On Friday, 16 Jun 2017 at 21:05, Uwe Brauer wrote:

[...]

> Then I use org-agenda and
> v c
>
> But nothing is really done. I don't see any effect of visualizing the
> conflicting date Monday 8:30-9:30
>
> What do I miss? 

The v c sequence invokes the clock checking code.  It has nothing to do
with timestamps but looks instead for gaps and overlaps in your
clocking.  If you clock those projects, you will have the information
that this special check is for.

hope this makes sense!

-- 
: Eric S Fraga via Emacs 26.0.50, Org release_9.0.6-425-gf4fca1