discussed Cited "see, e.g." Colville v. Allegheny County Retirement Board Moreover, we also agree with the RBAC’s interpretation of the phrase “within five years of’ the effective date of Act 85 to mean five years after December 31, 1999. 10 In support of its interpretation, the RBAC recognized that Act 85 would be given a retroactive effect if applied to Col-ville, in violation of the recognized statutory principle that whenever a statute or part of a statute is amended, the new provisions shall be construed as effective only from the date when the amendment became effective. 1 Pa.C.S. § 1953; see also, Mager v. State Employees’ Retirement Board, 849 A.2d …