acm-uiuc · zhuangy47 · Feb 5, 2026 · Feb 5, 2026 · Feb 5, 2026 · Feb 5, 2026
diff --git a/.github/workflows/cf-pages-deploy.yml b/.github/workflows/cf-pages-deploy.yml
@@ -20,6 +20,8 @@ jobs:
         timeout-minutes: 10
         steps:
             - uses: actions/checkout@v4
+              with:
+                fetch-depth: 0
             - uses: actions/setup-node@v4
               with:
                   node-version: 22.x

diff --git a/astro.config.mjs b/astro.config.mjs
@@ -1,12 +1,16 @@
 // @ts-check
 import { defineConfig } from 'astro/config';
+import { remarkModifiedTime } from './remark-modified-time.mjs';
 
 import mdx from '@astrojs/mdx';
 
 import tailwindcss from '@tailwindcss/vite';
 
 // https://astro.build/config
 export default defineConfig({
+  markdown: {
+    remarkPlugins: [remarkModifiedTime]
+  },
   outDir: './build',
   integrations: [mdx()],
   vite: {

diff --git a/package.json b/package.json
@@ -12,6 +12,7 @@
     "@astrojs/mdx": "^4.3.13",
     "@tailwindcss/vite": "^4.1.18",
     "astro": "^5.16.8",
+    "dayjs": "^1.11.19",
     "tailwindcss": "^4.1.18"
   }
 }
diff --git a/remark-modified-time.mjs b/remark-modified-time.mjs
@@ -0,0 +1,9 @@
+import { execSync } from "child_process";
+
+export function remarkModifiedTime() {
+  return function (tree, file) {
+    const filepath = file.history[0];
+    const result = execSync(`git log -1 --pretty="format:%cI" "${filepath}"`);
+    file.data.astro.frontmatter.lastModified = result.toString();
+  };
+}
diff --git a/src/layouts/BaseLayout.astro b/src/layouts/BaseLayout.astro
@@ -1,21 +1,34 @@
 ---
+import dayjs from "dayjs";
+import utc from "dayjs/plugin/utc";
+import timezone from "dayjs/plugin/timezone";
 import "../styles/global.css";
 import Sidebar from "../components/Sidebar.astro";
 import ThemeToggle from "../components/ThemeToggle.astro";
 
+dayjs.extend(utc)
+dayjs.extend(timezone)
+
 interface Props {
     title: string;
     description?: string;
     pageDescription?: string;
     showTitle?: boolean;
+    lastModified?: string;
 }
 
 const {
     title,
     description = "UIUC CS Wiki - A student-maintained guide to CS courses and resources",
     pageDescription,
     showTitle = false,
+    lastModified,
 } = Astro.props;
+
+const parsedDate = lastModified ? dayjs(lastModified) : null;
+const formattedDate = parsedDate?.isValid() 
+  ? parsedDate.tz("America/Chicago").format("MMMM DD, YYYY") 
+  : "Unknown";
 ---
 
 <!doctype html>
@@ -89,6 +102,12 @@ const {
                         )
                     }
                     <slot />
+
+                    {parsedDate && (
+                      <p class="mt-12 pt-4 border-t border-wiki-border text-sm text-wiki-muted">
+                        Last updated: {formattedDate}
+                      </p>
+                    )}
                 </div>
             </main>
         </div>

diff --git a/src/pages/classes/[subject]/[course].astro b/src/pages/classes/[subject]/[course].astro
@@ -16,11 +16,11 @@ export async function getStaticPaths() {
 }
 
 const { entry } = Astro.props;
-const { Content } = await entry.render();
+const { Content, remarkPluginFrontmatter } = await entry.render();
 const course = entry.data;
 ---
 
-<BaseLayout title={`${course.subject} ${course.number} ${course.section}`}>
+<BaseLayout title={`${course.subject} ${course.number} ${course.section}`} lastModified={remarkPluginFrontmatter.lastModified}>
   <nav class="mb-6 flex items-center gap-2 text-sm text-wiki-muted [&_a]:no-underline">
     <a href="/" class="hover:text-wiki-link">Home</a>
     <span>/</span>

diff --git a/src/pages/guides/[slug].astro b/src/pages/guides/[slug].astro
@@ -1,4 +1,5 @@
 ---
+import dayjs from "dayjs"
 import BaseLayout from "../../layouts/BaseLayout.astro";
 import { getCollection } from "astro:content";
 
@@ -12,10 +13,10 @@ export async function getStaticPaths() {
 }
 
 const { guide } = Astro.props;
-const { Content } = await guide.render();
+const { Content, remarkPluginFrontmatter } = await guide.render();
 ---
 
-<BaseLayout title={guide.data.title}>
+<BaseLayout title={guide.data.title} lastModified={remarkPluginFrontmatter.lastModified}>
   <nav class="mb-6 flex items-center gap-2 text-sm text-wiki-muted [&_a]:no-underline">
     <a href="/" class="hover:text-wiki-link">Home</a>
     <span>/</span>

diff --git a/yarn.lock b/yarn.lock
@@ -1158,6 +1158,11 @@ csso@^5.0.5:
   dependencies:
     css-tree "~2.2.0"
 
+dayjs@^1.11.19:
+  version "1.11.19"
+  resolved "https://registry.yarnpkg.com/dayjs/-/dayjs-1.11.19.tgz#15dc98e854bb43917f12021806af897c58ae2938"
+  integrity sha512-t5EcLVS6QPBNqM2z8fakk/NKel+Xzshgt8FFKAn+qwlD1pzZWxh0nVCrvFK7ZDb6XucZeF9z8C7CBWTRIVApAw==
+
 debug@^4.0.0, debug@^4.4.0, debug@^4.4.3:
   version "4.4.3"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.4.3.tgz#c6ae432d9bd9662582fce08709b038c58e9e3d6a"