ConvertTime.js

module.exports = {
    convertTime: function(duration) {
    var milliseconds = parseInt((duration % 1000) / 100),
        seconds = parseInt((duration / 1000) % 60),
        minutes = parseInt((duration / (1000 * 60)) % 60),
        hours = parseInt((duration / (1000 * 60 * 60)) % 24);
  
        hours = (hours < 10) ? "0" + hours : hours;
        minutes = (minutes < 10) ? "0" + minutes : minutes;
        seconds = (seconds < 10) ? "0" + seconds : seconds;
  
        if (duration < 3600000) {
            return minutes + ":" + seconds;
        } else {
            return hours + ":" + minutes + ":" + seconds;
        }
    },
    convertNumber: function(number, decPlaces) {
        decPlaces = Math.pow(10, decPlaces);
        var abbrev = ["K", "M", "B", "T"];
        for (var i = abbrev.length - 1; i >= 0; i--) {
            var size = Math.pow(10, (i + 1) * 3);

            if (size <= number) {
                number = Math.round(number * decPlaces / size) / decPlaces;
            if ((number == 1000) && (i < abbrev.length - 1)) {
                number = 1;
                i++;
            }

            number += abbrev[i];
            break;
        }
    }
  
      return number;
    },
    chunk: function(arr, size) {
        const temp = [];
        for (let i = 0; i < arr.length; i += size) {
            temp.push(arr.slice(i, i + size));
        }
        return temp;
    },

    convertHmsToMs: function(hms) {
    if (hms.length < 3) {
            return hms = ((+a[0]) * 1000)
        } else if (hms.length < 6) {
            const a = hms.split(':')
            return hms = (((+a[0]) * 60 + (+a[1])) * 1000)
        } else {
            const a = hms.split(':')
            return hms = (((+a[0]) * 60 * 60 + (+a[1]) * 60 + (+a[2])) * 1000)
        }
    },

    convertSeconds: function(seconds) {
        var hours = Math.floor(seconds / 3600);
            seconds %= 3600;
        var minutes = Math.floor(seconds / 60);
            seconds = Math.floor(seconds % 60);
            
        return (hours ? hours + ":" + (minutes < 10 ? "0" : "") : "") + minutes + ":" + (seconds < 10 ? "0" : "") + seconds;
    }
}