N.J. Stat. Ann. § 40:74-4

No ordinance, except when otherwise required by the general laws of the State or the provisions of chapters 70 to 76 of this Title (R.S. 40:70-1 et seq.), and except an ordinance for the immediate preservation of the public peace, health or safety which contains a statement of its urgency and is passed by a two-thirds vote of the board of commissioners, shall take effect before 20 days from the time of its final passage.