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/)]

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/)]

[Göktuğ Kayaalp]

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/)

Re: 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/)]

[Kyle Meyer]

Göktuğ Kayaalp <self@gkayaalp.com> writes:

> 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 think this is because org-timestamp-format works with timestamp
objects, as returned by org-element-context, rather than strings.

-- 
Kyle

Re: 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/)]

[Kyle Meyer]

Hi Yaniv,

[You forgot to include the list.  Adding now.]

Yaniv Gilad <yanivdll@gmail.com> writes:

> I’m seeing the same issue:
>
>  (let ((properties (org-export-get-environment)))
>         (princ (json-encode 
>                 (list 
>                  :date (org-timestamp-format (car (plist-get properties :date)) "%Y-%m-%d")
>                  :author (substring-no-properties (car (plist-get properties :author)))
>                  :category (cdr (assoc "CATEGORY" org-file-properties))
>                  :post (org-export-as backend nil nil t)
>                  :title (substring-no-properties (car (plist-get properties :title))))))))))

org-timestamp-format takes an element, not a string.  See the two posts
below.

http://article.gmane.org/gmane.emacs.orgmode/102033
http://article.gmane.org/gmane.emacs.orgmode/102018

-- 
Kyle