U.S. Constitution, Twentieth Amendment, Section 5
Sections 1 and 2 shall take effect on the 15th day of October following the ratification of this article.
Notes
Sets sections 1 and 2 of the Twentieth Amendment, on the start of federal terms and the annual meeting of Congress, to take effect on the 15th day of October following the ratification of the article, so those two sections did not apply immediately upon ratification but on that later fixed date in October.
Use as reference
Lexinter.net | U.S. Const. amend. XX, § 5 | https://laws.lexinter.net/constitution/us/amendment-20/section-5