Here is code to do it, but I think you'll find that if this is the SAME GHOST IMAGE that the dates will be the same. I think maybe you're looking at different images.

Jens has a UDF that does this and more called OSID


 
Break On
Dim $InstallDate
$InstallDate = cTime(ReadValue('HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion','InstallDate'))
'OS Install Date: ' + $InstallDate ?
 
 
Function cTime($iSeconds,optional $iOffset)
  Dim $iEpoch, $iDays, $iZ, $iH, $iA, $iB, $iC
  Dim $iYear, $iMonth, $iDay, $iHour, $iMinutes
 
  $iEpoch=719163
 
  ; Adjust time for local 
  $iSeconds=Val($iSeconds)+(Val($iOffset*3600))
  $iDays=$iSeconds/86400
  $iSeconds=$iSeconds-($iDays*86400)
 
  $iDays=$iDays+$iEpoch
 
  $iZ=$iDays + 306
  $iH=100*$iZ-25
  $iA=$iH/3652425
  $iB=$iA-$iA/4
  $iYear=(100*$iB+$iH)/36525
  $iC=$iB+$iZ-365*$iYear-$iYear/4
  $iMonth=(5*$iC+456)/153
  $iDay=$iC-(153*$iMonth-457)/5
 
  if $iMonth > 12
    $iYear=$iYear + 1
    $iMonth = $iMonth - 12
  endif
 
  $iHour=$iSeconds / 3600
  $iMinutes=($iSeconds-$iHour*3600)/60
  $iSeconds=$iSeconds-$iHour*3600-$iMinutes*60
  $cTime=''+$iYear+'/'+right('00'+$iMonth,2)+'/'+right('00'+$iDay,2)
  $cTime=$cTime+' '+right('00'+$iHour,2)+':'+right('00'+$iMinutes,2)+':'+right('00'+$iSeconds,2)
EndFunction