diff --git a/src/Bundle/ChillPersonBundle/Resources/public/vuejs/HouseholdMembersEditor/store/index.js b/src/Bundle/ChillPersonBundle/Resources/public/vuejs/HouseholdMembersEditor/store/index.js
index 75b3c215f..f3801576d 100644
--- a/src/Bundle/ChillPersonBundle/Resources/public/vuejs/HouseholdMembersEditor/store/index.js
+++ b/src/Bundle/ChillPersonBundle/Resources/public/vuejs/HouseholdMembersEditor/store/index.js
@@ -302,7 +302,7 @@ const store = createStore({
           },
           number_of_children: state.numberOfChildren,
           start_date: {
-            datetime: datetimeToISO(state.startDate),
+            datetime: datetimeToISO(ISOToDate(state.startDate)),
           },
         };
       }