Add function that looks for all blogs

astro/src/lib/dates.ts

@@ -0,0 +1,6 @@
+export function formatDate(date: Date, format: string) {
+    return format
+        .replaceAll("%Y", date.getFullYear().toString())
+        .replaceAll("%M", (date.getMonth() + 1).toString().padStart(2, '0'))
+        .replaceAll("%D", date.getDate().toString().padStart(2, '0'));
+}