Is a court order modifying support retroactive to any time period before the filing date of the modification motion?

"A court order modifying support retroactive to any time period before the filing date of a modification motion would thus violate the governing statutory scheme. Such an act, moreover, would be in excess of the court's jurisdiction. [Citation.] ' "A court acts in excess of jurisdiction 'where, though the court has jurisdiction over the subject matter and the parties in the fundamental sense, it has no "jurisdiction" (or power) to act except in a particular manner, or to give certain kinds of relief, or to act without the occurrence of certain procedural prerequisites.' " ' [Citation.]" (Stover v. Bruntz (2017) 12 Cal.App.5th 19, 26.)