Will resolve to YES if Manifold adds an option to set it to the YYYY-MM-DD format manually, or changes the default date format to YYYY-MM-DD for the close dates on the portfolio list.

Will resolve to NO if there are no updates that allows using the YYYY-MM-DD date format on the portfolio list.

Note: This date format is already used when setting or editing the dates for the "Question closes in" field, this question is not concerning that, only the dates in the read-only UI of the portfolio list. Also this is meant to be for the browser UI not the app, in the app it shows how many hours/days since the bet instead of the closing date. But if either of them (browser site or app) add functionality for YYYY-MM-DD by the deadline in the read-only UI for Portfolio I will resolve Yes.

See also: reddit.com/r/ISO8601/