Variable: nnfeed-date-format
nnfeed-date-format is a customizable variable defined in nnfeed.el.gz.
Value
"%F %X%p"
Documentation
Format of displayed dates (see function format-time-string).
This variable was added, or its default value changed, in Emacs 30.1.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/nnfeed.el.gz
(defcustom nnfeed-date-format "%F %X%p"
"Format of displayed dates (see function `format-time-string')."
:version "30.1"
:type 'string)