Variable: rcirc-time-format
rcirc-time-format is a customizable variable defined in rcirc.el.gz.
Value
"%H:%M "
Documentation
Describes how timestamps are printed.
Used as the first arg to format-time-string.
Source Code
;; Defined in /usr/src/emacs/lisp/net/rcirc.el.gz
(defcustom rcirc-time-format "%H:%M "
"Describes how timestamps are printed.
Used as the first arg to `format-time-string'."
:type 'string)