Re: Date manangement.

[Thierry Volpiatto]

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