fix: use the correct date

_includes/postslist.njk

@@ -5,7 +5,7 @@
           <a href="{{ post.url }}" class="postlist-link">{% if post.data.title %}{{ post.data.title }}{% else %}<code>{{ post.url }}</code>{% endif %}</a>
         </h2>
         <ul class="post-metadata">
-          <li><time datetime="{{ page.date | htmlDateString }}">{{ page.date | readableDate }}</time></li>
+          <li><time datetime="{{ post.data.date | htmlDateString }}">{{ post.data.date | readableDate }}</time></li>
           {%- for tag in post.data.tags | filterTagList %}
             {%- set tagUrl %}/tags/{{ tag | slugify }}/{% endset %}
             <li><a href="{{ tagUrl }}" class="post-tag">#{{ tag }}</a>{%- if not loop.last %} {% endif %}</li>