The change of matrimonial property regime takes effect between the parties from the date of the decision or deed providing for it and, with regard to third parties, three months after the publicity formalities provided for in Article
1397-5have been completed.
However, if these formalities have not been carried out, the change of matrimonial property regime may be relied on as against third parties if, in the acts concluded with them, the spouses have declared that they have changed their matrimonial property regime.

