Once I have added a due date to a card by adding a comment with a MM/DD/YYYY date, is there any way I can change that?The answer to can I delete a comment? is currently not yet and editing comments is not possible either.  Will a new comment with a different date override the previously added date?
How can I change the due date for a card?
trello
All you need to do is add another comment with a due date and it will override an existing due date.