Howdy,
I hope you understand, we can not assist with learning specifications (like RFC 822) or generic PHP stuff like arguments for a Date object. Rather, Tribe employs me to answer questions regarding Tribe APIs.
That said I hate turning people away without helping at least little. You would want your output date to match the RFC 822 Specification. You might check with Google for how PHP Date syntax works.
Please do let me know if you have any questions regarding our API, functions, or so forth though. I would be glad to assist with that!
– Brook