Changing time every second javascript - setInterval

 function doDate()

{

    var str = "";

    var days = new Array("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday");

    var months = new Array("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");

    var now = new Date();

    str += "Today is: " + days[now.getDay()] + ", " + now.getDate() + " " + months[now.getMonth()] + " " + now.getFullYear() + " " + now.getHours() +":" + now.getMinutes() + ":" + now.getSeconds();

    document.getElementById("todaysDate").innerHTML = str;

}

setInterval(doDate, 1000);

reference:- https://stackoverflow.com/questions/26584233/updating-javascript-time-every-second