I'm attempting to modify the formatting of timestamps when they are exported to either HTML or TeX/pdf. I have tried two different ways, neither one of which works. The first way was here and I put that code in my dotemacs file. However, I get a symbol's value is void error for org-export-filter-timestamp-functions when I open emacs.

The second way I tried, which also does not work is to attempt the example in the manual under "defining filters for individual files." I copy/pasted the text into the beginning of my org document, but this does not change the formatting of timestamps at all.

#+BIND: org-export-filter-timestamp-functions (tmp-f-timestamp)
 #+BIND: org-export-filter-strike-through-functions (tmp-f-strike-through)
 #+begin_src emacs-lisp :exports results :results none
   (defun tmp-f-timestamp (s backend info)
     (replace-regexp-in-string "&[lg]t;\\|[][]" "" s))
   (defun tmp-f-strike-through (s backend info) "")
  • I assume org-export-filter-timestamp-functions is a quite new variable of org-mode. Presumably, it is introduced in org-mode 8.3. What is your org-version? For modifying time-stamps see also stackoverflow.com/questions/23297422. /org-mode-timestamp-format-when-exported. Note that the solution using org-export-filter-timestamp-functions is from the year 2015. My org-version is 8.2.5h and I don't have org-export-filter-timestamp-functions either.
    – Tobias
    Dec 4, 2015 at 17:52
  • Note also that org-export.el was in contrib and not in the main org-mode branch according to this link: github.com/tkf/org-mode/blob/master/contrib/lisp/org-export.el , That git entry seems to be from year 2012.
    – Tobias
    Dec 4, 2015 at 17:57
  • It would be nice if someone out there could check for the variable org-export-filter-timestamp-functions in org-mode 8.3.
    – Tobias
    Dec 4, 2015 at 18:00
  • @Tobias - Thanks. I just updated to org 8.3.2 and still have this problem. I downloaded org-plus-contrib, but this doesn't seem to contain org-export.el file.
    – Alex
    Dec 4, 2015 at 20:12

1 Answer 1


The variable org-export-filter-timestamp-functions is defined in ox.el. You need to add

(require 'ox)

in front of the code where you want to use org-export-filter-timestamp-functions.

Note: My comments above were wrong. (Sorry about that.)


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