Dynamic Date filter

I want to allow the user to enter a date which will be used to filter a view of a table and a csv download.
If a use a form for the date entry, how to I get that date into a filter for the read action?
Please be very detailed in your answer.
Thanks.

The CSV button should submit the filtering form to the CSV action. Toolbar button should have that - list view name will actually be the name of the form containing your filters.

If a use a form for the date entry, how to I get that date into a filter.

If your column is a date or datetime you can use it as log as the field's actual format is yyyy-mm-dd or whatever the default is