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Nowadays, PDF forms are widely available to fill and save. The easiest method is to transform the PDF into an image and then convert it back to PDF. Doing so will render all the interactive elements (checkboxes, checklists, buttons) into one flat PDF
A:There is no definition of a “date field” in the PDF specifications. What you need to do is create a standard interactive text field with a date format. The date picker will be shown when a user is trying to enter a date in the text field
The good news is the flagship open source office suite LibreOffice can open and edit PDF documents. Don't expect to create interactive forms and the like in LibreOffice, but you can take a basic PDF document and make simple edits, thanks to LibreOffice's built-in Draw feature. In Draw, your PDF documents temporarily become images that can be edited