N.J. Stat. Ann. § 54:4-2.53

This act shall apply to real and personal property taxes due and payable in the year 1968 and thereafter and shall not affect the obligation, lien or duty to pay any taxes, interest or penalties which have accrued or may accrue by virtue of any assessment made or which may be made with respect to taxes levied for any year prior to the year 1968, nor shall this act affect the legal authority to assess and collect taxes which may be or have been due and payable prior to January 1, 1968, together with such interest and penalties as would have accrued thereon under any provision of law amended or repealed hereby; nor shall this act invalidate any assessments or affect any proceeding for the enforcement thereof pending upon the effective date of this act or upon January 1, 1968, or during the period between said dates.