I want to set initialData to my form the params the i get but my dateParam is string and i can't set it to defaultValues. Any ideas how to convert it to date? Thanks

  const timeSlot = searchParams.get('timeSlot');
  const barberParam = searchParams.get('barber');
  const dateParam = searchParams.get('day');
  


  const form = useForm<z.infer<typeof AppointmentsSchema>>({
    resolver: zodResolver(AppointmentsSchema),
    defaultValues: appointments
      ? {
          ...appointments,
        }
      : {
          clientName: "",
          clientPhone: "",
          clientEmail: "",
          serviceId: "",
          barberId: "",
          day:  dateParam || undefined,
          time: "",
        },
  });