(1) This act applies to all proceedings commenced on or after July 1, 1971. However, pending actions for divorce are deemed to have been commenced on the bases provided in s. 61.052, and evidence as to such bases for dissolution of marriage after July 1, 1971, shall be in compliance with this act.
(2) This act applies to all proceedings commenced after July 1, 1971, for the modification of a judgment or order entered prior to July 1, 1971.
(3) In any action or proceeding in which an appeal was pending or a new trial was ordered prior to July 1, 1971, the law in effect at the time of the order sustaining the appeal or the new trial governs the appeal, the new trial, and any subsequent trial or appeal.