JSFiddle - React, Tailwind, and code Playground

HTML

<div class="demo">
    <select id="month" name="month">
        <option value="01">January</option> 
        <option value="02">February</option>
        <option value="03">March</option>
        <option value="04">April</option>
        <option value="05">May</option>
        <option value="06">June</option>
        <option value="07">July</option>
        <option value="08">August</option>
        <option value="09">September</option>
        <option value="10">October</option>
        <option value="11">November</option>
        <option value="12">December</option>
    </select>
    <select id="day" name="day">
        <option value="01">1</option>
        <option value="02">2</option>
        <option value="03">3</option>
        <option value="04">4</option>
        <option value="05">5</option>
        <option value="06">6</option>
        <option value="07">7</option>
        <option value="08">8</option>
        <option value="09">9</option>
        <option value="10">10</option>
        <option value="11">11</option>
        <option value="12">12</option>
        <option value="13">13</option>
        <option value="14">14</option>
        <option value="15">15</option>
        <option value="16">16</option>
        <option value="17">17</option>
        <option value="18">18</option>
        <option value="19">19</option>
        <option value="20">20</option>
        <option value="21">21</option>
        <option value="22">22</option>
        <option value="23">23</option>
        <option value="24">24</option>
        <option value="25">25</option>
        <option value="26">26</option>
        <option value="27">27</option>
        <option value="28">28</option>
        <option value="29">29</option>
        <option value="30">30</option>
        <option value="31">31</option>
    </select>
    <select id="year" name="year">
        <option value="2011">2011</option>
        <option value="2012">2012</option>
        <option...

JavaScript

$("#datepicker").datepicker({
    showOn: "button",
    buttonImage: "http://jqueryui.com/demos/images/calendar.gif",
    buttonImageOnly: true,
    onSelect: function(dateText, inst) {
        //dateText comes in as MM/DD/YY
        var datePieces = dateText.split('/');
        var month = datePieces[0];
        var day = datePieces[1];
        var year = datePieces[2];
        //define select option values for
        //corresponding element
        $('select#month').val(month);
        $('select#day').val(day);
        $('select#year').val(year);

    }
});