immich/mobile/lib/extensions/datetime_extensions.dart

extension TimeAgoExtension on DateTime {
  String timeAgo({bool numericDates = true}) {
    DateTime date = toLocal();
    final date2 = DateTime.now().toLocal();
    final difference = date2.difference(date);

    if (difference.inSeconds < 5) {
      return 'Just now';
    } else if (difference.inSeconds < 60) {
      return '${difference.inSeconds} seconds ago';
    } else if (difference.inMinutes <= 1) {
      return (numericDates) ? '1 minute ago' : 'A minute ago';
    } else if (difference.inMinutes < 60) {
      return '${difference.inMinutes} minutes ago';
    } else if (difference.inHours <= 1) {
      return (numericDates) ? '1 hour ago' : 'An hour ago';
    } else if (difference.inHours < 60) {
      return '${difference.inHours} hours ago';
    } else if (difference.inDays <= 1) {
      return (numericDates) ? '1 day ago' : 'Yesterday';
    } else if (difference.inDays < 6) {
      return '${difference.inDays} days ago';
    } else if ((difference.inDays / 7).ceil() <= 1) {
      return (numericDates) ? '1 week ago' : 'Last week';
    } else if ((difference.inDays / 7).ceil() < 4) {
      return '${(difference.inDays / 7).ceil()} weeks ago';
    } else if ((difference.inDays / 30).ceil() <= 1) {
      return (numericDates) ? '1 month ago' : 'Last month';
    } else if ((difference.inDays / 30).ceil() < 30) {
      return '${(difference.inDays / 30).ceil()} months ago';
    } else if ((difference.inDays / 365).ceil() <= 1) {
      return (numericDates) ? '1 year ago' : 'Last year';
    }
    return '${(difference.inDays / 365).floor()} years ago';
  }
}