// Format timestamp to readable date
  export function formatDate(timestamp: number) {
    const date = new Date(timestamp);
    const now = new Date();
    const isToday = date.toDateString() === now.toDateString();
    
    if (isToday) {
      return date.toLocaleTimeString('zh-CN', { hour: '2-digit', minute: '2-digit' });
    } else {
      return date.toLocaleDateString('zh-CN', { month: 'short', day: 'numeric' });
    }
  };