See the change of get_permalink
to the_permalink
This might work for you.
<?php
$args = array( 'numberposts' => 5, 'order'=> 'ASC', 'orderby' => 'date' );
$postslist = get_posts( $args );
foreach ($postslist as $post) : setup_postdata($post); ?>
<div class="single_post">
<h3><?php the_date(); ?></h3>
<h3>
<a href="https://wordpress.stackexchange.com/questions/109174/<?php the_permalink();?>">
<?php the_title(); ?>
</a>
</h3>
<?php the_excerpt(); ?>
</div>
<?php endforeach; ?>