JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://jqueryui.com/themes/base/jquery.ui.all.css">
<div class="demo"> 
 
<p>Date: <input type="text" id="datepicker"></p> 
 
</div><!-- End demo -->

JavaScript

var disabledDates = [];
    $("#datepicker").datepicker({
        onSelect: function(dateText, inst) { 
            disabledDates.push(dateText);
        },
        beforeShowDay: editDays
    });


function editDays(date) {
        for (var i = 0; i < disabledDates.length; i++) {
            if (new Date(disabledDates[i]).toString() == date.toString()) {             
                 return [false];
            }
        }
        return [true];
     }