hugo-book-theme/layouts/partials/docs/post-meta.html

{{ $dateFormat := (default "January 2, 2006" .Site.Params.BookDateFormat) }}
{{ with .Date}}
  <h5>{{ .Format $dateFormat }}</h5>
{{ end }}

{{ range $taxonomy, $_ := .Site.Taxonomies }}
  {{ with $terms := $.GetTerms $taxonomy }}
  <div>
    {{ range $n, $term := $terms }}{{ if $n }}, {{ end }}
        <a href="{{ $term.RelPermalink }}">{{ $term.Title }}</a>
    {{- end }}
  </div>
  {{ end }}
{{ end }}