Re: File modification date

[Carsten Dominik <carsten.dominik@gmail.com>]

On Aug 20, 2009, at 10:12 AM, Sébastien Vauban wrote:

> Hi,
>
> I've always found the DATE header to be kind of useless, as it only  
> indicates
> the creation date of the file.
>
> For me, it would be better if it would be the last edit date as it  
> is the case
> with the Emacs time-stamp.
>
> Here a proposition to make this automagic:
>
> --8<---------------cut here---------------start------------->8---
> (add-hook 'org-mode-hook
>          (lambda ()
>            (set (make-local-variable 'time-stamp-format) "%:y-%02m- 
> %02d")
>            (set (make-local-variable 'time-stamp-start) "^#\\+DATE:  
> +")
>            (set (make-local-variable 'time-stamp-end) "$")))
> --8<---------------cut here---------------end--------------->8---
>
> Of course, `time-stamp-format' may be changed according to your taste.
>
> Shouldn't be such a thing be the default?


DATE was implemented exactly to specify a fixed date.  You can get
the modification date with

     {{{modification-time(%Y-%m-%d)}}}

and the current date with

     {{{date(%Y-%m-%d)}}}

These will be expanded upon export.  So you can, in fact, do

     #+DATE: {{{modification-time(%Y-%m-%d)}}}

HTH

- Carsten