Fixed:

1.  Incorrect heading for previous year's posts in archive.md tocttou#1
2.  Blog year in footer (switched to current year from site.year

_config.yml

@@ -29,4 +29,4 @@ plugins:
 
 # Custom variables
 owner : "SomeHacker"
-year : "2017"
+year : "2018"

_includes/footer.html

@@ -3,6 +3,7 @@
     <span>
         <b>{{ site.owner}}</b>
     </span>
-    <span>© {{ site.year }}</span>
+    {% capture currentyear %}{{ 'now' | date: "%Y" }}{% endcapture %}
+    <span>© {{ currentyear }}</span>
   </a>
 </footer>

archive.md

@@ -4,22 +4,31 @@ title: Archive
 ---
 
 <section>
-  <h3>This year's posts</h3>
-  {%for post in site.posts %}
-    {% unless post.next %}
-      <ul>
-    {% else %}
-      {% capture year %}{{ post.date | date: '%Y' }}{% endcapture %}
-      {% capture nyear %}{{ post.next.date | date: '%Y' }}{% endcapture %}
-      {% if year != nyear %}
-        </ul>
-        <h3>{{ post.date | date: '%Y' }}</h3>
-        <ul>
-      {% endif %}
-    {% endunless %}
-      <li><time>{{ post.date | date:"%d %b" }} - </time><a href="{{ post.url }}">{{ post.title }}</a></li>
-  {% endfor %}
-  </ul>
-</section>
+  {% if site.posts[0] %}
+
+    {% capture currentyear %}{{ 'now' | date: "%Y" }}{% endcapture %}
+    {% capture firstpostyear %}{{ site.posts[0].date | date: '%Y' }}{% endcapture %}
+    {% if currentyear == firstpostyear %}
+        <h3>This year's posts</h3>
+    {% else %}  
+        <h3>{{ firstpostyear }}</h3>
+    {% endif %}
 
+    {%for post in site.posts %}
+      {% unless post.next %}
+        <ul>
+      {% else %}
+        {% capture year %}{{ post.date | date: '%Y' }}{% endcapture %}
+        {% capture nyear %}{{ post.next.date | date: '%Y' }}{% endcapture %}
+        {% if year != nyear %}
+          </ul>
+          <h3>{{ post.date | date: '%Y' }}</h3>
+          <ul>
+        {% endif %}
+      {% endunless %}
+        <li><time>{{ post.date | date:"%d %b" }} - </time><a href="{{ post.url }}">{{ post.title }}</a></li>
+    {% endfor %}
+    </ul>
 
+  {% endif %}
+</section>