diff --git a/frontend/src/lib/utils/helpers.js b/frontend/src/lib/utils/helpers.js
index f70781c..68cd1c2 100644
--- a/frontend/src/lib/utils/helpers.js
+++ b/frontend/src/lib/utils/helpers.js
@@ -88,6 +88,31 @@ export function fromRFC3339(dateString) {
 	return date.toISOString().split('T')[0];
 }
 
+/**
+ *
+ * @param {App.Types['car']} car - The car object to format
+ */
+export function carDatesFromRFC3339(car) {
+	car.end_date = fromRFC3339(car.end_date);
+	car.start_date = fromRFC3339(car.start_date);
+	car.insurances?.forEach((insurance) => {
+		insurance.start_date = fromRFC3339(insurance.start_date);
+		insurance.end_date = fromRFC3339(insurance.end_date);
+	});
+}
+
+/**
+ *
+ * @param {App.Types['car']} car - The car object to format
+ */
+export function carDatesToRFC3339(car) {
+	car.end_date = toRFC3339(car.end_date);
+	car.start_date = toRFC3339(car.start_date);
+	car.insurances?.forEach((insurance) => {
+		insurance.start_date = toRFC3339(insurance.start_date);
+		insurance.end_date = toRFC3339(insurance.end_date);
+	});
+}
 /**
  *
  * @param {App.Locals['user']} user - The user object to format