You can't hardcode the time in the DatePicker - it shows the time of the Date object you set its Value property to. So you need to set the time of your date property.
If in this case, may I know how to add the date + 1?
for an example, User choose date : 07/13/2021, after submit the form and the system will add 1 more day for the date and insert into DB as 07/14/2021.