Was searching the forum and the help-files in vain... until I stumbled across the expression "since EPOCH" in the _DateDiff() example ... vice versa conversion shouldn't be a problem. #include <Date.au3> ; Ref http://de.wikipedia.org/wiki/Unixzeit#Besondere_Werte ; Now $iDateCalc = _DateDiff( 's',"1970/01/01 00:00:00",_NowCalc()) MsgBox( 4096, "", "Number of seconds since EPOCH: " & $iDateCalc ) ; Ref from Wikipedia #1 => 1000000000 $iDateCalc = _DateDiff( 's',"1970/01/01 00:00