<ul class="pinned-posts">
{% for posts in site.posts %}
  {% for post in site.pinpost %}
    {% if posts.title == post %}
      <li style="margin-bottom: 1em">
        {%- assign date_format = site.minima.date_format | default: "%b %-d, %Y" -%}
        <span class="post-meta" title="{{ posts.date }}">{{ posts.date | date: date_format }}</span>
        <h3 style="margin:0">
          <a class="post-link" href="{{ posts.url | relative_url }}">
            {{ posts.title | escape }}
          </a>
        </h3>
      {% endif %}
      </li>
  {% endfor %}
{% endfor %}
</ul>