{{ $date := .Date | time.Format (site.Params.dateformat | default "January 02, 2006") }}
{{ $lastmod := .Lastmod | time.Format (site.Params.dateformat | default "January 02, 2006") }}

<time datetime="{{ .Date.Format "2006-01-02T15:04:05Z07:00" }}">
    {{ $date }}
</time>

{{/* Check that lastmod exists and is greater than date
    (i.e. the last modified date must be after the publish date) */}}
{{ if and (ne $lastmod $date) (gt .Lastmod .Date) }}
    <time datetime="{{ .Lastmod.Format "2006-01-02T15:04:05Z07:00" }}">
        ({{ i18n "updated_at" }} {{ $lastmod }})
    </time>
{{ end }}