Editing spinner date widget?

I think the spinner appearance might be a device operating system thing?

You can use relevant directly on a date question, like in this example.

What is your specific use case? For example, you want to make sure the date is between the 15th and 20th of the month or some such?

You may be able to use relevant, calculations, and form operators for converting dates and time. For example use format-date(date, format) to pull out just the day of month and numeric month. And then make the user go back to the question.