toHHMMSS.js

toHHMMSS(sec) {
        let sec_num = parseInt(sec, 10); // don't forget the second parm
        let hours  = Math.floor(sec_num / 3600);
        let minutes = Math.floor((sec_num - (hours * 3600)) / 60);
        let seconds = sec_num - (hours * 3600) - (minutes * 60);

        let Ohours = hours + '';
        let Ominutes = minutes + '';
        let Oseconds = seconds + '';
        if (hours < 10) {
            Ohours = "0" + hours;
        }
        if (minutes < 10) {
            Ominutes = "0" + minutes;
        }
        if (seconds < 10) {
            Oseconds = "0" + seconds;
        }
        var time = Ohours + ':' + Ominutes + ':' + Oseconds;
        return time;
    }