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);