diff --git a/quartz/components/Date.tsx b/quartz/components/Date.tsx
index 0a92cc4c3..e21c9477d 100644
--- a/quartz/components/Date.tsx
+++ b/quartz/components/Date.tsx
@@ -27,5 +27,5 @@ export function formatDate(d: Date, locale: ValidLocale = "en-US"): string {
 }
 
 export function Date({ date, locale }: Props) {
-  return <time datetime={date.toISOString()}>{formatDate(date, locale)}</time>
+  return <time datetime={formatDate(date)}>{formatDate(date, locale)}</time>
 }