Problem with the date configuration somehow

Currently my time is:

$ date
Sa 22. Apr 11:57:07 CEST 2023

My frontmatter says:

layout: post
published: true
date: 2023-04-22 10:48:00

And my _config.yml contains:

timezone:         "Europe/Berlin"

yet I get:

ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [x86_64-linux-musl]
Configuration file: /srv/jekyll/_config.yml
            Source: /srv/jekyll
       Destination: /srv/jekyll/_site
 Incremental build: disabled. Enable with --incremental
          Skipping: _posts/2023/ has a future date

What could be the reason for that ?

Is including the full datetime important? I’d remove the time and just keep 2023-04-22. Could be that it doesn’t check the locale.