From mboxrd@z Thu Jan  1 00:00:00 1970
From: Derek Feichtinger <dfeich@gmail.com>
Subject: Re: Problem with org-timestamp-up and timezones
Date: Fri, 15 Apr 2016 11:56:48 +0000 (UTC)
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To: emacs-orgmode@gnu.org

Hi

> 
> I ran into the same problem right now. Also with org mode from MELPA and the
> current emacs master from git.
> - GNU Emacs 25.1.50.5 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8) of
>   2016-04-15
> - Org-mode version 8.3.4 (8.3.4-34-gacfd41-elpaplus
> 
> Debugger entered--Lisp error: (error "Invalid time zone specification" (nil
> nil nil))
>   encode-time(0 0 12 15 4 2016 (nil nil nil))
>   org-timestamp-change(1 nil updown)
>   org-timestamp-up(1)
>   funcall-interactively(org-timestamp-up 1)
>   call-interactively(org-timestamp-up)
>   org-shiftup(nil)
>   funcall-interactively(org-shiftup nil)
>   call-interactively(org-shiftup nil nil)
>   command-execute(org-shiftup)
> 
> Cheers,
> Derek
> 
> 

Sorry, should have confirmed that before sending the last mail: I get the
same behavior using the older org version from my backup (Org-mode version
8.3.4 / 8.3.4-15-gdd9be3-elpaplus). So this must be an incompatibility
introduced in the emacs core development.

Cheers,
Derek