JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/themes/smoothness/jquery-ui.min.css">
<div id="datepicker"></div>
<input type="text" name="something" value="thevalue" />

JavaScript

$(function(){
    
    $('#datepicker').datepicker({
    onSelect: function(dateText, inst) {
      $("input[name='something']").val(dateText);
    }
});

});