From mboxrd@z Thu Jan  1 00:00:00 1970
From: Edward Guyatt <edwardguyatt@gmx.co.uk>
Subject: Shifting only past timestamps
Date: Fri, 24 Jul 2015 20:33:00 +0100
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Hello,

I like to be reminded to check my post on Mondays and Thursdays, every week. 
When I've done it on Monday, I mark it 'DONE' so that I can stop org-mode 
reminding me until Thursday. Here's how I used to achieve this:

*** URGENT [#A] Check post                                      :important:
DEADLINE: <2015-07-27 Mon +1w -0d>
DEADLINE: <2015-07-30 Thu +1w -0d>

In org-mode 8.2.10, if I mark 'Check post' as 'DONE', both timestamps will be 
moved forward one week. This is no good, as I need to be reminded to check my 
post on Thursday.

I think I got the desired behaviour in the last version of org-mode I used, 
which I think was this 7.8.11 from this package: 
https://packages.debian.org/wheezy/org-mode

How can I make org-mode shift only the timestamps from the past?

Thanks in advance,

Ed