JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://code.jquery.com/ui/jquery-ui-git.css">
<script src="http://code.jquery.com/ui/jquery-ui-git.js"></script>
<input type="text" id="datepicker">

JavaScript

$( "#datepicker" ).datepicker(
    {
        numberOfMonths: 2,
        changeMonth: false,
        changeYear: true,
        stepMonths: 1,
        firstDay: 1,
        beforeShow: function(input, inst) {            
            inst.drawMonth = 1;   //change first draw month
            alert(inst.drawMonth); //changed but no effect
        }
    }
);