Get the installation time for the last successful update to a server.

Get-LastUpdated.ps1

foreach ($Server in $servers) {
  $key = “SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\Results\Install”
  $keytype = [Microsoft.Win32.RegistryHive]::LocalMachine
  $RemoteBase = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey($keytype,$Server)
  $regKey = $RemoteBase.OpenSubKey($key)
  $KeyValue = $regkey.GetValue(”LastSuccessTime”)
  $System = (Get-Date -Format "yyyy-MM-dd hh:mm:ss")
  
  if ($KeyValue -lt $System) { 
    Write-Host " " 
    Write-Host $Server "Last time updates were installed was: " $KeyValue 
  } 
}