+;; By Frank Schmitt <ich@Frank-Schmitt.net>. Allows to have
+;; age-depending date representations. (e.g. just the time if it's
+;; from today, the day of the week if it's within the last 7 days and
+;; the full date if it's older)
+(defun gnus-seconds-today ()
+ "Returns the number of seconds passed today"
+ (let ((now (decode-time (current-time))))
+ (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600))))
+
+(defun gnus-seconds-month ()
+ "Returns the number of seconds passed this month"
+ (let ((now (decode-time (current-time))))
+ (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600)
+ (* (- (car (nthcdr 3 now)) 1) 3600 24))))
+
+(defun gnus-seconds-year ()
+ "Returns the number of seconds passed this year"
+ (let ((now (decode-time (current-time)))
+ (days (format-time-string "%j" (current-time))))
+ (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600)
+ (* (- (string-to-number days) 1) 3600 24))))
+
+(defvar gnus-user-date-format-alist
+ '(((gnus-seconds-today) . "%k:%M")
+ (604800 . "%a %k:%M") ;;that's one week
+ ((gnus-seconds-month) . "%a %d")
+ ((gnus-seconds-year) . "%b %d")
+ (t . "%b %m '%y")) ;;this one is used when no other does match
+ "Alist of time in seconds and format specification used to display dates not older.
+The first element must be a number or a function returning a
+number. The second element is a format-specification as described in
+the documentation for format-time-string. The list must be ordered
+smallest number up. When there is an element, which is not a number,
+the corresponding format-specification will be used, disregarding any
+following elements. You can use the functions gnus-seconds-today,
+gnus-seconds-month, gnus-seconds-year which will return the number of
+seconds which passed today/this month/this year.")
+
+(defun gnus-user-date (messy-date)
+ "Format the messy-date acording to gnus-user-date-format-alist.
+Returns \" ? \" if there's bad input or if an other error occurs.
+Input should look like this: \"Sun, 14 Oct 2001 13:34:39 +0200\"."
+ (condition-case ()
+ (let* ((messy-date (safe-date-to-time messy-date))
+ (now (current-time))
+ ;;If we don't find something suitable we'll use this one
+ (my-format "%b %m '%y")
+ (high (lsh (- (car now) (car messy-date)) 16)))
+ (if (and (> high -1) (= (logand high 65535) 0))
+ ;;overflow and bad input
+ (let* ((difference (+ high (- (car (cdr now))
+ (car (cdr messy-date)))))
+ (templist gnus-user-date-format-alist)
+ (top (eval (caar templist))))
+ (while (if (numberp top) (< top difference) (not top))
+ (progn
+ (setq templist (cdr templist))
+ (setq top (eval (caar templist)))))
+ (if (stringp (cdr (car templist)))
+ (setq my-format (cdr (car templist))))))
+ (format-time-string (eval my-format) messy-date))
+ (error " ? ")))
+;;end of Frank's code
+