JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<input type="text" id="datepicker" />

JavaScript

$("#datepicker").datepicker({
    beforeShowDay: function(date) {
        var day = date.getDay();
        return [(day != 1 && day != 2), ''];
    }
});