// Backend datetime values are stored as UTC. Older records omit the timezone suffix.
export function formatDateTime(value, options = {}) {
  if (!value) return "--";
  const raw = String(value);
  const normalized = /(?:Z|[+-]\d{2}:?\d{2})$/i.test(raw) ? raw : `${raw}Z`;
  const date = new Date(normalized);
  if (Number.isNaN(date.getTime())) return "--";
  return date.toLocaleString("zh-CN", {
    hour12: false,
    timeZone: "Asia/Shanghai",
    ...options,
  });
}