Codex fixes

lib/format.ts

@@ -0,0 +1,10 @@
+const postDateFormatter = new Intl.DateTimeFormat('en-US', {
+  month: 'long',
+  day: 'numeric',
+  year: 'numeric',
+  timeZone: 'UTC',
+});
+
+export function formatPostDate(date: string) {
+  return postDateFormatter.format(new Date(date));
+}