From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bastien <bzg@altern.org>
Subject: Re: Modify clock in/out time to previous/following full quarter of
 an hour.
Date: Tue, 18 Sep 2012 09:55:11 +0200
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References: <k2sb7d$bdg$1@ger.gmane.org>
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In-Reply-To: <k2sb7d$bdg$1@ger.gmane.org> (Rainer Stengele's message of "Thu,
	13 Sep 2012 12:06:38 +0200")
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To: Rainer Stengele <rainer.stengele@online.de>
Cc: emacs-orgmode@gnu.org

Hi Rainer,

Rainer Stengele <rainer.stengele@online.de> writes:

> How could I achieve this? Which hook should I use? How? (I never
> programmed something like this).

(defun my-org-adjust-clock-timestamps ()
  (interactive)
  (let ((org-time-stamp-rounding-minutes '(0 15)))
    (save-excursion
      (beginning-of-line)
      (re-search-forward org-ts-regexp3 nil t)
      (backward-char 2)
      (org-shiftdown)
      (re-search-forward org-ts-regexp3 nil t)
      (backward-char 2)
      (org-shiftup))))

HTH,

-- 
 Bastien