Values for dateFormat in the REST API for creating a USER ob

I logged into the REST API and then used the sessionId to create2 a new USER object with the minimum req'd fields. It succeeded, but when I look at the created object, dateFormat was not set. I used the values from the view-source on the normal form for creating a User, but maybe that wasn't correct? http://apps.mydomain.com/rest/api/create2?sessionId=rest-5897978349608108072&objName=USER&firstName=John&lastName=Smith&email=jsmith@mydomain.com&loginName=jsmith&role=Administrator&language=en&dateFormat=7&timeZone=America%2FLos_Angeles&emailEncoding=UTF-8 Another odd thing -- the response says "19 fields have been processed" - why is that? (And can I choose to get back JSON instead of XML?)