What should I do about the departure date field in the new TDAC application as a long-term resident on a retirement visa?

In the TDAC application for long-term residents on a retirement visa, the departure date field is not mandatory. It can be left blank, as indicated by comments from other users. It's also suggested that in the absence of a red asterisk, there's no need to fill it out unless specifically required by the updated application. Some users recommend entering the date of the annual visa renewal instead.