Jekyll for archive list

index.html

{% for post in site.posts %}
  {% capture month %}{{ post.date | date: '%m%Y' }}{% endcapture %}
  {% capture nmonth %}{{ post.next.date | date: '%m%Y' }}{% endcapture %}
  {% if month != nmonth %}
  <li class="list-item">
    <a href="/{{ post.date | date: '%Y/%m/' }}">
      <span class="item-year" title="{{ post.date | date: '%Y年' }}">{{ post.date | date: '%Y' }}</span>
      <span class="item-month" title="{{ post.date | date: '%m月' }}">{{ post.date | date: '%m' }}</span>
    </a>
  </li>
  {% endif %}
{% endfor %}