From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <nicholas.dokos@hp.com>
Subject: Re: Wish: switch active time-stamps to inactive when CANCELED
Date: Fri, 18 Jan 2013 09:07:01 -0500
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References: <2013-01-18T11-28-57@devnull.Karl-Voit.at>
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In-Reply-To: Message from Karl Voit <devnull@Karl-Voit.at> of "Fri,
	18 Jan 2013 11:34:27 +0100." <2013-01-18T11-28-57@devnull.Karl-Voit.at>
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Karl Voit <devnull@Karl-Voit.at> wrote:

> Hi!
> 
> I tend to keep events that I do not attend in my calendar for
> archiving reasons. But I switch their status to CANCELED.
> Unfortunately, those events still appear on my Google calendar and
> so forth. I get my usual reminders and it messes up my free/busy
> list.
> 
> Therefore, I am thinking that canceled events should turn their
> active time-stamps into inactive with an Org-mode option. This way,
> I can recall them in my agenda by typing ']' (show inactive
> time-stamps) but they do not interfere with my daily workflow.
> 
> What do you think of such an option for Org-mode?
> 

You can probably accomplish this with org-after-todo-state-change-hook:

Write a function that checks if org-state is "CANCELED", and if so looks
for active timestamps and calls org-toggle-timestamp-type on them.

Then add the function to the hook.

And don't forget to post the code here as well as on Worg :-)

Nick