The "FAR AIM", as you call it, is actually a commercial reproduction of a combination of two seperate govt. pubs.
The FAR reproduction part is a copy of the CFR 14 Federal Aviation Regulations that were in effect at the time of the commercial publication of the "FAR AIM" you speak of. The actual government publication of the Federal Register and the regulations therein do not have "expiration dates". If you subscribe to the FAR's, you get updates as they occur. Having the commercial copy of the "FAR AIM" does not mean that these regulations are current.
The Aeronautical Information Manual was last published on Feb. 19, 2004, with change 1 being on Aug. 5, 2004, and the next scheduled change on Feb. 17, 2005.