“This Act [enacting this section and sections 260a, 266, and 267 of this title and amending sections 261 to 263 of this title] shall take effect on April 1, 1967; except that if any State, the District of Columbia, the Commonwealth of Puerto Rico, or any possession of the United States, or any political subdivision thereof, observes daylight saving time in the year 1966, such time shall advance the standard time otherwise applicable in such place by one hour and shall commence at 2 o’clock antemeridian on the last Sunday in April of the year 1966 and shall end at 2 o’clock antemeridian on the last Sunday in October of the year 1966.”

“That this Act [enacting this section and sections 260a, 266, and 267 of this title and amending sections 261 to 263 of this title] may be cited as the ‘Uniform Time Act of 1966’.”