Improve post template handling of dates and authors

_layouts/post.html

@@ -7,18 +7,20 @@ layout: default
     <h1 class="post-title p-name" itemprop="name headline">{{ page.title | escape }}</h1>
     <p class="post-meta">
       {%- assign date_format = site.minima.date_format | default: "%b %-d, %Y" -%}
-      <time class="dt-published" datetime="{{ page.date | date_to_xmlschema }}" itemprop="datePublished">
+      <time class="dt-published" datetime="{{ page.date | date_to_xmlschema }}" itemprop="datePublished">Published: {{ page.date | date: date_format }}</time></br>
-      {{ page.date | date: date_format }}
+      {%- if page.last_modified_at -%}
-      </time>
+        {%- assign mdate = page.last_modified_at | date_to_xmlschema -%}
-      {%- if page.modified_date -%}
+        <time class="dt-modified" datetime="{{ mdate }}" itemprop="dateModified">Updated: {{ mdate | date: date_format }}</time>
-        ~
-        {%- assign mdate = page.modified_date | date_to_xmlschema -%}
-        <time class="dt-modified" datetime="{{ mdate }}" itemprop="dateModified">
-          {{ mdate | date: date_format }}
-        </time>
       {%- endif -%}
+    </br>
       {%- if page.author -%}
-      Author(s): {% for author in page.author -%}
+      {% for author in page.author -%}{%- assign author_count = author_count | plus: 1 -%}{% endfor %}
+      {%- if author_count==1 -%}
+      Author
+      {%- else -%}
+      Authors
+      {%- endif -%}
+      : {% for author in page.author -%}
           <span itemprop="author" itemscope itemtype="http://schema.org/Person"><span class="p-author h-card" itemprop="name">{{ author }}</span></span>
             {%- if forloop.last == false %}, {% endif -%}
         {% endfor %}