To create the Hijri (Arabic) date picker follow these steps:

Add the following JavaScript in your page’s JavaScript > File URLs field:

https://jqueryui.com/resources/demos/datepicker/i18n/datepicker-ar.js

Create a page item as a Text Field and specify a name, for example, P4_DATEPICKER.

Add the following jQuery code in the page’s Function and Global Variable declare section:

$( function() {
  $( "#P4_DATEPICKER" ).datepicker( $.datepicker.regional[ "ar" ] );
} );

You can notice the P4_DATEPICKER item in the above code. Replace it with your page item.

Now save the changes and run the page, you will get the output as follows:

When the user clicks or navigates on the item, it will display the calendar.

If you need this date picker on almost every page, then include the JavaScript URL at the application level.