On Wed, Feb 7, 2018 at 12:22 PM Berry, Charles <ccberry@ucsd.edu> wrote:

> Use an `eval' macro.
>
> In a more recent version than you use, this works:
>
> * abc
>   :PROPERTIES:
>   :EXPORT_TITLE: {{{etitle(my title)}}}
>   :END:
>
> #+macro: etitle (eval (concat (format-time-string "%Y-%m-%d") " " $1))
>

That works for EXPORT_TITLE!

So I tried for EXPORT_FILE_NAME, but it doesn't work there, because
org-export-output-file-name should be getting called internally *before*
the macro expansion is done.
-- 

Kaushal Modi