Jekyll post archive, organized by year headings.

jekyll-archive-chron-by-year.html

{% for post in site.posts %}
  {% capture year %}{{ post.date | date: '%Y' }}{% endcapture %}
  {% capture nyear %}{{ post.next.date | date: '%Y' }}{% endcapture %}
    {% if year != nyear %}
      {% if forloop.index0 != 0 %}
        </ul>
      {% endif %}
        <h2>{{ post.date | date: '%Y' }}</h2><ul>
    {% endif %}
  <li><a href="{{ post.url }}">{{ post.title }}</a><br><time datetime="{{ post.date | date: "%Y-%m-%d" }}T{{ post.date | date: "%H:%M" }}">{{ post.date | date: "%B %d, %Y" }}</time></li>
{% endfor %}