How to get default date format?

FROM : Daniel Morrow
DATE : Thu Oct 07 15:17:49 2004

Dear cocoa-dev list,

I have a date string that get in this form "2004-10-07"

which I'd like to turn into a date, and then return the string

"Thursday, October 10, 2004"

However, I don't want to hard-code the format of the string. I want to
ask the system what the user's preferred long-date format is, and
display it like that. You know, the format that the user chooses in the
"International" system prefs.

Thanks,
-Dan.