From: Richard M. Stallman <rms@gnu.org>
Date: Sun, 7 Sep 1997 04:30:52 +0000 (+0000)
Subject: (time-stamp-time-zone): Allow nil as alternative.
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(time-stamp-time-zone): Allow nil as alternative.
---

diff --git a/lisp/time-stamp.el b/lisp/time-stamp.el
index d8a279e0082..93c4f86af1d 100644
--- a/lisp/time-stamp.el
+++ b/lisp/time-stamp.el
@@ -113,7 +113,7 @@ If nil, no notification is given."
 (defcustom time-stamp-time-zone nil
   "If non-nil, a string naming the timezone to be used by \\[time-stamp].
 Format is the same as that used by the environment variable TZ on your system."
-  :type 'string
+  :type '(choice (const nil) string)
   :group 'time-stamp)