#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#include <MsgBoxConstants.au3>
       
Local $hGUI = GUICreate("Счетчик секунд",700,300)
Local $myexit = GUICtrlCreateLabel ("", 0, 0,700,200) 
GUICtrlSetFont($myexit ,25)

GUISetState(@SW_SHOW, $hGUI)
Local $hTimer = TimerInit()

While 1
$msg = GUIGetMsg()
if  $msg = $GUI_EVENT_CLOSE then
ExitLoop
endif

Local $iDiff = TimerDiff($hTimer)

GUICtrlSetData($myexit ,Round($iDiff/1000,1))

WEnd