bug#23299: 25.1.50; org-timestamp-change: Invalid time zone specification: (nil nil nil)

[Eli Zaretskii]

> From: Peter Münster <pmlists@free.fr>
> Date: Sat, 16 Apr 2016 11:08:30 +0200
> 
> With latest git-emacs, I get this error, after org-timestamp-up-day on a
> time-stamp:
> 
> org-timestamp-change: Invalid time zone specification: (nil nil nil)
> 
> How could I make org-timestamp-up-day work again please?

Please show a complete recipe for reproducing this problem, starting
with "emacs -Q".  (I tried something simple and probably stupid, but
couldn't reproduce this.)

Thanks.