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. (a) As used in this section:
(1) "New law" means either of the following, as the case may be:
(A) The act that enacted this code.
(B) The act that makes a change in this code, whether effectuated
by amendment, addition, or repeal of any provision of this code.
(2) "Old law" means the applicable law in effect before the
operative date of the new law.
(3) "Operative date" means the operative date of the new law.
(b) This section governs the application of a new law except to
the extent otherwise expressly provided in the new law.
(c) Subject to the limitations provided in this section, a new law
applies on the operative date to all matters governed by the new
law, regardless of whether an event occurred or circumstance existed
before, on, or after the operative date, including, but not limited
to, creation of a fiduciary relationship, death of a person,
commencement of a proceeding, making of an order, or taking of an
action.
(d) If a petition, account, report, inventory, appraisal, or other
document or paper is filed before the operative date, the contents,
execution, and notice thereof are governed by the old law and not by
the new law; but any subsequent proceedings taken after the operative
date concerning the petition, account, report, inventory, appraisal,
or other document or paper, including an objection or response, a
hearing, an order, or other matter relating thereto is governed by
the new law and not by the old law.
(e) If an order is made before the operative date, including an
order appointing a personal representative, guardian, conservator,
trustee, probate referee, or any other fiduciary or officer, or any
action on an order is taken before the operative date, the validity
of the order or action is governed by the old law and not by the new
law. Nothing in this subdivision precludes proceedings after the
operative date to modify an order made, or alter a course of action
commenced, before the operative date to the extent proceedings for
modification of an order or alteration of a course of action of that
type are otherwise provided by statute.
(f) No personal representative, guardian, conservator, trustee,
probate referee, or any other fiduciary, officer, or person is liable
for any action taken before the operative date that was proper at
the time the action was taken, even though the action would be
improper if taken on or after the operative date, and such a person
has no duty, as a result of the enactment of the new law, to take any
step to alter the course of action or its consequences.
(g) If the new law does not apply to a matter that occurred before
the operative date, the old law continues to govern the matter
notwithstanding its amendment or repeal by the new law.
(h) If a party shows, and the court determines, that application
of a particular provision of the new law or of the old law in the
manner required by this section or by the new law would substantially
interfere with the effective conduct of the proceedings or the
rights of the parties or other interested persons in connection with
an event that occurred or circumstance that existed before the
operative date, the court may, notwithstanding this section or the
new law, apply either the new law or the old law to the extent
reasonably necessary to mitigate the substantial interference.