I created something but I found a mistake on my side and (I assume) on Vikunja’s side.
Attaced you see the settings from my cloud.vikunja.
It is super clumpy to change the field from a date to a string, but anyway.
My mistake was that I didn’t use now/d+1d - I just use now/d. But it is still strange that I saw all Tasks, also from the same day, when created the FIlter in cloud.vikunja.
On try.vikunja and in cloud.vikunja it is not possible to write now/d+1d. As soon as I type the “+” the edit field converts the sting into a date.