提供给“calendar”的“string”类型的“selected”属性无效,需要“date”的实例吗?

我在react js中使用日期选择器 https://www.npmjs.com/package/react-datepicker 但我现在的价值是空的 null 。现在我想在集中精力 input field 。但我收到错误/警告为什么?

proxyConsole.js:72 Warning: Failed prop type: Invalid prop `selected` of type `String` supplied to `Calendar`, expected instance of `Date`.
    in Calendar (created by OnClickOutside(Calendar))
    in OnClickOutside(Calendar) (created by DatePicker)
    in div (created by InnerPopper)
    in InnerPopper (created by Context.Consumer)
    in Popper (created by PopperComponent)
    in Manager (created by PopperComponent)
    in PopperComponent (created by DatePicker)
    in DatePicker (created by Main)

实际上,我在转换数据时添加了一个条件

 data[i].displaytext = i;
        if (data[i].dataType === "DATE" && data[i].value) {
          data[i].value = new Date(data[i].value);
        }
        obj[lastLabel] = [...obj[lastLabel], data[i]];
      }

这是我的密码 https://codesandbox.io/s/rmx02zzr5o

请帮助我删除此警告