(defcustom gnus-article-date-headers '(combined-lapsed)
"A list of Date header formats to display.
-Valid formats are `ut' (universal time), `local' (local time
+Valid formats are `ut' (Universal Time), `local' (local time
zone), `english' (readable English), `lapsed' (elapsed time),
`combined-lapsed' (both the original date and the elapsed time),
`original' (the original date header), `iso8601' (ISO8601