Variable: todo-time-string-format
todo-time-string-format is a customizable variable defined in
otodo-mode.el.gz.
Value
"%:y-%02m-%02d %02H:%02M"
Documentation
TODO mode time string format for done entries.
For details see the variable time-stamp-format.
Source Code
;; Defined in /usr/src/emacs/lisp/obsolete/otodo-mode.el.gz
;; Thanks for the ISO time stamp format go to Karl Eichwalder <ke@suse.de>
;; My format string for the appt.el package is "%3b %2d, %y, %02I:%02M%p".
;;
(defcustom todo-time-string-format
"%:y-%02m-%02d %02H:%02M"
"TODO mode time string format for done entries.
For details see the variable `time-stamp-format'."
:type 'string)