From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?G=C3=B6ktu=C4=9F_Kayaalp?= <self@gkayaalp.com>
Subject: Bug: `org-timestamp-format' does not return correct time [8.2.10
 (8.2.10-41-g42228a-elpa @ /home/gk/.emacs.d/packages/org-20150601/)]
Date: Wed, 21 Oct 2015 19:42:21 +0300
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Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.  You don't know how to make a good report?  See

     http://orgmode.org/manual/Feedback.html#Feedback

Your bug report will be posted to the Org-mode mailing list.
------------------------------------------------------------------------

The function `org-timestamp-format' returns bad values:

    (org-timestamp-format "<2015-10-07 Wed>" "%d %B %Y")
    "30 November -001"
    (org-timestamp-format "[2015-10-07 Wed]" "%d %B %Y")
    "30 November -001"
    (org-timestamp-format "[2015-10-07]" "%d %B %Y")
    "30 November -001"
    (org-timestamp-format "<2015-10-07>" "%d %B %Y")
    "30 November -001"
    (org-timestamp-format "2015-10-07" "%d %B %Y")
    "30 November -001"
    (org-timestamp-format (current-time) "%d %B %Y")
    "30 November -001"
    (org-timestamp-format (org-parse-time-string "[2015-10-07 Wed]")
                          "%d %B %Y")
    "30 November -001"


I tried this for my latex export filter, and got the same output for the
timestamp in the second example:

    (defun gk-ox-latex-format-inactive-timestamp (text backend info)
      (when (org-export-derived-backend-p backend 'latex)
        (org-timestamp-format text "%d %B %Y")))

I get the expected result from this piece of code:

    (format-time-string
     "%d %B %Y"
     (apply #'encode-time
            (org-parse-time-string
             text)))
    "07 November 2015"

I see two commits that affect this function, visible here:

http://orgmode.org/cgit.cgi/org-mode.git/log/?qt=grep&q=org-timestamp-format&showmsg=1

One of them adds it, the other one refactors it, without changing the logic.

Emacs  : GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
 of 2015-09-10 on foutrelis
Package: Org-mode version 8.2.10 (8.2.10-41-g42228a-elpa @ /home/gk/.emacs.d/packages/org-20150601/)