diff --git a/src/admin/components/forms/field-types/DateTime/index.tsx b/src/admin/components/forms/field-types/DateTime/index.tsx
index 3166b1b491..57f5dd23d0 100644
--- a/src/admin/components/forms/field-types/DateTime/index.tsx
+++ b/src/admin/components/forms/field-types/DateTime/index.tsx
@@ -88,7 +88,9 @@ const DateTime: React.FC<Props> = (props) => {
           {...date}
           placeholder={getTranslation(placeholder, i18n)}
           readOnly={readOnly}
-          onChange={readOnly ? undefined : setValue}
+          onChange={(incomingDate) => {
+            if (!readOnly) setValue(incomingDate.toISOString());
+          }}
           value={value as Date}
         />
       </div>
diff --git a/test/fields/collections/Date/index.ts b/test/fields/collections/Date/index.ts
index fc69a6fda4..578a94e54d 100644
--- a/test/fields/collections/Date/index.ts
+++ b/test/fields/collections/Date/index.ts
@@ -5,7 +5,7 @@ export const defaultText = 'default-text';
 const DateFields: CollectionConfig = {
   slug: 'date-fields',
   admin: {
-    useAsTitle: 'date',
+    useAsTitle: 'default',
   },
   fields: [
     {