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+;;; sx-time.el --- time for stack-mode
+
+;; Copyright (C) 2014  Sean Allred
+
+;; Author: Sean Allred <sallred@calamity.tcs.com>
+;; Keywords: help
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'time-date)
+
+(defvar sx-time-seconds-to-string
+  ;; (LIMIT NAME VALUE)
+  ;; We use an entry if the number of seconds in question is less than
+  ;; LIMIT, but more than the previous entry's LIMIT.
+  '((100      "s"  1)
+    (6000     "m"  60.0)
+    (108000   "h"  3600.0)
+    (34560000 "d"  86400.0)
+    (nil      "y"  31557600.0))
+  "Auxiliary variable used by `sx-time-since'.")
+
+(defun sx-time-since (time)
+  "Convert the time interval since TIME (in seconds) to a short string."
+  (let ((delay (- (time-to-seconds) time)))
+    (concat
+     (if (> 0 delay) "-" "")
+     (if (= 0 delay) "0s"
+       (setq delay (abs delay))
+       (let ((sts sx-time-seconds-to-string) here)
+         (while (and (car (setq here (pop sts)))
+                     (<= (car here) delay)))
+         (concat (format "%.0f" (/ delay (car (cddr here))))
+                 (cadr here)))))))
+
+(provide 'sx-time)
+;;; sx-time.el ends here