I'm not sure how to save an Adobe Interactive Form, I can give you a
print form version of the form, but that will not let you use the date
field. The issue resides with any date field on any form that is being
used by a user who has Adobe Acrobat Reader DC v. 15.023.20053
installed. All you have to do, to replicate this issue is to simply
enter or choose 01/01/2017, when the focus of that date box is changed,
eg., if you move to the next field, click out side of the date box,
etc., the date is ...