I need a function for a column to change from time stamp without time zone to date: but it has to be in function form.

I have tried many many things but no luck. I am completely stuck and lost on where to even start.

I also can’t seem to figure out how to call when creating a table.

CREATE OR REPLACE FUNCTION change_data_type (recruit TEXT, recruit_date TEXT, data TEXT)
RETURNS RECRUIT AS $$
BEGIN
    RETURN DATE(recruit_date) FROM recruit;
END;
$$ LANGUAGE PLPGSQL;