Hi Lukasz,
As of now your requirement of showing days without hours can be achieved by using MajorTickTimeFormat property in the schedule control. We have modified the previous attached sample by using the MajorTickTimeFormat property and please find the sample in the below link.
If the above provided solution doesn’t satisfy your requirement, could you please provide more information with screenshot about your requirement? So that we could analyze on your requirement further and provide you the possible solution.
Regards
Vigneshkumar R