +46,7 @@
     "utils"
   ],
   "dependencies": {
-    "@kablamo/kerosene": "^0.0.38",
+    "@kablamo/kerosene": "^0.0.39",
     "@types/lodash": "^4.14.202",
     "@types/sinon": "^17.0.2",
     "lodash": "^4.17.21",
diff --git a/packages/kerosene-ui/package.json b/packages/kerosene-ui/package.json
index c95bebc..68e0061 100644
--- a/packages/kerosene-ui/package.json
+++ b/packages/kerosene-ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kablamo/kerosene-ui",
-  "version": "0.0.38",
+  "version": "0.0.39",
   "repository": "https://github.com/KablamoOSS/kerosene/tree/master/packages/kerosene-ui",
   "bugs": {
     "url": "https://github.com/KablamoOSS/kerosene/issues"
@@ -35,14 +35,15 @@
     "node": ">=18.12.0"
   },
   "dependencies": {
-    "@kablamo/kerosene": "^0.0.38",
+    "@kablamo/kerosene": "^0.0.39",
     "@types/lodash": "^4.14.202",
     "esbuild-register": "^3.5.0",
     "lodash": "^4.17.21",
     "use-sync-external-store": "^1.2.0"
   },
   "devDependencies": {
-    "@kablamo/kerosene-test": "^0.0.14",
+    "@kablamo/kerosene-test": "^0.0.15",
+    "@kablamo/rollup-plugin-resolve-externals": "^0.0.1",
     "@optimize-lodash/rollup-plugin": "^4.0.4",
     "@sinonjs/fake-timers": "^11.2.2",
     "@tanstack/react-query": "^5.12.2",
diff --git a/packages/kerosene-ui/rollup-config.ts b/packages/kerosene-ui/rollup-config.ts
index ce20189..32b31f5 100644
--- a/packages/kerosene-ui/rollup-config.ts
+++ b/packages/kerosene-ui/rollup-config.ts
@@ -1,6 +1,7 @@
+import resolveExternals from "@kablamo/rollup-plugin-resolve-externals";
 import { optimizeLodashImports } from "@optimize-lodash/rollup-plugin";
 import path from "path";
-import type { RollupOptions, ExternalOption } from "rollup";
+import type { RollupOptions } from "rollup";
 import esbuild from "rollup-plugin-esbuild";
 import packageJson from "./package.json";
 
@@ -11,20 +12,20 @@ const input = [
 
 const outputDir = path.dirname(packageJson.main);
 
-const externals = [
-  packageJson.dependencies,
-  packageJson.peerDependencies,
-].flatMap(Object.keys);
-
-const external: ExternalOption = (source) =>
-  externals.includes(source) ||
-  externals.some((mod) => source.startsWith(`${mod}/`));
-
-const plugins = [esbuild(), optimizeLodashImports()];
+const plugins = [
+  resolveExternals({
+    externals: [packageJson.dependencies, packageJson.peerDependencies].flatMap(
+      Object.keys,
+    ),
+  }),
+  esbuild(),
+  optimizeLodashImports(),
+];
 
 export default [
   {
     input,
+    makeAbsoluteExternalsRelative: true,
     output: [
       {
         entryFileNames: "[name].cjs",
@@ -38,11 +39,11 @@ export default [
         entryFileNames: "[name].mjs",
         dir: outputDir,
         format: "es",
+        interop: "auto",
         preserveModules: true,
         sourcemap: true,
       },
     ],
-    external,
     plugins,
   },
 ] satisfies RollupOptions[];
diff --git a/packages/kerosene-ui/src/index.ts b/packages/kerosene-ui/src/index.ts
index 1ec4bc5..0858cc7 100644
--- a/packages/kerosene-ui/src/index.ts
+++ b/packages/kerosene-ui/src/index.ts
@@ -29,6 +29,11 @@ export { default as usePrevious } from "./hooks/usePrevious";
 export { default as useRafThrottle } from "./hooks/useRafThrottle";
 export { default as useRect } from "./hooks/useRect";
 export { default as useStableIdentity } from "./hooks/useStableIdentity";
+export {
+  default as useTimeZone,
+  TimeZoneProvider,
+  type TimeZoneProviderProps,
+} from "./hooks/useTimeZone";
 export { default as useUpdatingRef } from "./hooks/useUpdatingRef";
 
 export { default as ShowWhen } from "./components/ShowWhen";
diff --git a/packages/kerosene/package.json b/packages/kerosene/package.json
index 8bbe34f..7881a75 100644
--- a/packages/kerosene/package.json
+++ b/packages/kerosene/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kablamo/kerosene",
-  "version": "0.0.38",
+  "version": "0.0.39",
   "repository": "https://github.com/KablamoOSS/kerosene/tree/master/packages/kerosene",
   "bugs": {
     "url": "https://github.com/KablamoOSS/kerosene/issues"
@@ -37,6 +37,7 @@
     "lodash": "^4.17.21"
   },
   "devDependencies": {
+    "@kablamo/rollup-plugin-resolve-externals": "^0.0.1",
     "@optimize-lodash/rollup-plugin": "^4.0.4",
     "@sinonjs/fake-timers": "^11.2.2",
     "@types/seed-random": "^2.2.4",
diff --git a/packages/kerosene/rollup-config.ts b/packages/kerosene/rollup-config.ts
index 4d61409..5b360fc 100644
--- a/packages/kerosene/rollup-config.ts
+++ b/packages/kerosene/rollup-config.ts
@@ -1,6 +1,7 @@
+import resolveExternals from "@kablamo/rollup-plugin-resolve-externals";
 import { optimizeLodashImports } from "@optimize-lodash/rollup-plugin";
 import path from "path";
-import type { ExternalOption, RollupOptions } from "rollup";
+import type { RollupOptions } from "rollup";
 import esbuild from "rollup-plugin-esbuild";
 import packageJson from "./package.json";
 
@@ -8,16 +9,15 @@ const input = path.join(__dirname, "src", "index.ts");
 
 const outputDir = path.dirname(packageJson.main);
 
-const externals = [
-  packageJson.dependencies,
-  packageJson.peerDependencies,
-].flatMap(Object.keys);
-
-const external: ExternalOption = (source) =>
-  externals.includes(source) ||
-  externals.some((mod) => source.startsWith(`${mod}/`));
-
-const plugins = [esbuild(), optimizeLodashImports()];
+const plugins = [
+  resolveExternals({
+    externals: [packageJson.dependencies, packageJson.peerDependencies].flatMap(
+      Object.keys,
+    ),
+  }),
+  esbuild(),
+  optimizeLodashImports(),
+];
 
 export default [
   {
@@ -35,11 +35,11 @@ export default [
         entryFileNames: "[name].mjs",
         dir: outputDir,
         format: "es",
+        interop: "auto",
         preserveModules: true,
         sourcemap: true,
       },
     ],
-    external,
     plugins,
   },
 ] satisfies RollupOptions[];
diff --git a/packages/rollup-plugin-resolve-externals/.npmignore b/packages/rollup-plugin-resolve-externals/.npmignore
new file mode 100644
index 0000000..e69de29
diff --git a/packages/rollup-plugin-resolve-externals/package.json b/packages/rollup-plugin-resolve-externals/package.json
new file mode 100644
index 0000000..0dd796b
--- /dev/null
+++ b/packages/rollup-plugin-resolve-externals/package.json
@@ -0,0 +1,54 @@
+{
+  "name": "@kablamo/rollup-plugin-resolve-externals",
+  "version": "0.0.1",
+  "repository": "https://github.com/KablamoOSS/kerosene/tree/master/packages/rollup-plugin-resolve-externals",
+  "bugs": {
+    "url": "https://github.com/KablamoOSS/kerosene/issues"
+  },
+  "contributors": [
+    {
+      "name": "Kablamo",
+      "url": "https://www.kablamo.com.au"
+    },
+    {
+      "name": "Nathan Hardy",
+      "email": "nathan.hardy@kablamo.com.au",
+      "url": "https://nhardy.id.au"
+    }
+  ],
+  "homepage": "https://github.com/KablamoOSS/kerosene",
+  "private": false,
+  "license": "MIT",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "directories": {
+    "doc": "readme.md"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "engines": {
+    "node": ">=18.12.0"
+  },
+  "keywords": [
+    "kablamo",
+    "kerosene",
+    "rollup",
+    "plugin",
+    "externals",
+    "resolve"
+  ],
+  "dependencies": {
+    "lodash": "^4.17.21"
+  },
+  "devDependencies": {
+    "rollup": "^4.5.1"
+  },
+  "peerDependencies": {
+    "rollup": "^4.5.1"
+  },
+  "scripts": {
+    "build": "tsc",
+    "clean": "rimraf .dist"
+  }
+}
diff --git a/packages/rollup-plugin-resolve-externals/src/index.ts b/packages/rollup-plugin-resolve-externals/src/index.ts
new file mode 100644
index 0000000..2253db2
--- /dev/null
+++ b/packages/rollup-plugin-resolve-externals/src/index.ts
@@ -0,0 +1,79 @@
+import { escapeRegExp } from "lodash";
+import path from "path";
+import type { ExternalOption, Plugin } from "rollup";
+
+export interface ResolveExternalsPluginOptions {
+  /**
+   * List of external modules
+   */
+  externals: readonly string[];
+  /**
+   * `paths` used by `require.resolve(name, { paths })` to resolve dependencies
+   */
+  paths?: string[];
+}
+
+export default function resolveExternals({
+  externals,
+  paths = require.main?.paths,
+}: ResolveExternalsPluginOptions): Plugin {
+  const external = ((source) =>
+    externals.includes(source) ||
+    externals.some((mod) =>
+      source.startsWith(`${mod}/`),
+    )) satisfies ExternalOption;
+  const deepExternalRegex = new RegExp(
+    `^(${externals.map((e) => escapeRegExp(e)).join("|")})/(.+)$`,
+  );
+
+  return {
+    name: "@kablamo/rollup-plugin-resolve-externals",
+
+    resolveId(source) {
+      // Ignore non-externals
+      if (!external) return null;
+
+      // Match deep imports from a package
+      const match = deepExternalRegex.exec(source);
+      if (match) {
+        const [, mod, importPath] = match;
+        // eslint-disable-next-line import/no-dynamic-require, global-require, @typescript-eslint/no-var-requires
+        const pkgJson = require(`${mod}/package.json`) as Record<
+          string,
+          unknown
+        >;
+
+        // If package exports are not defined, we need to resolve the path so that CommonJS files
+        // can be resolved properly from `.mjs` files
+        if (!pkgJson.exports) {
+          // Resolve the module to a path on disk
+          const resolvedPath = require.resolve(`${mod}/${importPath}`, {
+            paths,
+          });
+          // Rewrite to a relative path
+          const rewritten = `${mod}/${path
+            .relative(
+              path.dirname(
+                require.resolve(`${mod}/package.json`, {
+                  paths,
+                }),
+              ),
+              resolvedPath,
+            )
+            // Handle win32 path separators
+            .split(path.sep)
+            .join("/")}`;
+          return {
+            id: rewritten,
+            external: true,
+          };
+        }
+      }
+
+      return {
+        id: source,
+        external: true,
+      };
+    },
+  };
+}
diff --git a/packages/rollup-plugin-resolve-externals/tsconfig.json b/packages/rollup-plugin-resolve-externals/tsconfig.json
new file mode 100644
index 0000000..355b9b4
--- /dev/null
+++ b/packages/rollup-plugin-resolve-externals/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "extends": "../../tsconfig",
+  "compilerOptions": {
+    "outDir": "dist",
+    "noEmit": false,
+    "allowJs": false,
+    "declaration": true,
+    "declarationDir": "dist"
+  },
+  "include": ["src/**/*.ts"]
+}