JSFiddle - React, Tailwind, and code Playground

by Hilarius Doren

HTML

<form name="form">
    Birthday Date (mm/dd/yyyy)
<input type="text" id="birthDate"><br>

    Current Date (mm/dd/yyyy)
    <input type="text" id="currentDate">

    <a id="Submit_Button" onclick="test();" href="javascript:void(0);" title="Submit">Submit</a>

JavaScript

var btn = document.getElementById("Submit_Button");
btn.onclick = function test() {
var vbirthdate = new Date(document.getElementById("birthDate").value);
    var vcurrentdate = new Date(document.getElementById("currentDate").value);
    var ageDate     = Math.floor((vbirthdate-vcurrentdate)/(1000*60*60*24));

    if(ageDate < 1) {
        (ageDate =  ageDate * -1)
    }
    
    alert(ageDate);

}