4 Nov 91 became "9111 4", and 01 Nov 91 became "911101".
Which meant that 4 Nov 91 sorted before 01 Nov 91.
;;; -*-Scheme-*-
;;;
-;;; $Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/rmailsrt.scm,v 1.4 1991/09/10 21:33:30 bal Exp $
+;;; $Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/rmailsrt.scm,v 1.5 1991/11/04 19:40:43 bal Exp $
;;;
;;; Copyright (c) 1991 Massachusetts Institute of Technology
;;;
(substring date
(re-match-start-index 1)
(re-match-end-index 1))))
- (string-pad-left day 2))
+ (string-pad-left day 2 #\0))
;; Time
(substring date (re-match-start-index 4) (re-match-end-index 4)))
;; Cannot understand DATE string.