JSFiddle - React, Tailwind, and code Playground

by marianico2

HTML

<input type="date" id="date-input" required />
<button id="submit">Submit</button>

JavaScript

(function() {
    $('#submit').on('click', function(){
      var startdate = new Date($('#date-input').val());
      startdate.setFullYear(startdate.getFullYear() + 1)
      alert(startdate.toISOString().slice(0, 10));
    });
})();