By default, the DatePicker value is
null and the Calendar popup is hidden.
The DatePicker provides options for:
To set the initial value that is rendered by the DatePicker, set the
defaultValue property. This approach allows the component to display a value upon its initial render while remaining in an uncontrolled state.
To display the calendar popup when the DatePicker initially renders, set the
defaultShow property to
true. This approach allows the component to show an open calendar popup while remaining in an uncontrolled state.