Birthdate not available in YMD format

The uinames.com site and extended usage API return birthdates pre-formatted as DMY and MDY, and raw date (POSIX). The YMD format common in Far East Asia (Japan, China, etc.) and ISO 8601 is not returned though of course could be generated from the raw date.

I suggest returning the birthdate only as a raw POSIX date and leaving the formatting to the user, or adding YMD format as well for consistency. Or perhaps return POSIX date plus ISO 8601 date string?