On Thursday, 16 Feb 2017 at 11:18, Uwe Brauer wrote:
> Thanks very much for pointing this out to me.  This is precisely my
> situation. I see what I can do, maybe I turn customization off.

I ended up turning customisation of timestamp presentation off as it was
just too annoying for just this reason.  Pity but understandable as the
customisations allowed are too general to provide a consistent interface
for adjustments, I would guess.

-- 
: Eric S Fraga (0xFFFCF67D), Emacs 26.0.50.1, Org release_9.0.4-242-g2c27b8