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From: Thierry Volpiatto <thierry.volpiatto@gmail.com>
To: Timothy Hobbs <tim.thelion@gmail.com>
Cc: EMACS list <help-gnu-emacs@gnu.org>
Subject: Re: Date manangement.
Date: Tue, 25 Mar 2008 12:18:35 +0100	[thread overview]
Message-ID: <87k5jr127o.fsf@thievol.homelinux.org> (raw)
In-Reply-To: <m3lk473jc5.fsf@xo-10-E6-7E.localdomain> (Timothy Hobbs's message of "Mon, 24 Mar 2008 14:25:46 -0700")

Timothy Hobbs <tim.thelion@gmail.com> writes:

> Hello.  This is Timothy.
>
> Is there a good way to add on day to a date of any sort?  time-date.el doesn't
> seem to be good at this.  What I need to do is add a day, incramenting months,
> and years, correctly, so 2008/03/31+1 = 2008/04/00 not 2008/03/32...
>
> I am currently working on a bit of elisp for planner which imports ical files.
> So I need to be able to import events that span multiple days, as mutliple tasks.
> This requires walking through the days creating a task for each one covered.
>
> Timothy
>
>
>

Hello, may be we meet us on planner mailing-list, i sent you there 
some code doing what you want, there is a function incrementing date, 
you can easily modify it for your need. here is the function:

,----
| (defun tv-time-date-in-n-days (days)
|   "Return the date in string form in n +/-days"
|   (let* ((days-in-sec (* 3600 (* (+ days) 24)))
| 	 (interval-days-sec (if `(< ,days 0)
| 				(+ (float-time (current-time)) days-in-sec)
| 			      (- (float-time (current-time)) days-in-sec)))
| 	 (sec-to-time (seconds-to-time interval-days-sec))
| 	 (time-dec (decode-time sec-to-time))
| 	 (new-date ""))
|     (setq new-date (concat
| 		    (int-to-string (nth 5 time-dec))
| 		    "."
| 		    (substring (int-to-string (/ (float (nth 4 time-dec)) 100)) 2)
| 		    "."
| 		    (substring (int-to-string (/ (float (nth 3 time-dec)) 100)) 2)))
|     new-date))
`----

,----
| ELISP> (tv-time-date-in-n-days -12)
| "2008.03.13"
| ELISP> (tv-time-date-in-n-days 32)
| "2008.04.26"
`----


-- 
A + Thierry
Pub key: http://pgp.mit.edu




  reply	other threads:[~2008-03-25 11:18 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-24 21:25 Date manangement Timothy Hobbs
2008-03-25 11:18 ` Thierry Volpiatto [this message]
2008-03-25 12:20 ` Dmitri Minaev
     [not found] <mailman.9395.1206412275.18990.help-gnu-emacs@gnu.org>
2008-03-25 13:00 ` Giles Chamberlin

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