diff --git a/src/components/ArticlePreview.tsx b/src/components/ArticlePreview.tsx
index 6e5cd30..d56bfae 100644
--- a/src/components/ArticlePreview.tsx
+++ b/src/components/ArticlePreview.tsx
@@ -7,6 +7,7 @@ import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
 import { Calendar } from 'lucide-react';
 import { useAuthor } from '@/hooks/useAuthor';
 import { genUserName } from '@/lib/genUserName';
+import { isValidDate, toISOStringSafe } from '@/lib/date';
 
 interface ArticlePreviewProps {
   post: NostrEvent;
@@ -48,6 +49,8 @@ export function ArticlePreview({ post, variant = 'default', showAuthor = true }:
     ? { month: 'short', day: 'numeric', year: 'numeric' }
     : { year: 'numeric', month: 'long', day: 'numeric' };
 
+  const valid = isValidDate(date);
+
   return (
     <Link to={`/${naddr}`}>
       <Card className="overflow-hidden hover:shadow-lg transition-shadow h-full flex flex-col">
@@ -71,12 +74,14 @@ export function ArticlePreview({ post, variant = 'default', showAuthor = true }:
           )}
         </CardHeader>
         <CardContent className="pt-0">
-          <div className={`flex items-center gap-2 text-xs text-muted-foreground ${showAuthor || hashtags.length > 0 ? 'mb-3' : ''}`}>
-            <Calendar className="h-3 w-3" />
-            <time dateTime={date.toISOString()}>
-              {date.toLocaleDateString('en-US', dateFormat as Intl.DateTimeFormatOptions)}
-            </time>
-          </div>
+          {valid && (
+            <div className={`flex items-center gap-2 text-xs text-muted-foreground ${showAuthor || hashtags.length > 0 ? 'mb-3' : ''}`}>
+              <Calendar className="h-3 w-3" />
+              <time dateTime={toISOStringSafe(date)}>
+                {date.toLocaleDateString('en-US', dateFormat as Intl.DateTimeFormatOptions)}
+              </time>
+            </div>
+          )}
           {showAuthor && (
             <div className={`flex items-center gap-2 ${hashtags.length > 0 ? 'mb-3' : ''}`}>
               <Avatar className="h-6 w-6">
diff --git a/src/components/ArticleView.tsx b/src/components/ArticleView.tsx
index 3c1ccba..6274ac7 100644
--- a/src/components/ArticleView.tsx
+++ b/src/components/ArticleView.tsx
@@ -17,6 +17,7 @@ import { Separator } from '@/components/ui/separator';
 import { Calendar, Heart, Edit, ArrowLeft, Share2, Check, Code } from 'lucide-react';
 import { genUserName } from '@/lib/genUserName';
 import { calculateReadingTime } from '@/lib/calculateReadingTime';
+import { isValidDate, toISOStringSafe } from '@/lib/date';
 import { useToast } from '@/hooks/useToast';
 import { useState } from 'react';
 import {
@@ -108,6 +109,8 @@ export function ArticleView({ post }: ArticleViewProps) {
     }
   };
 
+  const validDate = isValidDate(date);
+
   return (
     <div className="min-h-screen">
       <ArticleProgressBar />
@@ -144,16 +147,18 @@ export function ArticleView({ post }: ArticleViewProps) {
               </Avatar>
               <div>
                 <div className="font-semibold">{displayName}</div>
-                <div className="flex items-center gap-2 text-sm text-muted-foreground">
-                  <Calendar className="h-3 w-3" />
-                  <time dateTime={date.toISOString()}>
-                    {date.toLocaleDateString('en-US', {
-                      year: 'numeric',
-                      month: 'long',
-                      day: 'numeric',
-                    })}
-                  </time>
-                </div>
+                {validDate && (
+                  <div className="flex items-center gap-2 text-sm text-muted-foreground">
+                    <Calendar className="h-3 w-3" />
+                    <time dateTime={toISOStringSafe(date)}>
+                      {date.toLocaleDateString('en-US', {
+                        year: 'numeric',
+                        month: 'long',
+                        day: 'numeric',
+                      })}
+                    </time>
+                  </div>
+                )}
               </div>
             </Link>
 
diff --git a/src/lib/date.ts b/src/lib/date.ts
new file mode 100644
index 0000000..97f7533
--- /dev/null
+++ b/src/lib/date.ts
@@ -0,0 +1,13 @@
+export function isValidDate(date: Date | null | undefined): boolean {
+  if (!date) return false;
+  return !isNaN(date.getTime());
+}
+
+export function toISOStringSafe(date: Date | null | undefined): string {
+  if (!isValidDate(date as Date)) return "";
+  try {
+    return (date as Date).toISOString();
+  } catch {
+    return "";
+  }
+}
diff --git a/src/pages/ArticlePage.tsx b/src/pages/ArticlePage.tsx
index d95926e..82bd466 100644
--- a/src/pages/ArticlePage.tsx
+++ b/src/pages/ArticlePage.tsx
@@ -7,6 +7,7 @@ import { ArticleView } from '@/components/ArticleView';
 import { Skeleton } from '@/components/ui/skeleton';
 import NotFound from '@/pages/NotFound';
 import { genUserName } from '@/lib/genUserName';
+import { toISOStringSafe } from '@/lib/date';
 
 export default function ArticlePage() {
   const { nip19: naddr } = useParams<{ nip19: string }>();
@@ -71,11 +72,16 @@ export default function ArticlePage() {
     ogImage: image || `${siteUrl}/icon-512.png`,
     ogSiteName: 'zelo.news',
     // Article-specific OG tags
-    ...(post && isValidNaddr && {
-      articlePublishedTime: date.toISOString(),
-      articleAuthor: [authorName],
-      ...(hashtags.length > 0 && { articleTag: hashtags }),
-    }),
+    ...(post && isValidNaddr && (() => {
+      const iso = toISOStringSafe(date);
+      return iso
+        ? {
+            articlePublishedTime: iso,
+            articleAuthor: [authorName],
+            ...(hashtags.length > 0 && { articleTag: hashtags }),
+          }
+        : {};
+    })()),
     // Twitter Card tags
     twitterCard: 'summary_large_image',
     twitterTitle: title,
diff --git a/src/pages/EventPage.tsx b/src/pages/EventPage.tsx
index c8a1687..b5727d2 100644
--- a/src/pages/EventPage.tsx
+++ b/src/pages/EventPage.tsx
@@ -13,6 +13,7 @@ import { ArrowLeft, Calendar, Hash } from 'lucide-react';
 import { genUserName } from '@/lib/genUserName';
 import type { NostrEvent } from '@nostrify/nostrify';
 import NotFound from './NotFound';
+import { isValidDate, toISOStringSafe } from '@/lib/date';
 
 interface EventPageProps {
   eventId: string;
@@ -118,6 +119,7 @@ export function EventPage({ eventId, relayHints, authorPubkey, kind }: EventPage
   }
 
   const date = new Date(event.created_at * 1000);
+  const validDate = isValidDate(date);
 
   return (
     <div className="min-h-screen">
@@ -141,19 +143,21 @@ export function EventPage({ eventId, relayHints, authorPubkey, kind }: EventPage
                 <Hash className="h-3 w-3" />
                 Kind {event.kind}
               </Badge>
-              <time 
-                dateTime={date.toISOString()}
-                className="text-sm text-muted-foreground flex items-center gap-1"
-              >
-                <Calendar className="h-3 w-3" />
-                {date.toLocaleDateString('en-US', {
-                  year: 'numeric',
-                  month: 'long',
-                  day: 'numeric',
-                  hour: '2-digit',
-                  minute: '2-digit',
-                })}
-              </time>
+              {validDate && (
+                <time 
+                  dateTime={toISOStringSafe(date)}
+                  className="text-sm text-muted-foreground flex items-center gap-1"
+                >
+                  <Calendar className="h-3 w-3" />
+                  {date.toLocaleDateString('en-US', {
+                    year: 'numeric',
+                    month: 'long',
+                    day: 'numeric',
+                    hour: '2-digit',
+                    minute: '2-digit',
+                  })}
+                </time>
+              )}
             </div>
 
             <Link 
diff --git a/src/pages/NotePage.tsx b/src/pages/NotePage.tsx
index 5a759f6..55e1e19 100644
--- a/src/pages/NotePage.tsx
+++ b/src/pages/NotePage.tsx
@@ -18,6 +18,7 @@ import { Heart, MessageCircle, ArrowLeft } from 'lucide-react';
 import { genUserName } from '@/lib/genUserName';
 import type { NostrEvent } from '@nostrify/nostrify';
 import NotFound from './NotFound';
+import { isValidDate, toISOStringSafe } from '@/lib/date';
 
 interface NotePageProps {
   eventId: string;
@@ -117,6 +118,7 @@ export function NotePage({ eventId }: NotePageProps) {
   }
 
   const date = new Date(note.created_at * 1000);
+  const validDate = isValidDate(date);
 
   return (
     <div className="min-h-screen">
@@ -145,18 +147,20 @@ export function NotePage({ eventId }: NotePageProps) {
               </Avatar>
               <div>
                 <div className="font-semibold">{displayName}</div>
-                <time 
-                  dateTime={date.toISOString()}
-                  className="text-sm text-muted-foreground"
-                >
-                  {date.toLocaleDateString('en-US', {
-                    year: 'numeric',
-                    month: 'long',
-                    day: 'numeric',
-                    hour: '2-digit',
-                    minute: '2-digit',
-                  })}
-                </time>
+                {validDate && (
+                  <time 
+                    dateTime={toISOStringSafe(date)}
+                    className="text-sm text-muted-foreground"
+                  >
+                    {date.toLocaleDateString('en-US', {
+                      year: 'numeric',
+                      month: 'long',
+                      day: 'numeric',
+                      hour: '2-digit',
+                      minute: '2-digit',
+                    })}
+                  </time>
+                )}
               </div>
             </Link>
           </CardHeader>