diff --git a/apps/web/pages/changelog.tsx b/apps/web/pages/changelog.tsx
index b5b6a78..669a019 100644
--- a/apps/web/pages/changelog.tsx
+++ b/apps/web/pages/changelog.tsx
@@ -47,11 +47,17 @@ export default function Changelog({
         <div className="space-y-12">
           {posts.map((post, index) => (
             <ChangelogPost key={post.id} post={post}>
-              {({ title, content, tags, formattedDate }) => (
+              {({ title, content, tags, publicationDate }) => (
                 <article className="md:border-l-2 md:border-gray-200 md:dark:border-gray-700 md:pl-6">
-                  <time className="text-sm text-gray-500 dark:text-gray-400">
-                    {formattedDate}
-                  </time>
+                  {publicationDate && (
+                    <time className="text-sm text-gray-500 dark:text-gray-400">
+                      {new Date(publicationDate).toLocaleDateString("en-US", {
+                        year: "numeric",
+                        month: "long",
+                        day: "numeric",
+                      })}
+                    </time>
+                  )}
                   <h2 className={`text-2xl font-semibold text-gray-900 dark:text-white mt-1 mb-3 underline ${UNDERLINE_COLORS[index % UNDERLINE_COLORS.length]}`}>
                     {title}
                   </h2>
diff --git a/packages/core-sdk/README.md b/packages/core-sdk/README.md
new file mode 100644
index 0000000..2bad938
--- /dev/null
+++ b/packages/core-sdk/README.md
@@ -0,0 +1,81 @@
+# @changespage/core
+
+Framework-agnostic JavaScript SDK for changes.page.
+
+## Installation
+
+```bash
+npm install @changespage/core
+```
+
+## Usage
+
+```ts
+import { createChangesPageClient } from '@changespage/core';
+
+const client = createChangesPageClient({
+  baseUrl: 'https://yourpage.changes.page'
+});
+
+const { posts, totalCount, hasMore } = await client.getPosts({ limit: 10 });
+
+const latestPost = await client.getLatestPost();
+
+const pinnedPost = await client.getPinnedPost();
+```
+
+## API
+
+### `createChangesPageClient(config)`
+
+| Option | Type | Description |
+|--------|------|-------------|
+| `baseUrl` | `string` | Your changes.page URL |
+
+### `client.getPosts(options?)`
+
+| Option | Type | Default | Description |
+|--------|------|---------|-------------|
+| `limit` | `number` | 10 | Posts per page (max 50) |
+| `offset` | `number` | 0 | Pagination offset |
+
+Returns `{ posts, totalCount, hasMore }`
+
+### `client.getLatestPost()`
+
+Returns the most recent post or `null`.
+
+### `client.getPinnedPost()`
+
+Returns the pinned post or `null` if none is pinned.
+
+## Utilities
+
+### `getTagLabel(tag)`
+
+Returns a display label for a post tag.
+
+```ts
+import { getTagLabel } from '@changespage/core';
+
+getTagLabel('new'); // "New"
+getTagLabel('fix'); // "Fix"
+```
+
+## Types
+
+```ts
+type PostTag = 'fix' | 'new' | 'improvement' | 'announcement' | 'alert';
+
+interface Post {
+  id: string;
+  title: string;
+  content: string;
+  tags: PostTag[];
+  publication_date: string | null;
+  updated_at: string;
+  created_at: string;
+  url: string;
+  plain_text_content: string;
+}
+```
diff --git a/packages/core-sdk/package.json b/packages/core-sdk/package.json
new file mode 100644
index 0000000..2203eb9
--- /dev/null
+++ b/packages/core-sdk/package.json
@@ -0,0 +1,34 @@
+{
+  "name": "@changespage/core",
+  "version": "0.1.0",
+  "type": "module",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "rimraf dist && tsc",
+    "prepublishOnly": "npm run build"
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "rimraf": "^6.1.0",
+    "typescript": "^5.3.3"
+  },
+  "author": "Arjun Komath <arjunkomath@gmail.com>",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/techulus/changes-page.git"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}
diff --git a/packages/react-sdk/src/client.ts b/packages/core-sdk/src/client.ts
similarity index 70%
rename from packages/react-sdk/src/client.ts
rename to packages/core-sdk/src/client.ts
index 3a1907b..cafca0e 100644
--- a/packages/react-sdk/src/client.ts
+++ b/packages/core-sdk/src/client.ts
@@ -52,8 +52,30 @@ export function createChangesPageClient(config: ClientConfig): ChangesPageClient
     return result.posts[0] ?? null;
   }
 
+  async function getPinnedPost(): Promise<Post | null> {
+    const response = await fetch(`${baseUrl}/api/pinned`, {
+      headers: {
+        "X-API-Version": API_VERSION,
+      },
+    });
+
+    if (!response.ok) {
+      if (response.status === 404) {
+        return null;
+      }
+      const errorData = await response.json().catch(() => ({}));
+      const errorMessage =
+        (errorData as { error?: string }).error || response.statusText;
+      throw new Error(errorMessage);
+    }
+
+    const data: Post | null = await response.json();
+    return data;
+  }
+
   return {
     getPosts,
     getLatestPost,
+    getPinnedPost,
   };
 }
diff --git a/packages/core-sdk/src/index.ts b/packages/core-sdk/src/index.ts
new file mode 100644
index 0000000..049d6bb
--- /dev/null
+++ b/packages/core-sdk/src/index.ts
@@ -0,0 +1,10 @@
+export { createChangesPageClient } from "./client";
+export { getTagLabel } from "./utils";
+export type {
+  ChangesPageClient,
+  ClientConfig,
+  GetPostsOptions,
+  GetPostsResult,
+  Post,
+  PostTag,
+} from "./types";
diff --git a/packages/core-sdk/src/types.ts b/packages/core-sdk/src/types.ts
new file mode 100644
index 0000000..39bcf2a
--- /dev/null
+++ b/packages/core-sdk/src/types.ts
@@ -0,0 +1,34 @@
+export type PostTag = "fix" | "new" | "improvement" | "announcement" | "alert";
+
+export interface Post {
+  id: string;
+  title: string;
+  content: string;
+  tags: PostTag[];
+  publication_date: string | null;
+  updated_at: string;
+  created_at: string;
+  url: string;
+  plain_text_content: string;
+}
+
+export interface ClientConfig {
+  baseUrl: string;
+}
+
+export interface GetPostsOptions {
+  limit?: number;
+  offset?: number;
+}
+
+export interface GetPostsResult {
+  posts: Post[];
+  totalCount: number;
+  hasMore: boolean;
+}
+
+export interface ChangesPageClient {
+  getPosts: (options?: GetPostsOptions) => Promise<GetPostsResult>;
+  getLatestPost: () => Promise<Post | null>;
+  getPinnedPost: () => Promise<Post | null>;
+}
diff --git a/packages/core-sdk/src/utils.ts b/packages/core-sdk/src/utils.ts
new file mode 100644
index 0000000..dbcf64c
--- /dev/null
+++ b/packages/core-sdk/src/utils.ts
@@ -0,0 +1,13 @@
+import type { PostTag } from "./types";
+
+const tagLabels: Record<PostTag, string> = {
+  fix: "Fix",
+  new: "New",
+  improvement: "Improvement",
+  announcement: "Announcement",
+  alert: "Alert",
+};
+
+export function getTagLabel(tag: PostTag): string {
+  return tagLabels[tag] ?? tag;
+}
diff --git a/packages/core-sdk/tsconfig.json b/packages/core-sdk/tsconfig.json
new file mode 100644
index 0000000..dd6a803
--- /dev/null
+++ b/packages/core-sdk/tsconfig.json
@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022", "DOM"],
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "rootDir": "./src",
+    "outDir": "./dist",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "isolatedModules": true,
+    "verbatimModuleSyntax": true
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/packages/react-sdk/README.md b/packages/react-sdk/README.md
index d8403e0..66ea2c8 100644
--- a/packages/react-sdk/README.md
+++ b/packages/react-sdk/README.md
@@ -25,10 +25,10 @@ export default async function ChangelogPage() {
     <div>
       {posts.map(post => (
         <ChangelogPost key={post.id} post={post}>
-          {({ title, content, tags, formattedDate, url }) => (
+          {({ title, content, tags, publicationDate, url }) => (
             <article>
               <h2>{title}</h2>
-              <time>{formattedDate}</time>
+              {publicationDate && <time>{new Date(publicationDate).toLocaleDateString()}</time>}
               <div>{tags.map(t => <span key={t}>{t}</span>)}</div>
               <ReactMarkdown>{content}</ReactMarkdown>
             </article>
@@ -65,7 +65,7 @@ Returns the most recent post or `null`.
 
 Render prop component exposing:
 
-- `id`, `title`, `content` (markdown), `plainText`, `tags`, `date`, `formattedDate`, `url`
+- `id`, `title`, `content` (markdown), `plainText`, `tags`, `publicationDate`, `url`
 
 ## Hook
 
diff --git a/packages/react-sdk/package.json b/packages/react-sdk/package.json
index ee1cd19..a914a8b 100644
--- a/packages/react-sdk/package.json
+++ b/packages/react-sdk/package.json
@@ -17,7 +17,9 @@
     "build": "rimraf dist && tsc",
     "prepublishOnly": "npm run build"
   },
-  "dependencies": {},
+  "dependencies": {
+    "@changespage/core": "workspace:*"
+  },
   "devDependencies": {
     "@types/react": "^18.3.18",
     "react": "^18.3.1",
diff --git a/packages/react-sdk/src/components/ChangelogPost.tsx b/packages/react-sdk/src/components/ChangelogPost.tsx
index a90e568..4e417e0 100644
--- a/packages/react-sdk/src/components/ChangelogPost.tsx
+++ b/packages/react-sdk/src/components/ChangelogPost.tsx
@@ -1,15 +1,13 @@
 import type { ChangelogPostProps, ChangelogPostRenderProps } from "../types";
-import { formatDate, parseDate } from "../utils";
 
-export function ChangelogPost({ post, locale, children }: ChangelogPostProps) {
+export function ChangelogPost({ post, children }: ChangelogPostProps) {
   const renderProps: ChangelogPostRenderProps = {
     id: post.id,
     title: post.title,
     content: post.content,
     plainText: post.plain_text_content,
     tags: post.tags,
-    date: parseDate(post.publication_date),
-    formattedDate: formatDate(post.publication_date, locale),
+    publicationDate: post.publication_date,
     url: post.url,
   };
 
diff --git a/packages/react-sdk/src/hooks/usePosts.ts b/packages/react-sdk/src/hooks/usePosts.ts
index acc823f..d79b24b 100644
--- a/packages/react-sdk/src/hooks/usePosts.ts
+++ b/packages/react-sdk/src/hooks/usePosts.ts
@@ -1,7 +1,7 @@
 "use client";
 
 import { useState, useCallback, useEffect, useRef } from "react";
-import type { ChangesPageClient, Post } from "../types";
+import type { ChangesPageClient, Post } from "@changespage/core";
 
 export interface UsePostsInitialData {
   posts: Post[];
diff --git a/packages/react-sdk/src/index.ts b/packages/react-sdk/src/index.ts
index ef4aaeb..cda0b21 100644
--- a/packages/react-sdk/src/index.ts
+++ b/packages/react-sdk/src/index.ts
@@ -1,17 +1,16 @@
-export { createChangesPageClient } from "./client";
-export { ChangelogPost } from "./components";
-export { usePosts } from "./hooks";
-export { formatDate, getTagLabel, parseDate } from "./utils";
+export { createChangesPageClient, getTagLabel } from "@changespage/core";
 export type {
   ChangesPageClient,
-  ChangelogPostProps,
-  ChangelogPostRenderProps,
   ClientConfig,
   GetPostsOptions,
   GetPostsResult,
   Post,
   PostTag,
-} from "./types";
+} from "@changespage/core";
+
+export { ChangelogPost } from "./components";
+export { usePosts } from "./hooks";
+export type { ChangelogPostProps, ChangelogPostRenderProps } from "./types";
 export type {
   UsePostsInitialData,
   UsePostsOptions,
diff --git a/packages/react-sdk/src/types.ts b/packages/react-sdk/src/types.ts
index c5d8ee9..60017da 100644
--- a/packages/react-sdk/src/types.ts
+++ b/packages/react-sdk/src/types.ts
@@ -1,33 +1,14 @@
 import type { ReactNode } from "react";
+import type { Post, PostTag } from "@changespage/core";
 
-export type PostTag = "fix" | "new" | "improvement" | "announcement" | "alert";
-
-export interface Post {
-  id: string;
-  title: string;
-  content: string;
-  tags: PostTag[];
-  publication_date: string | null;
-  updated_at: string;
-  created_at: string;
-  url: string;
-  plain_text_content: string;
-}
-
-export interface ClientConfig {
-  baseUrl: string;
-}
-
-export interface GetPostsOptions {
-  limit?: number;
-  offset?: number;
-}
-
-export interface GetPostsResult {
-  posts: Post[];
-  totalCount: number;
-  hasMore: boolean;
-}
+export type {
+  ChangesPageClient,
+  ClientConfig,
+  GetPostsOptions,
+  GetPostsResult,
+  Post,
+  PostTag,
+} from "@changespage/core";
 
 export interface ChangelogPostRenderProps {
   id: string;
@@ -35,18 +16,11 @@ export interface ChangelogPostRenderProps {
   content: string;
   plainText: string;
   tags: PostTag[];
-  date: Date | null;
-  formattedDate: string;
+  publicationDate: string | null;
   url: string;
 }
 
 export interface ChangelogPostProps {
   post: Post;
-  locale?: string;
   children: (props: ChangelogPostRenderProps) => ReactNode;
 }
-
-export interface ChangesPageClient {
-  getPosts: (options?: GetPostsOptions) => Promise<GetPostsResult>;
-  getLatestPost: () => Promise<Post | null>;
-}
diff --git a/packages/react-sdk/src/utils.ts b/packages/react-sdk/src/utils.ts
deleted file mode 100644
index 14ddfba..0000000
--- a/packages/react-sdk/src/utils.ts
+++ /dev/null
@@ -1,32 +0,0 @@
-import type { PostTag } from "./types";
-
-const tagLabels: Record<PostTag, string> = {
-  fix: "Fix",
-  new: "New",
-  improvement: "Improvement",
-  announcement: "Announcement",
-  alert: "Alert",
-};
-
-export function getTagLabel(tag: PostTag): string {
-  return tagLabels[tag] ?? tag;
-}
-
-export function formatDate(
-  dateString: string | null,
-  locale: string = "en-US"
-): string {
-  if (!dateString) return "";
-
-  const date = new Date(dateString);
-  return date.toLocaleDateString(locale, {
-    year: "numeric",
-    month: "long",
-    day: "numeric",
-  });
-}
-
-export function parseDate(dateString: string | null): Date | null {
-  if (!dateString) return null;
-  return new Date(dateString);
-}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 98a4dff..a292cc2 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -455,7 +455,20 @@ importers:
         specifier: ^5
         version: 5.8.3
 
+  packages/core-sdk:
+    devDependencies:
+      rimraf:
+        specifier: ^6.1.0
+        version: 6.1.2
+      typescript:
+        specifier: ^5.3.3
+        version: 5.8.3
+
   packages/react-sdk:
+    dependencies:
+      '@changespage/core':
+        specifier: workspace:*
+        version: link:../core-sdk
     devDependencies:
       '@types/react':
         specifier: ^18.3.18