Prompt date - Composer

[cavagnaro]

Hi guys,
Question here, on Composer there is as you know a JS file that tells how to reproduce the guides.
The Date one says:

The format specification can
* modify which fields are spoken.  If no format specification
* parameter is given, the month and day are spoken.  Otherwise,
* the date fields specified in the format specification will be
* spoken.  Each output field is represented by a constant in the
* Format class.  Multiple output fields are specified by
* bitwise OR'ing the appropriate constants.

* @param value The date in YYYYMMDD format.
* @param format An optional format specification
* @return An array of URL strings.

How can we specify such format from Composer??? Or we have to modify the JS to a static one?