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Re: [Orgmode] thoughts: "formulas for timestamps" feature

From: Carsten Dominik
Subject: Re: [Orgmode] thoughts: "formulas for timestamps" feature
Date: Wed, 6 Jun 2007 10:10:56 +0200

On Jun 1, 2007, at 16:20, Ruslan Kosolapov wrote:

Hi all, it's me again :)

My previous message
contains complains about ability to use formulas for timestamp (third

Yesterday I found http://www.cs.brown.edu/~gmarceau/spread.el

I think it is what I need.  But one small problem blocks me.

In org-file I wrote:
** NEW Task1
   DEADLINE: qwe <= (concat "<2007-05-15 Втр>") => task1

After M-x spread-recalc org file goes to:
** NEW Task1
   DEADLINE: "<2007-05-15 Втр>" <= (concat "<2007-05-15 Втр>") => task1

But agenda do not determine dates in quotes (btw, shift-up works

I see two solutions:
 - fix regexp of dates determination for quotes support (in org-mode)

I would recommend against this.  I am not sure what this would break,
but it may very well break something.

 - fix spread-mode - remove quotes printing

I tried to fix spread-mode, and fail (there are many reasons of it).

1. Does org-mode uses symbols "<=" and "=>"?

Yes, => is used in CLOCK lines, and in tables (but there only as
a display property).

2. Does org-mode contains functions for timestamp calculation?  I need
something like
(add-to-timestamp "<2007-05-15 Втр>" "+1d") with result "<2007-05-16 Срд>"

Org itself uses time-date.el.  There are no functions which would make
this easy - but it could be easy to write one - base it
on org-timestamp-change, but make it read and return strings.

- Carsten

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