String timeAgo({required DateTime currentTime}) {
  final diff = DateTime.now().difference(currentTime);
  if (diff.inMinutes < 1) return 'Just now';
  if (diff.inHours < 1) return '${diff.inMinutes}m ago';
  if (diff.inDays < 1) return '${diff.inHours}h ago';
  return '${diff.inDays}d ago';
}