brainbaking/layouts/shortcodes/archive.html

{{ $year := index .Params 0 }}

<div class="list">
	<h2>{{ $year }}</h2>

	{{ range (where (where $.Site.Pages "Section" "post") ".Params.date.Year" "eq" $year).GroupByDate "Jan" }}
    	<h3>{{ .Key }}</h3>

		{{ partial "list-ul" . }}
    {{ end }}

</div>