67.1. Every municipality resulting from an amalgamation that adopts a by-law to become a party to this plan may provide, if at least one of the municipalities whose territory has been amalgamated was a party to this plan at the time of the amalgamation, notwithstanding section 2, that the by-law has effect from the date on which a majority of the council members of the new municipality make the oath provided for in section 313 of the Act respecting elections and referendums in municipalities (chapter E-2.2).
The by-law referred to in the first paragraph must, to take effect in accordance with that paragraph, come into force before 31 December of the year following the year in which the new municipality is constituted.