Variable: dired-sort-by-date-regexp
dired-sort-by-date-regexp is a variable defined in dired.el.gz.
Value
"\\(\\`\\| \\)-[^- ]*t[^ SXU]*\\(\\(\\`\\| +\\)\\(--[^ ]+\\|-[^- tSXU]+\\)\\)* *$"
Documentation
Regexp recognized by Dired to set by date mode.
Source Code
;; Defined in /usr/src/emacs/lisp/dired.el.gz
(defvar dired-sort-by-date-regexp
(concat "\\(\\`\\| \\)-[^- ]*t"
;; `dired-ls-sorting-switches' after -t overrides -t.
"[^ " dired-ls-sorting-switches "]*"
"\\(\\(\\`\\| +\\)\\(--[^ ]+\\|-[^- t"
dired-ls-sorting-switches "]+\\)\\)* *$")
"Regexp recognized by Dired to set `by date' mode.")