Powershell: Retrieving LogonDate in Active Directory - powershell

Question

I've a list of computers, I'm checking if they are connected, if they aren't check with AD and "spit out" the one that aren't connecting for more than 3 months.
If it's connected then check if a services is installed.
Here's my code:
Import-Module ActiveDirectory
$datecutoff = (Get-Date).AddDays(-90)
Get-Content "C:\powershell\pc.txt" |
foreach {
if (-not (Test-Connection -comp $_ -quiet)){
Write-host "$_ is down" -ForegroundColor Red
$LastLog = Get-ADComputer -Identity $_ | Select LastLogonDate
if($LastLog -lt $datecutoff){
Write-host "$_ is offline for more than 3 months" -ForegroundColor Yellow
}
} Else {
$service = get-service -name masvc -ComputerName $_ -ErrorAction SilentlyContinue
if ($service ){
write-host "$_ Installed"
} else {
Write-host "$_ Not Installed"
}
}
}
When it finds a disconnected computer it gives me the following error:
Cannot compare "#{LastLogonDate=}" to "2020.04.16 18:49:19" because the objects are not the same type or the object "#{LastLogonDate=}" does not implement "IComparable".
At line:10 char:20
+ if($LastLog -lt $datecutoff){
+ ~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], ExtendedTypeSystemException
+ FullyQualifiedErrorId : PSObjectCompareTo
I know the error happens because my variable is saving wrong info, but I cannot find a way to only select the date in the AD.
Is there anyway to do this?
Thanks in advance.

Answer 1

You have a couple of issues. You'll need to request that LastLogonDate is returned with Get-ADComputer as its not by default. You'll need to use the dotted notation method of selecting property LastLogonDate from the $LastLog object so your compare works.
Import-Module ActiveDirectory
$datecutoff = (Get-Date).AddDays(-90)
Get-Content "C:\powershell\pc.txt" |
foreach {
if (-not (Test-Connection -comp $_ -Quiet)) {
Write-Host "$_ is down" -ForegroundColor Red
$LastLog = Get-ADComputer -Identity $_ -Properties LastLogonDate
if ($LastLog.LastLogonDate -lt $datecutoff) {
Write-Host "$_ is offline for more than 3 months" -ForegroundColor Yellow
}
} Else {
$service = Get-Service -Name masvc -ComputerName $_ -ErrorAction SilentlyContinue
if ($service ) {
Write-Host "$_ Installed"
} else {
Write-Host "$_ Not Installed"
}
}
}
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Side note. You can filter for aged computers like this Get-ADComputer -Filter 'LastLogonDate -lt $datecutoff'