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I needed this functionality for some high precision calculations I'm making. (autoit is not fast enough to support counting nanoseconds, sorry!) What's it do? It returns the number of microseconds past the current millisecond on the system clock. How accurate is it? Due to autoit limitations the counter will always be between 3-15 microseconds behind the system. ->*(This is how long autoit takes to initialize a counter) Example + UDF: _microsecinit() ;we HAVE to call this first to initialize the the counter while 1 sleep(random(25,100)) ;random sleep to show microsecond difference better ConsoleWrite(@yday&'/'&@year&' '&@HOUR&':'&@MIN&':'&@SEC&':'&@MSEC&':'&_microseconds()&@CRLF) ;call _microseconds() to get the microseconds WEnd Func _microseconds() local $ms, $ms2 if TimerDiff($microtimer) > 5000 Then $ms = @MSEC $ms2 = $ms Do $ms2 = @MSEC Until $ms2 > $ms $microtimer = TimerInit() ;attempt to re-sync microseconds EndIf $time = StringSplit(TimerDiff($microtimer), ".") $time = StringLeft($time[2], 4) return $time EndFunc func _microsecinit() local $ms, $ms2 $ms = @MSEC $ms2 = $ms Do $ms2 = @MSEC Until $ms2 > $ms global $microtimer = TimerInit() EndFunc If you have any ways of making it more precise, please submit it!