From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Barton <lists@manor-farm.org>
Subject: Re: Date calculations
Date: Wed, 30 Dec 2009 13:09:40 +0000
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References: <6DC4A9FE-BA1F-4106-87D7-29985BF09116@jumans.net>
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To: Fredrik <fredrik@jumans.net>
Cc: emacs-orgmode@gnu.org

Fredrik wrote:
> I'm using a normal org-file as my contact register so I easier can link 
> tasks to a specific person. I have also added events as birthdays to 
> each contact but is there some way I can make them show up in the agenda 
> with some yearly calculations?
> 
> For example a simple birthday reminder can look like this:
> 
> * <2006-12-30 ++1y> Happy Birthday!
> 
> Is there some clever way I can add a date calculation to it when it 
> shows up in the agenda?
> 
> * <2006-12-30 ++1y> Happy Birthday %d years!
> 
> Regards,
> 
You can use diary sexps. Search the manual for "Diary-style sexp 
entries". As an example I have:

%%(diary-anniversary 3  1 2000) Ella is %d years old

in one of my org files.

Ian.