Vertical Typing Interactive Text Box

Hi there, 

I am creating Interactive PDFs from Indesign. Actually I am working on a planner and I want to have an Interactive text field (text box) that allows the customers to type the date vertically. But Indesign Button and Forms panel doesn't have an option for that. How should I do it? Please advise. I just need my buyers to type on the PDF vertically in the date field. Please help !!!