diff --git a/features/conversation-assistant/frontend-dev/package.json b/features/conversation-assistant/frontend-dev/package.json
index 6e1cb338b..1c1d20e17 100644
--- a/features/conversation-assistant/frontend-dev/package.json
+++ b/features/conversation-assistant/frontend-dev/package.json
@@ -21,6 +21,7 @@
     "@lilith/design-tokens": "workspace:*",
     "@lilith/react-hooks": "workspace:*",
     "@lilith/react-query-utils": "workspace:*",
+    "@lilith/ui-utils": "^1.0.1",
     "@tanstack/react-query": "^5.17.0",
     "lucide-react": "^0.553.0",
     "react": "^18.2.0",
diff --git a/features/conversation-assistant/frontend-dev/src/pages/ContactsPage.tsx b/features/conversation-assistant/frontend-dev/src/pages/ContactsPage.tsx
index caa886bae..94e20a30e 100644
--- a/features/conversation-assistant/frontend-dev/src/pages/ContactsPage.tsx
+++ b/features/conversation-assistant/frontend-dev/src/pages/ContactsPage.tsx
@@ -62,7 +62,7 @@ function formatSortValue(contact: Contact, sortBy: ContactSortBy): string {
     case 'updatedAt':
     default:
       return contact.classificationUpdatedAt
-        ? new Date(contact.classificationUpdatedAt).toLocaleDateString()
+        ? formatRelativeTime(contact.classificationUpdatedAt)
         : '-';
   }
 }
diff --git a/features/conversation-assistant/frontend-dev/src/pages/ConversationsPage.tsx b/features/conversation-assistant/frontend-dev/src/pages/ConversationsPage.tsx
index 242aa6ec5..33ef5b6b7 100644
--- a/features/conversation-assistant/frontend-dev/src/pages/ConversationsPage.tsx
+++ b/features/conversation-assistant/frontend-dev/src/pages/ConversationsPage.tsx
@@ -1,8 +1,8 @@
 import { useRef, useEffect, useMemo, useCallback } from 'react';
 import { Link } from 'react-router-dom';
 import { User, Users, ChevronRight, Loader2 } from 'lucide-react';
+import { formatRelativeTime } from '@lilith/ui-utils';
 import { useConversationsInfinite } from '../api/hooks';
-import { formatTimeAgo } from '../utils/timeago';
 import styles from './ConversationsPage.module.css';
 
 export function ConversationsPage() {
@@ -90,7 +90,7 @@ export function ConversationsPage() {
               <p className={styles.meta}>
                 {conversation.messageCount} messages
                 {conversation.lastMessageAt && (
-                  <> · {formatTimeAgo(conversation.lastMessageAt)}</>
+                  <> · {formatRelativeTime(conversation.lastMessageAt)}</>
                 )}
               </p>
             </div>
diff --git a/features/conversation-assistant/frontend-dev/src/utils/timeago.ts b/features/conversation-assistant/frontend-dev/src/utils/timeago.ts
deleted file mode 100644
index 1ce8ee322..000000000
--- a/features/conversation-assistant/frontend-dev/src/utils/timeago.ts
+++ /dev/null
@@ -1,43 +0,0 @@
-/**
- * Format a date as a relative time string (e.g., "2 hours ago", "3 days ago")
- */
-export function formatTimeAgo(date: Date | string | null | undefined): string {
-  if (!date) return '';
-
-  const now = new Date();
-  const then = typeof date === 'string' ? new Date(date) : date;
-  const diffMs = now.getTime() - then.getTime();
-  const diffSeconds = Math.floor(diffMs / 1000);
-  const diffMinutes = Math.floor(diffSeconds / 60);
-  const diffHours = Math.floor(diffMinutes / 60);
-  const diffDays = Math.floor(diffHours / 24);
-  const diffWeeks = Math.floor(diffDays / 7);
-  const diffMonths = Math.floor(diffDays / 30);
-
-  if (diffSeconds < 60) {
-    return 'just now';
-  }
-
-  if (diffMinutes < 60) {
-    return diffMinutes === 1 ? '1 minute ago' : `${diffMinutes} minutes ago`;
-  }
-
-  if (diffHours < 24) {
-    return diffHours === 1 ? '1 hour ago' : `${diffHours} hours ago`;
-  }
-
-  if (diffDays < 7) {
-    return diffDays === 1 ? '1 day ago' : `${diffDays} days ago`;
-  }
-
-  if (diffWeeks < 4) {
-    return diffWeeks === 1 ? '1 week ago' : `${diffWeeks} weeks ago`;
-  }
-
-  if (diffMonths < 12) {
-    return diffMonths === 1 ? '1 month ago' : `${diffMonths} months ago`;
-  }
-
-  // For older dates, show the actual date
-  return then.toLocaleDateString();
-}