diff --git a/components/article/ArticlePage.tsx b/components/article/ArticlePage.tsx
index 888219eec00d..fb15bbabb9f5 100644
--- a/components/article/ArticlePage.tsx
+++ b/components/article/ArticlePage.tsx
@@ -32,6 +32,7 @@ export const ArticlePage = () => {
   const {
     title,
     intro,
+    effectiveDate,
     renderedPage,
     contributor,
     permissions,
@@ -153,6 +154,14 @@ export const ArticlePage = () => {
         >
           <div id="article-contents">
             <MarkdownContent>{renderedPage}</MarkdownContent>
+            {effectiveDate && (
+              <div className="mt-4" id="effectiveDate">
+                Effective as of:{' '}
+                <time dateTime={new Date(effectiveDate).toISOString()}>
+                  {new Date(effectiveDate).toDateString()}
+                </time>
+              </div>
+            )}
           </div>
         </ArticleGridLayout>
 
diff --git a/components/context/ArticleContext.tsx b/components/context/ArticleContext.tsx
index b6e09e7beae6..c6ced603aeb7 100644
--- a/components/context/ArticleContext.tsx
+++ b/components/context/ArticleContext.tsx
@@ -16,6 +16,7 @@ export type MiniTocItem = {
 export type ArticleContextT = {
   title: string
   intro: string
+  effectiveDate: string
   renderedPage: string
   miniTocItems: Array<MiniTocItem>
   contributor: { name: string; URL: string } | null
@@ -40,9 +41,19 @@ export const useArticleContext = (): ArticleContextT => {
 
 export const getArticleContextFromRequest = (req: any): ArticleContextT => {
   const page = req.context.page
+
+  if (page.effectiveDate) {
+    if (isNaN(Date.parse(page.effectiveDate))) {
+      throw new Error(
+        'The "effectiveDate" frontmatter property is not valid. Please make sure it is YEAR-MONTH-DAY'
+      )
+    }
+  }
+
   return {
     title: page.titlePlainText,
     intro: page.intro,
+    effectiveDate: page.effectiveDate || '',
     renderedPage: req.context.renderedPage || '',
     miniTocItems: req.context.miniTocItems || [],
     contributor: page.contributor || null,
diff --git a/content/README.md b/content/README.md
index 8a56ce0ab5e2..6f21aef351c3 100644
--- a/content/README.md
+++ b/content/README.md
@@ -29,6 +29,7 @@ See the [contributing docs](/CONTRIBUTING.md) for general information about work
   - [`topics`](#topics)
   - [`contributor`](#contributor)
   - [`communityRedirect`](#communityRedirect)
+  - [`effectiveDate`](#effectiveDate)
   - [Escaping single quotes](#escaping-single-quotes)
 - [Autogenerated mini TOCs](#autogenerated-mini-tocs)
 - [Versioning](#versioning)
@@ -270,6 +271,11 @@ includeGuides:
 - Type: `Object`. Properties are `name` and `href`.
 - Optional.
 
+### `effectiveDate`
+- **For GitHub staff only**: Set an effective date for Terms of Service articles so that engineering teams can automatically re-prompt users to confirm the terms
+- Type: `string` YEAR-MONTH-DAY e.g. 2021-10-04 is October 4th, 2021
+- Optional.
+
 Example:
 
 ```yaml
diff --git a/content/github/copilot/github-copilot-telemetry-terms.md b/content/github/copilot/github-copilot-telemetry-terms.md
index 940783a62f2c..ef3c3b99c628 100644
--- a/content/github/copilot/github-copilot-telemetry-terms.md
+++ b/content/github/copilot/github-copilot-telemetry-terms.md
@@ -6,6 +6,7 @@ redirect_from:
   - /github/copilot/telemetry-terms
 versions:
   fpt: '*'
+effectiveDate: '2021-10-04'
 ---
 
 ## Additional telemetry
diff --git a/lib/frontmatter.js b/lib/frontmatter.js
index a364198df2c3..89faf86d1a80 100644
--- a/lib/frontmatter.js
+++ b/lib/frontmatter.js
@@ -92,6 +92,9 @@ export const schema = {
     examples_source: {
       type: 'string',
     },
+    effectiveDate: {
+      type: 'string',
+    },
     featuredLinks: {
       type: 'object',
       properties: {
diff --git a/middleware/render-page.js b/middleware/render-page.js
index d0882d556af0..1fe891d68c55 100644
--- a/middleware/render-page.js
+++ b/middleware/render-page.js
@@ -32,6 +32,12 @@ export default async function renderPage(req, res, next) {
   // add page context
   const context = Object.assign({}, req.context, { page })
 
+  // Updating the Last-Modified header for substantive changes on a page for engineering
+  // Docs Engineering Issue #945
+  if (context.page.effectiveDate !== '') {
+    res.setHeader('Last-Modified', new Date(context.page.effectiveDate).toUTCString())
+  }
+
   // collect URLs for variants of this page in all languages
   context.page.languageVariants = Page.getLanguageVariants(req.pagePath)
   // Stop processing if the connection was already dropped