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Get-ADComputer -Filter on LastLogonDate - why does one method work and not the other?

Darren Rose 496 Reputation points
2022-07-15T15:33:06.723+00:00

Hi

Running PowerShell to get list of users which meet criteria from AD, can someone explain to me why the first query with hard coded date works fine and returns results:- 

$ADcomputers2 = Get-ADComputer -Filter "OperatingSystem -notlike '*Server*' -and Name -notlike 'TEST*' -and LastLogonDate -gt '15 July 2021 16:22:17'" | select-object -Expand Name

But this second one using a variable for date returns no results even though value of $LastUsed is exactly the same format / value as I used in the above test? 

$LastUsed = (Get-Date).AddDays(-365)  
$ADcomputers = Get-ADComputer -Filter "OperatingSystem -notlike '*Server*' -and Name -notlike 'TEST*' -and LastLogonDate -gt '$LastUsed'" | select-object -Expand Name
Windows Server PowerShell
Windows Server PowerShell
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.PowerShell: A family of Microsoft task automation and configuration management frameworks consisting of a command-line shell and associated scripting language.
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  1. Rich Matheisen 45,906 Reputation points
    2022-07-15T19:20:36.75+00:00

    When $lastUsed is used in the way you're using it, the object's "ToString()" method will return " AM" or " PM" at the end of the returned value.

    If you change your filter to " . . . -and LastLogonDate -gt '15 July 2021 4:22:17 PM'" does it still work?