TimerDiff() returns only 50% of elapsed time

[snoopie]

Greetings,

All of the sudden my TimerDiff() or _Timer_Diff() functions return only roughly half of the elapsed time:

#include <Date.au3>

ConsoleWrite(_NowTime() & @TAB & "Begin..." & @CRLF)

$TestTimer = TimerInit()
$StartDate = _NowCalc()

Sleep(4000)

$sElapsed = _DateDiff('s', $StartDate, _NowCalc())

ConsoleWrite(_NowTime() & @TAB & TimerDiff($TestTimer) & @TAB & $sElapsed & @CRLF)

Console output:

Quote

06:38:28    Begin...
06:38:32    1941.9144144926    4

It was all working fine on this machine the past few weeks (i7 6700K, Win7 x64).

Does anyone have an idea how this can be possible?

Thanks!

 

Update: Restarting Windows solved the issue but I still would love to know how this can happen.

Console output after Windows restart:

Quote

06:50:02    Begin...
06:50:06    3994.88592655121    4

 

Edited November 19, 2016 by snoopie
Update

[mikell]

Maybe... if the machine slowed down... _DateDiff could take more time to return
I'd do it like this

#include <Date.au3>

ConsoleWrite(_NowTime() & @TAB & "Begin..." & @CRLF)

$TestTimer = TimerInit()
$StartDate = _NowCalc()

Sleep(4000)

$sElapsed2 = _DateDiff('s', $StartDate, _NowCalc())
$sElapsed1 = TimerDiff($TestTimer)

ConsoleWrite(_NowTime() & @TAB & $sElapsed1 & @TAB & $sElapsed2 & @CRLF)