JSFiddle - React, Tailwind, and code Playground

HTML

<div id="datepicker"></div>

JavaScript

$("#datepicker").datepicker({
    inline: true,
   firstDay: 1,
         showOtherMonths: true,
         dayNamesMin: ['S', 'M', 'T', 'W', 'T', 'F', 'S'],
   onSelect: function(dateText, inst) {
      var dateAsString = dateText; //the first parameter of this function
      var dateAsObject = $(this).datepicker( 'getDate' ); //the getDate method
     alert(dateAsString);  
   }
    
});