It would be easier to add one day occurrence if the date would need to be selected only once for one day long occurrence.
Now you need to select the start and the end day one by one from the date picker even if it’s same day, so the end day could automatically be the start day and then be selected different day if the occurance is more than one day long.
Ideal solution would be to pick multiple days from the calendar for one day occurences at once.
