@enno — first, I’d suggest adding a comment to the workflow that you linked to. The author may see it and either answer your question, or update his workflow.
If you don’t need to see today plus one day, then you are in luck, as I have found two workflows that may help:
This one focuses on a specific date: editorial-workflows.com - Diese Website steht zum Verkauf! - Informationen zum Thema editorial workflows.
And this one shows all items that contain a specific tag: editorial-workflows.com - Diese Website steht zum Verkauf! - Informationen zum Thema editorial workflows.
Very brief video showing these in action:
