Do a Timer by Javascript

Here is the code:

var endDate = new Date(“2019–06–20T24:00:00.00”);
timer = setInterval(function() { //timer call func every 1000ms( 1s)
 
   timeBetweenDates(endDate);
 }, 1000);
function timeBetweenDates(endDate) { //calculate how many time left
 var nowDate = new Date();
var difference = endDate — nowDate;
if (difference <= 0) {
// Timer done
 clearInterval(timer);
} else {
var left;
var days = Math.floor(difference / (1000 *60 *60 *24));
 left = difference % (1000 *60 *60 *24);
 var hours = Math.floor( left / (1000 *60 *60));
 left = left % (1000 *60 *60);
 var minutes = Math.floor( left / (1000 *60 ));
 left = left % (1000 *60);
 var seconds = Math.floor( left / 1000 );
console.log(days+”days “+ hours+ “:” + minutes +”:” + seconds);
 }
}// end of timeBetweenDates

1. Timer will call the function to check the interval between now time & end time and print as the format time.

2. var difference is millisecond between now time & end time.

3. add string “0” if hours or minutes or seconds < 10