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Finding the Last Logon Time of a Client

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So it is a beautiful evening here in Phoenix and I’m sitting behind my computer working.  It’s all good.  Especially when I get to do a little PowerShell and I get to help someone on the side.  So I’m on PowerShell.com and I see that someone needs a little help getting the last logon time for their clients from Active Directory.  He is doing everything right with pulling the correct information from AD.  His goal is to be able to look for all computer objects that have not logged in in the past 60 days. 
This is actually a good example of how to start the creation of a PowerShell tool.  I am going to expand this tool to make it more flexible and to allow the user to ask for a variety of days as opposed to one.  Also, we will output the information in a reusable format.
This command essentially filters the output of Get-ADComputer as long as you include the –Properties LastLogonDate parameter when using Get-ADComputer. The output is unaltered from Get-ADComputer so you can then pipe it to what ever other command that you need.
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Function Get-StaleClients
{
[CmdletBinding()]
Param (

    [parameter(Mandatory=$true,
                ValueFromPipeline=$true)]
    [Microsoft.ActiveDirectory.Management.ADComputer[]]
    $Computer,

    [parameter(Mandatory=$true)]
    [INT]
    $Days

)

BEGIN
{
    # Create a .NET object with the cutoff
    # date in the past
    $DaysPast = (Get-Date -hour 0 -Minute 0).AddDays(-$Days)
} # END: BEGIN Block

PROCESS
{
    Foreach ($C in $Computer)
    {
        # Verify that the object has a LastLogonDate property.
        If ($C.LastLogonDate -ne [System.DateTime])
        {
            Write-Warning "LastLogonDate property not in the object."
        }
        Else
        {
            $C |
            Where-Object {$_.LastLogonDate -le $DaysPast}
        }
    } # END: Foreach ($C in $ComputerName)
} # END: PROCESS BLOCK

END {} # END: END Block

<#
.SYNOPSIS
Filters all Active Directory computer objects that are past to it and determines
if those clients have logged in within a specific number of days.

.DESCRIPTION
Filters all Active Directory computer objects that are past to it and determines
if those clients have logged in within a specific number of days.

.PARAMETER Computer
The Computer object from Active Directory to examine.

.PARAMETER Days
The number of days since the last logon.

.INPUTS
Microsoft.ActiveDirectory.Management.ADComputer

.EXAMPLE
Get-ADComputer -Filter * -Properties LastLogonDate | Get-StaleClients -Days 15

Filters all computer objects that have not logged in in the past 15 days.

.NOTES
===============================================================================
== Cmdlet: Get-StaleClients                                                  ==
== Author: Jason A. Yoder                                                    ==
== Company: MCTExpert of Arizona                                             ==
== Date: 2015APR06                                                           ==
== Copyright: All rights reserved.                                           ==
== Version: 1.0.0.0                                                          ==
== Legal: The user assumes all responsibility and liability for the usage of ==
== this PowerShell code.  MCTExpert of Arizona, Its officers, shareholders,  ==
== owners, and their relatives are not liable for any damages.  As with all  ==
== code, review it and understand it prior to usage.  It is recommended that ==
== this code be fully tested and validated in a test environment prior to    ==
== usage in a production environment.                                        ==
==                                                                           ==
== Does this code make changes: NO                                           ==
===============================================================================
#>

} # END: Function Get-StaleClients

#Get-ADComputer -Filter * -Properties LastLogonDate|
#    Get-StaleClients -Days 15

#Get-ADComputer -Filter * |
#    Get-StaleClients -Days 15

Get-Help Get-StaleClients -Full



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