thor/defaults/layouts/section_index.html

{{<base}}
{{$content}}
<main>
  <h1>{{page_title}}</h1>
  {{&body}}
  {{#year_sections}}
  <section>
    <h2>{{year}}</h2>
    <ul>
      {{#posts}} <li><a href="{{permalink}}">{{&title}}</a><span>{{#date_iso}}<time
            datetime="{{date_iso}}">{{date_display}}</time>{{/date_iso}}</span>
      </li>
      {{/posts}}
    </ul>
  </section>
  {{/year_sections}}
</main>
{{/content}}
{{/base}}