fix: Date Column editing issue.

docs: add some examples.

lib/ui.js

@@ -10,7 +10,7 @@ import { GridColumn, GridInputColumn, GridDropdownColumn, GridCheckboxColumn, Gr
 import { Popup, createPopup, showAlert, showConfirm } from "./ui/popup";
 import { createPicture, createAudio, createVideo, createFile } from './ui/media';
 import { validation, convertCssStyle } from './ui/extension';
-import { createDateInput, formatDate, setDateValue, getDateValue, DateSelector } from './ui/date';
+import { createDateInput, toDateValue, formatDate, setDateValue, getDateValue, DateSelector } from './ui/date';
 
 export {
   createElement,
@@ -43,6 +43,7 @@ export {
   showConfirm,
   // dateSelector
   createDateInput,
+  toDateValue,
   formatDate,
   setDateValue,
   getDateValue,