How do I create a stopwatch

I need a simple stopwatch on screen. (Just the numbers)
It needs to start at 00:00 and count up. 00:00:01, 00:00:02, 00:00:03...
..00:00:59, 00:01:00, 00:01:01, 00:01:02 etc. accurately counting seconds, minutes, hours on and on until I tell it to stop.
I have experimented with CurrentTime(), MilliSecs(), and CreatTimer() but have been unable to figure out how to make any of those work correctly.
Did a search in the forum for stopwatch, clock, timer and none of these resulted in anything close to what is needed.

This is probably real beginners stuff - but hey, I'm a beginner.

Thank you very much for any help given.
Emmett

Here is the simple version:

Local starttime = MilliSecs()
While True
	seconds = (MilliSecs()-starttime)/1000
	Print seconds / 3600 + ":" + (seconds / 60) Mod 60 + ":" + (seconds) Mod 60
EndWhile

Including the milliseconds:

Local starttime = MilliSecs()
While True
	milseconds=MilliSecs()-starttime
	seconds = milseconds/1000
	Print seconds / 3600 + ":" + (seconds / 60) Mod 60 + ":" + (seconds) Mod 60+":"+milseconds Mod 1000
EndWhile

Thanks Again - Works Great.
Here is a working snippet of how it's plugged into a program - less any other code of course.

Graphics 1024, 768
Global starttime=MilliSecs()
  Repeat
    seconds = (MilliSecs()-starttime)/1000
    DrawText seconds / 3600 + ":" + (seconds / 60) Mod 60 + ":" + (seconds) Mod 60, 800,175
    Flip
    Cls
  Until KeyHit (KEY_ESCAPE)
End