(a) No such ordinance or amendments or supplements may become effective or be altered until after a public hearing at which interested parties and citizens may be heard.

(b) Notice of the time and place of the hearing shall be published in a newspaper of general circulation in the municipality at least 15 days before the holding of the hearing. (Added 1967, No. 295 (Adj. Sess.), § 5, eff. March 20, 1968.)