(a) During the following time periods, the owner of the registration must file an affidavit or declaration of continued use or excusable nonuse, or the registration will be cancelled: (1) (i) For registrations issued under the Trademark Act of 1946, on or after the fifth anniversary and no later than the sixth anniversary after the date of registration; or (ii) For registrations issued under prior Acts, on or after the fifth anniversary and no later than the sixth anniversary after the date of publication