JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css">
<input id="date" />

JavaScript

var highlight = 3;
$('#date').datepicker({
    beforeShowDay: function(date){
        // highlight days matching the "highlight" weekday :
        var res = [true, "", ""];
        
        if (date.getDay() == highlight) {
            res = [true, "ui-state-hover", "tip"];
        }
        
        return res;
    },
    onChangeMonthYear: function(){
        // delayed update : change the "highlight" weekday and trigger refresh
        setTimeout(function(){
            highlight += 1;
            highlight = highlight % 7;
            $('#date').datepicker('refresh');
        }, 1000);
    }
});