28 USC Appendix Rule 86 - Effective Dates
(a) In General. These rules and any amendments take effect at the time specified by the Supreme Court, subject to 28 U.S.C. 2074. They govern:
(1) proceedings in an action commenced after their effective date; and
(2) proceedings after that date in an action then pending unless:
(A) the Supreme Court specifies otherwise; or
(B) the court determines that applying them in a particular action would be infeasible or work an injustice.