fix: Use ISO date format

src/lib/components/PostHeader.svelte

@@ -3,7 +3,7 @@
 	export let metadata : { title: string, description: string, tags: [string], date: Date };
 
 	export let link: Option<string> = null;
-	const date = metadata.date.toLocaleDateString();
+	const date = metadata.date.toISOString().slice(0,-14);
 </script>
 
 <div id="post-heading">