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 -->

CSS

.someDates a{
    color: red !important;
}

JavaScript

$(function() {
    var someDates = ['10/8/2010', '10/28/2010', '10/30/2010'];
    
    $("#datepicker").datepicker({
        beforeShowDay: function(date) {
            for (var i = 0; i < someDates.length; i++) {
                if (new Date(someDates[i]).toString() == date.toString()) {
                    return [true,'someDates'];
                } else if( date > new Date('10/10/2010') ) {
                    return [true,'','greater than 10/10/2010'];
                    // try hovering dates greater than 10/10/2010...
                }
            }
            return [true];
        }
    });
});