; and shall submit such determination both to employers and affected employees as soon as possible. . VI Effective date 601. Effective date (a) General Rule Except as provided for in subsection (b), this Act and the amendments made by this Act shall take effect not later than 90 days after the date of the enactment of this Act. (b) Exception for States and political subdivisions The following are exceptions to the effective date described in subsection (a): (1) A State that has a State plan approved under section 18 ( 29 U.S.C. 667 ) shall amend its State plan to conform with the requirements of this Act and the amendments made by this Act not later than 12 months after the date of the enactment of this Act. The Secretary of Labor may extend the period for a State to make such amendments to its State plan by not more than 12 months, if the State’s legislature is not in session during the 12-month period beginning with the date of the enactment of this Act. Such amendments to the State plan shall take effect not later than 90 days after the adoption of such amendments by such State. (2) This Act and the amendments made by this Act shall take effect not later than 36 months after the date of the enactment of this Act with respect to a workplace of a State, or a political subdivision of a State, that does not have a State plan approved under section 18 ( 29 U.S.C. 667 ).