YASTHHMMSSF (Yet Another Seconds To HHMMSS Function)

seconds_to_hhmmss.js

var seconds_to_hhmmss = function(seconds) {
    if (seconds < 0 || isNaN(seconds)) {
        return "--:--";
    }

    var hh = (seconds / 3600);
        hh = Math.floor(hh);
        hh = hh < 10 ? "0" + hh : hh;
    var mm = (seconds / 60) % 60;
        mm = Math.floor(mm);
        mm = mm < 10 ? "0" + mm : mm;
    var ss = seconds % 60;
        ss = Math.floor(ss);
        ss = ss < 10 ? "0" + ss : ss;

    if (hh >= 1) {
        return hh + ":" + mm + ":" + ss;
    } else if (mm >= 1) {
        return mm + ":" + ss;
    } else {
        return "00:" + ss;
    }
};