JavaScript count down, add hours & minutes

Question

So, I have the below (seconds countdown) in good order. But! I am trying to add hours & minutes as apart of the count down as well. Ideally keeping the same structure, and j

Answer 1

var totalSeconds = 3723; // lets say we have 3723 seconds on the countdown
                         // that's 1 hour, 2 minutes and 3 seconds.

var hours   = Math.floor(totalSeconds / 3600 );
var minutes = Math.floor(totalSeconds % 3600 / 60);
var seconds = totalSeconds % 60;

var result = [hours, minutes, seconds].join(':');
console.log(result);
// 1:2:3

• hours is seconds divided by the number of seconds in hour (3600) rounded down
• minutes is the remainder of the above division, divided by the number of seconds in a minute (60), rounded down.
• seconds is the remainder of total seconds divided by seconds in a minute.

Each calculation after hour has to use a modulus calculation to get the remainder, because you don't care about total time at that step, just progress to the next tick.