{{- $oldest := (index .Site.RegularPages.ByDate 0).Date.Year }}
{{- $newest := (index .Site.Pages.ByLastmod.Reverse 0).Lastmod.Year }}
{{- if gt $newest $oldest }}
  Copyright {{ $oldest }}–{{ $newest }}
{{- else }}
  Copyright {{ $newest }}
{{- end }}
{{- with .Site.Params.author.name -}}
  , {{ . }}
{{- end -}}
.