M-x customize-group RET org-publish RETDavid Frascone <dave@frascone.com> writes:
> I use org mode to keep track of my daily projects . . what I'm working on,
> etc. I tag work related items, and, when I export to html, only work items
> are exported.
>
> What I'd like to do, however, is only export things that have changed, or
> have been dated in the last week.
>
> Similarly, I'd like to archive off old completed tasks.
>
> Could someone point me to how to do these things . . . I'm sure it's
> documented somewhere :)
See the last two entries on that page.
Set the "Org Publish Timestamp Directory" and "Org Publish use
Timestamps Flag" to `on'.
From now on, Org-mode will publish only files, that changed since the
last time you published.