{{ $lastBuildTime := time "2021-09-08T12:51:38-0400" }}
{{ $updatedPosts := slice }}

{{ range .Site.Pages }}
    {{ if .Lastmod.After $lastBuildTime }}
        <li>{{ .Title }} - {{ .Lastmod }}</li>
    {{ end }}
{{ end }}

<h2>Updated Posts:</h2>
<ul>
    {{ range $updatedPosts }}
        <li>{{ . }}</li>
    {{ end }}
</ul>

{{ $currentTime := now.UTC }}