Problem with form controls when converting to pdf (FDF) submit format.

I created a document with Librewriter that contains a number of date and time fields. After I export as pdf (with Create PDF form Submit format: FDF), these controls appear as plain text boxes when the file is opened with any pdf viewer (at least the ones I know). Is there something I can do to fix the issue?

I have the same issue. Does anyone have a workaround to fix this?