export function formatDate(dateString) {
  if (!dateString) return '未知时间'
  
  const date = new Date(dateString)
  
  // 处理无效日期
  if (isNaN(date.getTime())) return dateString
  
  const year = date.getFullYear()
  const month = String(date.getMonth() + 1).padStart(2, '0')
  const day = String(date.getDate()).padStart(2, '0')
  const hours = String(date.getHours()).padStart(2, '0')
  const minutes = String(date.getMinutes()).padStart(2, '0')
  
  return `${year}-${month}-${day} ${hours}:${minutes}`
}