Creating a date form

I am creating a letter template and need to create a date form which can be edited to show whichever date is required. Trouble is, I don’t know how to do it.

Maybe can help this and that discussion

Any date INCLUDING today’s date (the date the letter would be written)

To clarify your question: You want to edit the date to any date and not to today’s date? If my assumption is wrong please clarify.

I’ve since solved it.
Using fields, I think it’s called that!