Re: Midnight and noon in agendas

From: Carsten Dominik <dominik@science.uva.nl>
To: "Daniel J. Sinder" <djsinder@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: Midnight and noon in agendas
Date: Fri, 2 Jun 2006 07:15:15 +0200	[thread overview]
Message-ID: <8f7cc6986079c0cfee6c91b925f0a175@science.uva.nl> (raw)
In-Reply-To: <447F79F8.2060708@gmail.com>

Well, if this is the way things are normally interpreted,
then this is clearly a bug.  Thanks for explaining this to me.
Strange system.  Switching am to pm always makes the event happen 
later, except when the hour is 12.

However, I will not make items jump days because of a time 
specification.  This has first of all technical reasons:  Agenda 
entries are collected based on the date only. The time-of-day 
specification is only used later in the process to sort the entries on 
the day.  So given this restriction, what would you or other people 
here want:

Should 12am be listed as 0:00 or as 24:00?
Should 12:21am be listed as 0:21 or as 24:21?

It seems to me that the logic would be a bit better to schedule these 
show uo as 0:00 and 0:21.  If you wanted to put something at midnight 
at the end of the day you would then have to use 24:00 and 24:21.

Opinions?

- Carsten

On Jun 2, 2006, at 1:36, Daniel J. Sinder wrote:

> I've noticed that '12pm' when used as a time-of-day specification
> puts an entry at 24:00 in the agenda.  '12am' places the item at
> noon in the agenda.
>
> It is arguable whether 00:00 should be used instead of 24:00.
> Personally, I prefer it the way it is, where midnight events are
> placed at 24:00 because if I have something scheduled/due at
> midnight, I'd like to see it on the agenda for the day *preceding*
> the event/item.
>
> However, the issue I differ on is the interpretation of 12am as noon
> and 12pm as midnight.  Although they are both ambiguous, it seems
> that 12am is more typically associated with midnight, while 12pm is
> associated with noon.  One explanation goes like this:  Since the
> 24-hour clock runs from 00:00:00--23:59:59, then 00:00:00-11:59:59
> is AM and 12:00:00-23:59:59 is PM.
>
> Just curious....is the current mapping a deliberate choice or a bug?
>
> Dan
>
>
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--
Carsten Dominik
Sterrenkundig Instituut "Anton Pannekoek"
Universiteit van Amsterdam
Kruislaan 403
NL-1098SJ Amsterdam
phone: +31 20 525 7477