Format time HH:MM

formatTime.ts

// total in seconds
function formatTime(total: number): string {
    // If the number is float ceiling gives best result
    var total = Math.ceil(total), 
        mins = Math.floor(total / 60),
        secs = Math.floor(total - mins * 60),
        m = ("000" + mins).slice(-2),
        s = ("000" + secs).slice(-2);
    
    return m + ":" + s;
}