JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.10.4/themes/cupertino/jquery-ui.css">
<div id="demo" class="dp-tt-demo">
</div>

JavaScript

$(document).ready(function() {
    var today = new Date();
    var month = today.getMonth() + 1;
    var year = today.getFullYear();
    var days = [31, 28, 31, 30, 31, 30, 31, 31,
                30, 31, 30, 31];

    $('#demo').datepicker({
        beforeShowDay: function(date) {
            var retval = [ false, "" ];
            var day = date.getDate();
            if ((day % 2) === 0) {
                retval[0] = true;
                retval[2] = 'Tooltip: ' + date.toString();
            }
            return retval;
        },
        hideIfNoPrevNext: true,
        maxDate: month + '/' + days[month - 1] + '/' + year,
        minDate: month + '/1/' + year,
        onSelect: function(date) {
            alert('Selected: ' + date);
            return true;
        }
    });

    $('div.dp-tt-demo a.ui-state-active').removeClass('ui-state-active');
    $('div.dp-tt-demo a.ui-state-highlight').removeClass('ui-state-highlight');
    $('div.dp-tt-demo a.ui-state-default').tooltip();
});