Add recovery Excel export and automatic account detection

lib/date-utils.ts

@@ -24,3 +24,16 @@ export function formatShanghaiDate(
     ...(withTime ? { hour: "2-digit", minute: "2-digit" } : {}),
   }).format(date);
 }
+
+export function formatShanghaiToday(value: Date | number = Date.now()) {
+  const date = value instanceof Date ? value : new Date(value);
+  const parts = new Intl.DateTimeFormat("zh-CN", {
+    timeZone: "Asia/Shanghai",
+    month: "numeric",
+    day: "numeric",
+  }).formatToParts(date);
+  const calendar = Object.fromEntries(
+    parts.map((part) => [part.type, part.value]),
+  );
+  return `${calendar.month}月${calendar.day}日`;
+}