Get-Uptime is a cmdlet to gather the uptime for Windows Systems around the network. You can get a single or multiple nodes StartTime, Uptime in days, Status and if it needs to be patched.

Get-Uptime.ps1

<#
.Synopsis
   Cmdlet for checking the uptime for a Windows System.
.DESCRIPTION
   Get-Uptime is a cmdlet to gather the uptime for Windows Systems around the network.  
   You can get a single or multiple nodes StartTime, Uptime in days, Status and if it needs to be patched.
.EXAMPLE
   Get-Uptime -ComputerName IT-GSD-01

    ComputerName StartTime             Uptime(Days) Status MightNeedPatched
    ------------ ---------            ------------ ------ ----------------
    IT-GSD-01    01/04/2016 07:30:30  11           OK     False           
.EXAMPLE
   Get-Uptime -ComputerName IT-GSD-01, SMS-LOC-03, PSM-LOC-01, PDDKKSL

    ComputerName StartTime            Uptime(Days) Status  MightNeedPatched
    ------------ ---------           ------------ ------  ----------------
    IT-GSD-01    01/04/2016 07:30:30  11          OK      False           
    SMS-LOC-03   12/28/2015 06:10:49  18          OK      False           
    PSM-LOC-01   ERROR                ERROR       OK      False           
    PDDKKSL      OFFLINE                          OFFLINE                 
#>
Function Get-Uptime
{
    [CmdletBinding()]
    Param
    (
        # Param help description
        [Parameter(Mandatory=$true,
                   ValueFromPipelineByPropertyName=$true,
                   Position=0)]
        [string[]]$ComputerName
    )

    Begin
    {
        $Output = @()  
    }
    Process
    {
        Foreach($Server in $ComputerName)
        {
            If($strConnection = Test-Connection -ComputerName $Server -Count 1 -Quiet)
            {
            Try{

                    $strOS = Get-WmiObject -Class Win32_OperatingSystem -ComputerName $Server -ErrorAction SilentlyContinue
                    $strUptime = (New-TimeSpan $($strOS.ConvertToDateTime($strOS.LastBootUpTime)) $(Get-Date)).Days
                    $strLastBoot = $strOS.ConvertToDateTime($strOS.LastBootUpTime)
                    $strStatus = "OK"
                    If($strUptime -ge 30)
                    {
                        $strPatched = "$True"
                    }
                    ElseIf($strUptime -lt 30)
                    {
                        $strPatched = "$False"
                    }
                }
            Catch{
                    $strLastBoot = "ERROR"
                    $strUptime = "ERROR"
                    $strStatus = "OK"
                    $strPatched = "$False"
                    }
                    $object = New-Object PSObject
                    $object | Add-Member –MemberType NoteProperty –Name 'ComputerName' –Value "$($Server)"
                    $object | Add-Member –MemberType NoteProperty –Name 'StartTime' –Value "$($strLastBoot)"
                    $object | Add-Member –MemberType NoteProperty –Name 'Uptime(Days)' –Value " $(($strUptime))"
                    $object | Add-Member –MemberType NoteProperty –Name 'Status' –Value "$($strStatus)"
                    $object | Add-Member –MemberType NoteProperty –Name 'MightNeedPatched' –Value "$($strPatched)"
                    $Output += $object
                     
            }
            Else
            {
                $object = New-Object PSObject
                $object | Add-Member –MemberType NoteProperty –Name 'ComputerName' –Value "$($Server)"
                $object | Add-Member –MemberType NoteProperty –Name 'StartTime' –Value "OFFLINE"
                # $object | Add-Member –MemberType NoteProperty –Name 'Uptime(Days)' –Value "  - "
                $object | Add-Member –MemberType NoteProperty –Name 'Status' –Value "OFFLINE"
                # $object | Add-Member –MemberType NoteProperty –Name 'MightNeedPatched' –Value "  - "
                $Output += $object
            }
            $Server = ""
            $strOS = ""
            $strLastBoot = ""
            $strUptime = ""
            $strStatus = ""
            $strPatched = ""
        }
         Write-Output $Output | FT -AutoSize
    }
    End
    {
    }
}