diff --git a/_config.yml b/_config.yml
index 9c0e053c90c7..fe3085def58d 100644
--- a/_config.yml
+++ b/_config.yml
@@ -171,6 +171,9 @@ excerpt_length: 50
 # and RSS feed title
 title-separator: "-"
 
+# Ruby Date Format
+date_format: "%B %-d, %Y"
+
 # --- Don't need to touch anything below here (but you can if you want) --- #
 
 # Output options (more information on Jekyll's site)
diff --git a/_includes/header.html b/_includes/header.html
index 1fea242c6e54..5338f226a5f2 100644
--- a/_includes/header.html
+++ b/_includes/header.html
@@ -36,7 +36,7 @@ <h2 class="{{ include.type }}-subheading">{{ page.subtitle }}</h2>
 		  {% endif %}
 		  
 		  {% if include.type == "post" %}
-		  <span class="post-meta">Posted on {{ page.date | date: "%B %-d, %Y" }}</span>
+		  <span class="post-meta">Posted on {{ page.date | date: site.date_format }}</span>
 		  {% endif %}
         </div>
       </div>
@@ -61,7 +61,7 @@ <h2 class="{{ include.type }}-subheading">{{ page.subtitle }}</h2>
 		  {% endif %}
 		  
 		  {% if include.type == "post" %}
-		  <span class="post-meta">Posted on {{ page.date | date: "%B %-d, %Y" }}</span>
+		  <span class="post-meta">Posted on {{ page.date | date: site.date_format }}</span>
 		  {% endif %}
         </div>
       </div>
diff --git a/tags.html b/tags.html
index 1f40c71a0864..b42ef876c4da 100644
--- a/tags.html
+++ b/tags.html
@@ -25,7 +25,7 @@ <h2 id="{{- tag -}}" class="linked-section">
             <div class="tag-entry">
                 <a href="{{ post.url | relative_url }}">{{- post.title -}}</a>
                 <div class="entry-date">
-                    <time datetime="{{- post.date | date_to_xmlschema -}}">{{- post.date | date: "%B %d, %Y" -}}</time>
+                    <time datetime="{{- post.date | date_to_xmlschema -}}">{{- post.date | date: site.date_format -}}</time>
                 </div>
             </div>
         {%- endfor -%}