export function timeAgo(iso: string): string {
  const now = Date.now()
  const then = new Date(iso).getTime()
  const diff = Math.floor((now - then) / 1000)

  if (diff < 60) return 'just now'
  if (diff < 3600) {
    const m = Math.floor(diff / 60)
    return `${m} minute${m !== 1 ? 's' : ''} ago`
  }
  if (diff < 86400) {
    const h = Math.floor(diff / 3600)
    return `${h} hour${h !== 1 ? 's' : ''} ago`
  }
  const d = Math.floor(diff / 86400)
  return `${d} day${d !== 1 ? 's' : ''} ago`
}