Initial commit: KOC LOOP platform

lib/date-utils.ts

@@ -0,0 +1,26 @@
+export function parseStoredDate(value: string) {
+  const trimmed = value.trim();
+  const normalized = /^\d{4}-\d{2}-\d{2}$/.test(trimmed)
+    ? `${trimmed}T00:00:00+08:00`
+    : /^\d{4}-\d{2}-\d{2}[ T]\d{2}:\d{2}(?::\d{2}(?:\.\d+)?)?$/.test(
+          trimmed,
+        )
+      ? `${trimmed.replace(" ", "T")}Z`
+      : trimmed;
+  return new Date(normalized);
+}
+
+export function formatShanghaiDate(
+  value: string | null | undefined,
+  withTime = false,
+) {
+  if (!value) return "—";
+  const date = parseStoredDate(value);
+  if (Number.isNaN(date.getTime())) return value;
+  return new Intl.DateTimeFormat("zh-CN", {
+    timeZone: "Asia/Shanghai",
+    month: "2-digit",
+    day: "2-digit",
+    ...(withTime ? { hour: "2-digit", minute: "2-digit" } : {}),
+  }).format(date);
+}