JSFiddle - React, Tailwind, and code Playground

by Gabriele Petrioli

JavaScript

var birth = new Date('07/11/2003');
var check = new Date();

var milliDay = 1000 * 60 * 60 * 24; // a day in milliseconds;


var ageInDays = (check - birth) / milliDay;

var ageInYears =  Math.floor(ageInDays / 365 );
var age =  ageInDays / 365 ;

alert( 'Whole years : ' + ageInYears + '\nDetailed : ' + age  );