Lastlogon from All Domain Controllers CSV output

I came across the following script that almost meets my requirement. It queries all the domain controllers and gets the recent logged in time and date. What i am trying to do is run it against AD i.e. using "-Searchbase" parameter get i want to be able to get the results in a csv format containing samaaccountnme, Searchbase location and lastlogon time.

It is essentail for the auditing purposes.

Import-Module ActiveDirectory

function Get-ADUserLastLogon([string]$userName)
{
  $dcs = Get-ADDomainController -Filter {Name -like "*"}
  $time = 0
  foreach($dc in $dcs)
  { 
    $hostname = $dc.HostName
    $user = Get-ADUser $userName | Get-ADObject -Server $hostname -Properties lastLogon 
    if($user.LastLogon -gt $time) 
    {
      $time = $user.LastLogon
    }
  }
  $dt = [DateTime]::FromFileTime($time)
  Write-Host $username "last logged on at:" $dt }

Get-ADUserLastLogon -UserName testuser

I even tried changing the following line that i thought would fixes it but no luck.

$user = Get-ADUser -Filter * -Properties * -Searchbase "OU=Staff,DC=Home,DC=ac,DC=uk" | Get-ADObject -Server $hostname -Properties lastLogon 

Get-AduserLastLogon $Username

Can someone please help please.

Solution

Here is an example of how to get most recent lastLogon attribute for users on all DCs:

# Get a list of every domain controller's name
$dcNames = Get-ADDomainController -Filter * |
  Select-Object -ExpandProperty Name |
  Sort-Object

# Get a collection of users in specified OU
$searchBase = "OU=Sales,DC=fabrikam,DC=com"
$users = Get-ADUser -Filter * -SearchBase $searchBase

# Hashtable used for splatting for Get-ADUser in loop
$params = @{
  "Properties" = "lastLogon"
}

foreach ( $user in $users ) {
  # Set LDAPFilter to find specific user
  $params.LDAPFilter = "(sAMAccountName=$($user.SamAccountName))"
  # Clear variables
  $latestLogonFT = $latestLogonServer = $latestLogon = $null
  # Iterate every DC name
  foreach ( $dcName in $dcNames ) {
    # Query specific DC
    $params.Server = $dcName
    # Get lastLogon attribute (a file time)
    $lastLogonFT = Get-ADUser @params |
      Select-Object -ExpandProperty lastLogon
    # Remember most recent file time and DC name
    if ( $lastLogonFT -and ($lastLogonFT -gt $latestLogonFT) ) {
      $latestLogonFT = $lastLogonFT
      $latestLogonServer = $dcName
    }
  }
  if ( $latestLogonFT -and ($latestLogonFT -gt 0) ) {
    # If user ever logged on, get DateTime from file time
    $latestLogon = [DateTime]::FromFileTime($latestLogonFT)
  }
  else {
    # User never logged on
    $latestLogon = $latestLogonServer = $null
  }
  # Output user
  $user | Select-Object `
    SamAccountName,
    @{Name = "LatestLogon";       Expression = {$latestLogon}},
    @{Name = "LatestLogonServer"; Expression = {$latestLogonServer}}
}