this is my simple solution for german date format as partial
date.html
{{ $month_names := slice "Januar" "Februar" "März" "April" "Mai" "Juni" "Juli" "August" "September" "Oktober" "November" "Dezember" }}
{{ $month := sub .Date.Month 1 }}
{{ .Date.Day }}. {{ index $month_names $month }} {{ .Date.Year }}