(A) The repeal of a repealing ordinance does not revive the ordinance originally repealed, nor impair the effect of any saving clause therein.
(ILCS Ch. 5, Act 70 § 3)
(B) The reenactment, amendment, or repeal of an ordinance does not do any of the following, except as provided in division (C) of this section.
(1) Affect the prior operation of the ordinance or any prior action taken thereunder.
(2) Affect any validation, cure, right, privilege, obligation, or liability previously acquired, accrued, accorded, or incurred thereunder.
(3) Affect any violation thereof or penalty, forfeiture, or punishment incurred in respect thereto, prior to the amendment or repeal.
(4) Affect any investigation, proceeding, or remedy in respect of any privilege, obligation, liability, penalty, forfeiture, or punishment. The investigation, proceeding, or remedy may be instituted, continued, or enforced, and the penalty, forfeiture, or punishment imposed, as if the ordinance had not been repealed or amended.
(ILCS Ch. 5, Act 85 § 2)
(C) If the penalty, forfeiture, or punishment for any offense is reduced by a reenactment or amendment of an ordinance, the penalty, forfeiture, or punishment, if not already imposed, shall be imposed according to the ordinance as amended.
(ILCS Ch. 5, Act 70 § 4)