JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick="myFunction();">Try it</button>

<p id="demo"></p>

<script>

  function myFunction() {
    var currentdate = new Date(); 
var currentdate = new Date(); 
var datetime = currentdate.getDate() + "/"
                + (currentdate.getMonth()+1)  + "/" 
                + currentdate.getFullYear() + " "
                + currentdate.getHours() + ":"  
                + currentdate.getMinutes() + ":" 
                + currentdate.getSeconds();
    document.getElementById("demo").innerHTML = datetime;
}

</script>