Hilft das?
[autoit]MsgBox(0,"",_StringToSec("01:22:22") & " Sekunden")
[/autoit][autoit][/autoit][autoit][/autoit][autoit]Func _StringToSec($sTime)
Local $iRet, $aTime = StringRegExp($sTime, "(?x)(\d+):(\d+):(\d+)",3)
For $i = 2 To 0 Step -1
$iRet += ($aTime[$i] * ($i = 2) * 1) + ($aTime[$i] * ($i = 1) * 60) + ($aTime[$i] * ($i = 0) * 3600)
Next
Return $iRet
EndFunc ;==>_StringToSec