Re: Time computation errors

From: "Francesco Pizzolante" <fpz-djc/iPCCuDYQheJpep6IedvLeJWuRmrY@public.gmane.org>
To: mailing-list-org-mode <emacs-orgmode-mXXj517/zsQ@public.gmane.org>
Subject: Re: Time computation errors
Date: Tue, 07 Apr 2009 16:12:23 +0200	[thread overview]
Message-ID: <u7i1w4koo.fsf@missioncriticalit.com> (raw)
In-Reply-To: <87skkktx4n.fsf-EZCVE/ZCkfKiJtKbxSCZYZ53EReGIhmS@public.gmane.org> (Bernt Hansen's message of "Tue, 07 Apr 2009 09:24:24 -0400")

Hi Bernt,

Thanks for your answer.

>> Consider the following example:
>>
>> --8<---------------cut here---------------start------------->8---
>> * Test
>> #+COLUMNS: %25ITEM(Description)  %Time1{:} %Time2{:} %Time3{:}
>>
>> #+BEGIN: columnview :hlines 1 :id local
>> | Description | Time1 | Time2 | Time3  |
>> |-------------+-------+-------+--------|
>> | * Test      |  3:30 |  3:00 | #ERROR |
>> | *** Item 1  | -1:30 |  1:00 | #ERROR |
>> | *** Item 2  |  4:00 |  2:00 | #ERROR |
>> #+TBLFM: $4=$2+$3
>> #+END:
>>
>> *** Item 1
>>     :PROPERTIES:
>>     :Time1:    -1:30
>>     :Time2:    1:00
>>     :END:
>>
>> *** Item 2
>>     :PROPERTIES:
>>     :Time1:    4:00
>>     :Time2:    2:00
>>     :END:
>> --8<---------------cut here---------------end--------------->8---
>>
>>
>> Problems:
>>
>> 1) The sum of Time1 for Test headline is wrong: 3:30 instead of
>>    2:30;
>>
>> 2) I'm unable to sum times through a formula (see Time3 column).
>>    The same formula works perfectly when you replace times with
>>    integers.
>>
>> Any feedback is welcome.
>
> I don't believe negative times are supported currently.

You are probably right. The fact is that:

1) when you clock in and out, you can get negative durations (I
   know, it seems weird...) and then your clock table is wrong
   (negative duration are not taken into account when
   calculating the sums). Anyway, I think it should be good to
   support negative durations in order, for example, to compute
   differences between durations (which can lead to positive or
   negative times);

2) I'm still unable to sum positive times value in my table (see
   my problem 2) in my previous email). Is there a specific
   operator in order to sum times?

Thanks,
F.

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