if(seconds < 3600){

  new Date(seconds * 1000).toISOString().substring(14, 19) //00:00

}else{

    new Date(videoDuration * 1000).toISOString().substring(11, 19) // 00:00:00

}

​

//or just one line conditional 

seconds < 3600

            ? new Date(seconds * 1000).toISOString().substring(14, 19)

            : new Date(seconds * 1000).toISOString().substring(11, 19);

let totalSeconds = 28565;

let hours = Math.floor(totalSeconds / 3600);

totalSeconds %= 3600;

let minutes = Math.floor(totalSeconds / 60);

let seconds = totalSeconds % 60;

​

console.log("hours: " + hours);

console.log("minutes: " + minutes);

console.log("seconds: " + seconds);

​

// If you want strings with leading zeroes:

minutes = String(minutes).padStart(2, "0");

hours = String(hours).padStart(2, "0");

seconds = String(seconds).padStart(2, "0");

console.log(hours + ":" + minutes + ":" + seconds);

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