Converting Milliseconds To Minutes And Seconds With Javascript

Answer :

function millisToMinutesAndSeconds(millis) {
  var minutes = Math.floor(millis / 60000);
  var seconds = ((millis % 60000) / 1000).toFixed(0);
  return minutes + ":" + (seconds < 10 ? '0' : '') + seconds;
}

millisToMinutesAndSeconds(298999); // "4:59"
millisToMinutesAndSeconds(60999);  // "1:01"

As User HelpingHand pointed in the comments the return statement should be

return (seconds == 60 ? (minutes+1) + ":00" : minutes + ":" + (seconds < 10 ? "0" : "") + seconds);

With hours, 0-padding minutes and seconds:

var ms = 298999;
var d = new Date(1000*Math.round(ms/1000)); // round to nearest second
function pad(i) { return ('0'+i).slice(-2); }
var str = d.getUTCHours() + ':' + pad(d.getUTCMinutes()) + ':' + pad(d.getUTCSeconds());
console.log(str); // 0:04:59

Here's my contribution if looking for

h:mm:ss

instead like I was:

function msConversion(millis) {
  let sec = Math.floor(millis / 1000);
  let hrs = Math.floor(sec / 3600);
  sec -= hrs * 3600;
  let min = Math.floor(sec / 60);
  sec -= min * 60;

  sec = '' + sec;
  sec = ('00' + sec).substring(sec.length);

  if (hrs > 0) {
    min = '' + min;
    min = ('00' + min).substring(min.length);
    return hrs + ":" + min + ":" + sec;
  }
  else {
    return min + ":" + sec;
  }
}