app/themes/hugo-theme-stack/layouts/partials/article/components/footer.html

<footer class="article-footer">
    {{ partial "article/components/tags" . }}

    {{ if and (.Site.Params.article.license.enabled) (not (eq .Params.license false)) }}
    <section class="article-copyright">
        {{ partial "helper/icon" "copyright" }}
        <span>{{ default .Site.Params.article.license.default .Params.license | markdownify }}</span>
    </section>
    {{ end }}

    {{- if ne .Lastmod .Date -}}
    <section class="article-lastmod">
        {{ partial "helper/icon" "clock" }}
        <span>
            {{ T "article.lastUpdatedOn" }} {{ .Lastmod | time.Format ( or .Site.Params.dateFormat.lastUpdated "Jan 02, 2006 15:04 MST" ) }}
        </span>
    </section>
    {{- end -}}
</footer>