The following notice from the PTO is important for any overseas patent filer having recently allowed or issued patents stemming from § 371 applications:
The USPTO is in the process of correcting an error in the computer program that it uses to calculate the patent term adjustment that affects patents issuing from international applications entering the national stage as to the United States pursuant to 35 U.S.C. § 371. The USPTO's computer program incorrectly calculates the three-year pendency provision of 35 U.S.C. 5 154(b)(l)(B) in international applications as being measured from the date that the requirements of 35 U.S.C. 9 371 were fulfilled rather than the date the national stage commenced under 35 U.S.C.4 371(b) or (f) in the international application.
Read the full notice here (link)