setInterval timer problems

programming flash
1

I’m trying to make a timer that when started, begins a movie and tracks its progression in seconds, minutes, and hours. I’ve been using SetInterval to count tenths of a second for accuracy. My problem is the timer doesn’t seem to be keeping time correctly. I let it run for 30 seconds against my windows clock and always comes like 5-6 seconds short. Anyone know whats up with this? Would getTimer() be more accurate??


   playInterval = setInterval(timer, 100);
   function timer () {
   	tenths++;
   	if (tenths>= 10) {
   		tenths= 0;
   		seconds++;
   	}
   	if (seconds >= 60) {
   		seconds = 0
   		minutes++;
   	}
   	if (minutes >= 60) {
   		minutes = 0;
   		hours++;
   	}	
   	// 	Format the digits properly
   	if (seconds <= 9) {
   		sec = "0" + seconds;
   	} else {
   		sec = seconds;
   	}
   	if (minutes <= 9) {
   		min = "0" + minutes;
   	} else {
   		min = minutes;
   	}
   	if (hours <= 9) {
   		hrs = "0" + hours;
   	} else {
   		hrs = hours;
   	}
   	timeToShow = hrs +":" + min + ":" + sec;
   	_root.timestamps_mc.video_mc.timer_txt.text = timeToShow;
   	updateAfterEvent();
   }
2

I use get timer for all of my flashing. In all the tuts i have read it uses this method.

Hope that helped,