Thanks @PitaJ, ok now nodebb is running by systemd and restart from admin panel is working.
the following : https://community.nodebb.org/topic/14306/default-installation-and-looking-the-log-file

A close feature or resolved can be cool

@PitaJ @baris good morning,
Because of misconfigured systemd file and exactly the PIDFile path.
My bad.
However, I am impressed by your response time. It's amazing.
Thanks again.
About timezone there is a way to change the default ?
Look, my server is located in Netherland but the server timezone is Paris. it's more comfortable for me.