Split post date format code snippets.

Code improvement

_data/date_format.yml

@@ -6,4 +6,6 @@
 
 
 tooltip: "%a, %b %e, %Y, %l:%M %p %z"
-post: "%b %e, %Y"
+post:
+  long: "%b %e, %Y"
+  short: "%b %e"

_includes/related-posts.html

@@ -93,10 +93,7 @@
       <div class="card">
         <a href="{{ post.url | relative_url }}">
           <div class="card-body">
-            <span class="timeago small">
-                {{ post.date | date: site.data.date_format.post }}
-                <i class="unloaded">{{ post.date | date_to_xmlschema }}</i>
-            </span>
+            {% include timeago.html date=post.date class="small" %}
             <h3 class="pt-0 mt-1 mb-3" data-toc-skip>{{ post.title }}</h3>
             <div class="text-muted small">
               <p>

_includes/timeago.html

@@ -0,0 +1,27 @@
+<!--
+  Date format snippet
+
+  v2.4.1
+  https://github.com/cotes2020/jekyll-theme-chirpy
+  © 2020 Cotes Chung
+  MIT License
+-->
+<span class="timeago {% if include.class %}{{ include.class }}{% endif %}"
+  {% if include.tooltip %}
+    data-toggle="tooltip"
+    data-placement="bottom"
+    title="{{ include.date | date: site.data.date_format.tooltip }}"
+  {% endif %}>
+
+  {% assign this_year = site.time | date: "%Y" %}
+  {% assign post_year = include.date | date: "%Y" %}
+
+  {% if post_year == this_year %}
+    {{ include.date | date: site.data.date_format.post.short }}
+  {% else %}
+    {{ include.date | date: site.data.date_format.post.long }}
+  {% endif %}
+
+  <i class="unloaded">{{ include.date | date_to_xmlschema }}</i>
+
+</span>

_layouts/category.html

@@ -18,7 +18,7 @@ layout: page
     <li class="d-flex justify-content-between pl-md-3 pr-md-3">
       <a href="{{ post.url | relative_url }}">{{ post.title }}</a>
       <span class="dash flex-grow-1"></span>
-      <span class="text-muted small">{{ post.date | date: site.data.date_format.post }}</span>
+      <span class="text-muted small">{{ post.date | date: site.data.date_format.post.long }}</span>
     </li>
     {% endfor %}
   </ul>

_layouts/home.html

@@ -66,11 +66,8 @@ layout: page
     <div class="post-meta text-muted">
       <!-- posted date -->
       <i class="far fa-clock fa-fw"></i>
-      <span class="timeago" data-toggle="tooltip" data-placement="bottom"
-        title="{{ post.date | date: site.data.date_format.tooltip }}">
-      {{ post.date | date: site.data.date_format.post }}
-      <i class="unloaded">{{ post.date | date_to_xmlschema }}</i>
-      </span>
+      {% include timeago.html date=post.date tooltip=true %}
+
       <!-- page views -->
       {% if site.google_analytics.pv.enabled %}
       <i class="far fa-eye fa-fw"></i>

_layouts/post.html

@@ -19,11 +19,7 @@ layout: default
         <!-- Published date and author -->
         <div>
           Posted
-          <span class="timeago" data-toggle="tooltip" data-placement="bottom"
-           title="{{ page.date | date: site.data.date_format.tooltip }}">
-            {{ page.date | date: site.data.date_format.post }}
-            <i class="unloaded">{{ page.date | date_to_xmlschema }}</i>
-          </span>
+          {% include timeago.html date=page.date tooltip=true %}
           by
           <span class="author">
           {% if page.author %}
@@ -50,12 +46,7 @@ layout: default
         {% if lastmod %}
         <div>
           Updated
-          <span class="timeago lastmod"
-            data-toggle="tooltip" data-placement="bottom"
-             title="{{ lastmod | date: site.data.date_format.tooltip }}">
-            {{ lastmod | date: site.data.date_format.post }}
-            <i class="unloaded">{{ lastmod | date_to_xmlschema}}</i>
-          </span>
+          {% include timeago.html date=lastmod class="lastmod" tooltip=true %}
         </div>
         {% endif %}
 

_layouts/tag.html

@@ -18,7 +18,7 @@ layout: page
     <li class="d-flex justify-content-between pl-md-3 pr-md-3">
       <a href="{{ post.url | relative_url }}">{{ post.title }}</a>
       <span class="dash flex-grow-1"></span>
-      <span class="text-muted small">{{ post.date | date: site.data.date_format.post }}</span>
+      <span class="text-muted small">{{ post.date | date: site.data.date_format.post.long }}</span>
     </li>
     {% endfor %}
   </ul>