get_offset_post_link

function get_offset_post_link($format, $link, $offset, $post_type, $order_by, $custom_query_array){
    global $post;
    $current_post_id = $post->ID;

    $list_query = New WP_Query(array(
        'post_type'         => $post_type,
        'orderby'           => $order_by,
        'order'             => 'ASC',
        'posts_per_page'    => -1,
        'meta_query'        => $custom_query_array
     ));
    $i = 0;

    if ( $list_query->have_posts() ) while ( $list_query->have_posts() ) : $list_query->the_post();

        $item[$i] = get_post($post->ID);


        if($post->ID == $current_post_id){
            $target_index = $i + $offset;
            if($target_index >= 0){
                if($target_index <= $i){
                    $target_post =  $item[$target_index];
                    break;
                }else{
                    if($target_index <= $list_query->post_count){
                        while($i < $target_index){
                            $target_post = $list_query->next_post();
                            if($i == $target_index){
                                break;
                            }
                            $i++;
                        }
                    }else{
                        //offset exceeds the upper bounds of the record set.
                    }
                }
            }else{
                //offset exceeds the lower bounds of the record set.
            }
        }
        $i++;
    endwhile;


    wp_reset_query();
    wp_reset_postdata();

    if($target_post){
        $link = str_replace('%title', $target_post->post_title, $link);
        $link = '<a href="' . get_permalink($target_post->ID) . '">' . $link . '</a>';

        $format = str_replace('%link', $link, $format);

        return $format;
    }
}