How to convert DATE pulled from csv using "pulldata", to be used as validations for new date inputs

Good Afternoon @aditya @Kal_Lam @stephanealoo @Tumaini @edwinaikins if you know of any solution to this situation? I have been trying for several days to get the calculations in various ways and I have not succeeded in KoboCollect. Can you help me? Thank you in advance for your continued cooperation

Here I have also exposed the situation Questions asked