How can I set that the DST will be used?
I have set inside the Paper UI the timezone to GMT+1.
On the rasperry PI with openhabian I see the time without DST.
So now it is 15:13 and I see 14:13 inside the logs and on the CLI.
So I think also the rules are running with time 14:13 instead of 15:13.
Have you tried using sudo openhabian-config tool and select option 30 then number 33 to set system time?
Thanks this solved the problem. Now I see from timedatectl the time 18:44 and now it is 18:44.
The log file still shows one hour before 17:44!
Let’s see if the rules are working now as exptected.
Thanks again.
You may need to restart OH and if that does not work then stop OH and clean the cache. 
After reboot the log is also correct.
So I think all is fine now.
Thanks.