An accurate stopwatch

i've been having problems creating accurate stopwatch. tried using 2 different timers still having problems milliseconds. , i'm having problem resetting stopwatch too. wanted return 0 when reset stopped. need help. here's code:

 

var mytimer:timer = new timer(1000);
var mymillitimer:timer = new timer(1);
mymillitimer.addeventlistener(timerevent.timer, domillitimer);
mytimer.addeventlistener(timerevent.timer, dotimer);
var mytimenum = 0 ;
var mymillinum = 0;

 

function domillitimer (e){
    mymillinum++;
    mymillinum = math.floor(mymillinum%10)
    mymillisectxt.text = mymillinum;
}

 

function dotimer (e:timerevent):void{
    mytimenum++;
    var mysec = math.floor(mytimenum%60);
    var mymin = math.floor(mytimenum/60%60);
    var myhour = math.floor(mytimenum/3600);
    if (mysec<10){
        mysectxt.text = "0"+mysec;
    }else {
        mysectxt.text = mysec;
    }
    if (mymin<10){
        mymintxt.text = "0"+mymin;
    }else {
        mymintxt.text = mymin;
    }
    if (myhour<10) {
        myhourtxt.text = "0"+myhour;
    } else {
        myhourtxt.text = myhour;
    }
}
btnstart.addeventlistener(mouseevent.click, dostart);
function dostart (e) {
    mytimer.start();
    mymillitimer.start();
}
btnstop.addeventlistener(mouseevent.click, dostop);
function dostop (e) {
    mytimer.stop();
}
btnreset.addeventlistener(mouseevent.click, doreset);
function doreset (e) {
    mytimer.reset();
    mymillitimer.reset();
   
   
}

only gettimer() returns accurate time.

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