JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.0/themes/redmond/jquery-ui.css">
<script src="http://trentrichardson.com/examples/timepicker/js/jquery-ui-timepicker-addon.js"></script>
<input type="text" class="datepicker" id="birthday"/>

CSS

/* css for timepicker */
/*
.ui-timepicker-div .ui-widget-header{ margin-bottom: 8px; }
.ui-timepicker-div dl{ text-align: left; }
.ui-timepicker-div dl dt{ height: 25px; }
.ui-timepicker-div dl dd{ margin: -25px 10px 10px 65px; }
.ui-timepicker-div td { font-size: 90%; }
*/

JavaScript

$("#birthday").datepicker({
    dateFormat: 'dd.mm.yy',
    defaultDate: '21.12.95',
    beforeShowDay: true
    
});

/*jQuery("#birthday").datepicker("option",
    "beforeShowDay", "enableAllDays"
);
*/
 
function enableAllDays() {
 
 // var day = date.getDay();
 // If day == 1 then it is MOnday
 
 
 return [true] ;
 
  
}