Variable: dired-copy-preserve-time
dired-copy-preserve-time is a customizable variable defined in
dired.el.gz.
Value
t
Documentation
If non-nil, Dired preserves the last-modified time in a file copy.
(This works on only some systems.)
Probably introduced at or before Emacs version 19.1.
Source Code
;; Defined in /usr/src/emacs/lisp/dired.el.gz
(defcustom dired-copy-preserve-time t
"If non-nil, Dired preserves the last-modified time in a file copy.
\(This works on only some systems.)"
:type 'boolean
:group 'dired)