Javascript Media Seconds to MM:SS:MS string

secondsToTimeString

secondsToTimeString = function (seconds) {
    
    var ms = Math.floor((seconds*1000) % 1000);
    var s = Math.floor(seconds%60);
    var m = Math.floor((seconds*1000/(1000*60))%60);
    var strFormat = "MM:SS:XX";
    
    if(s < 10) s = "0" + s;
    if(m < 10) m = "0" + m;
    if(ms < 10) ms = "0" + ms;

    strFormat = strFormat.replace(/MM/, m);
    strFormat = strFormat.replace(/SS/, s);
    strFormat = strFormat.replace(/XX/, ms.toString().slice(0,2));
    
    return strFormat;
}

I believe there is a small bug in this code. Line 10 should be if(ms < 100) ms = "0" + ms;.

Without the fix, the function would run as follows:

// outputs "00:00:50"
secondsToTimeString(0.05)

But this is incorrect, as it should output "00:00:05".