Use date_format if set in configuration (jekyll#70)

Merge pull request 70

Author: ward

README.md

@@ -46,6 +46,20 @@ The site's default CSS has now moved to a new place within the gem itself, [`ass
 
 --
 
+### Change default date format
+
+You can change the default date format by specifying `site.minima.date_format`
+in `_config.yml`.
+
+```
+# Minima date format
+# refer to http://shopify.github.io/liquid/filters/date/ if you want to customize this
+minima:
+  date_format: "%b %-d, %Y"
+```
+
+--
+
 ### Enabling comments (via Disqus)
 
 Optionally, if you have a Disqus account, you can tell Jekyll to use it to show a comments section below each post.

_layouts/home.html

@@ -11,7 +11,8 @@ <h1 class="page-heading">Posts</h1>
   <ul class="post-list">
     {% for post in site.posts %}
       <li>
-        <span class="post-meta">{{ post.date | date: "%b %-d, %Y" }}</span>
+        {% assign date_format = site.minima.date_format | default: "%b %-d, %Y" %}
+        <span class="post-meta">{{ post.date | date: date_format }}</span>
 
         <h2>
           <a class="post-link" href="{{ post.url | relative_url }}">{{ post.title | escape }}</a>

_layouts/post.html

@@ -5,7 +5,14 @@
 
   <header class="post-header">
     <h1 class="post-title" itemprop="name headline">{{ page.title | escape }}</h1>
-    <p class="post-meta"><time datetime="{{ page.date | date_to_xmlschema }}" itemprop="datePublished">{{ page.date | date: "%b %-d, %Y" }}</time>{% if page.author %} • <span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name">{{ page.author }}</span></span>{% endif %}</p>
+    <p class="post-meta">
+      <time datetime="{{ page.date | date_to_xmlschema }}" itemprop="datePublished">
+        {% assign date_format = site.minima.date_format | default: "%b %-d, %Y" %}
+        {{ page.date | date: date_format }}
+      </time>
+      {% if page.author %}
+        • <span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name">{{ page.author }}</span></span>
+      {% endif %}</p>
   </header>
 
   <div class="post-content" itemprop="articleBody">

example/_config.yml

@@ -19,6 +19,11 @@ stackoverflow_username: stackoverflow
 youtube_username: youtube
 googleplus_username: google+
 
+# Minima date format
+# refer to http://shopify.github.io/liquid/filters/date/ if you want to customize this
+minima:
+  date_format: "%b %-d, %Y"
+
 # If you want to link only specific pages in your header, uncomment
 # this and add the path to the pages in order as they should show up
 #header_pages: