fix(VDateInput): transform model in / out for VConfirmEdit (#20281)

fixes #20146

Co-authored-by: John Leider <[email protected]>

Author: SonTT19

packages/vuetify/src/labs/VDateInput/VDateInput.tsx

@@ -62,7 +62,14 @@ export const VDateInput = genericComponent<VDateInputSlots>()({
     const { t } = useLocale()
     const adapter = useDate()
     const { isFocused, focus, blur } = useFocus(props)
-    const model = useProxiedModel(props, 'modelValue', props.multiple ? [] : null)
+    const model = useProxiedModel(
+      props,
+      'modelValue',
+      props.multiple ? [] : null,
+      val => Array.isArray(val) ? val.map(item => adapter.toJsDate(item)) : val ? adapter.toJsDate(val) : val,
+      val => Array.isArray(val) ? val.map(item => adapter.date(item)) : val ? adapter.date(val) : val
+    )
+
     const menu = shallowRef(false)
     const vDateInputRef = ref()
 
@@ -100,7 +107,7 @@ export const VDateInput = genericComponent<VDateInputSlots>()({
 
       const target = e.target as HTMLInputElement
 
-      model.value = adapter.date(target.value)
+      model.value = target.value
     }
 
     function onClick (e: MouseEvent) {