Get-Uptime.ps1

# Tested version: v5

<#
.Synopsis
   Get Servers up time
.DESCRIPTION
   2016-January Scripting Games Puzzle: Server uptime function
    
.EXAMPLE
PS C:\> Get-Uptime


ComputerName     : DC1
StartTime        : 1/15/2016 12:04:43 PM
Uptime(Days)     : 6
Status           : OK
MightNeedPatched : False
.EXAMPLE
PS C:\> Get-Uptime -computerName "DC1","W7-TEST" | Format-Table -AutoSize

ComputerName StartTime             Uptime(Days) Status  MightNeedPatched
------------ ---------             ------------ ------  ----------------
DC1          1/15/2016 12:04:43 PM            6 OK                 False
W7-TEST                                       6 OFFLINE            False
.EXAMPLE
PS C:\> $list = "DC1","W7-TEST"

PS C:\> $list | Get-Uptime | Format-Table -AutoSize

ComputerName StartTime             Uptime(Days) Status  MightNeedPatched
------------ ---------             ------------ ------  ----------------
DC1          1/15/2016 12:04:43 PM            6 OK                 False
W7-TEST                                       6 OFFLINE            False



#>
function Get-Uptime
{
    [CmdletBinding()]
    Param
    (
        # Computer name parameter
        [Parameter(Position=0,
                   ValueFromPipeline,
                   ValueFromPipelineByPropertyName)
                   ]  
        [ValidateNotNullorEmpty()]    
        [string[]]$computerName = $env:COMPUTERNAME


    )

    Begin
    {
    }
    Process
    {


        foreach($computer in $computerName){
            $LastBootTime = $null
            $sysuptimeDays = $null          
            
            if(Test-Connection $computer -count 1 -Quiet){

                try{
                    $wmi = Get-WmiObject -Class Win32_OperatingSystem -computername $computer -ErrorAction SilentlyContinue
                    $LastBootTime = $wmi.ConvertToDateTime($wmi.LastBootUpTime)
                    $sysuptime = (Get-Date) – $LastBootTime
                    $sysuptimeDays = $sysuptime.Days
                    $status = "OK"

                    # Check Might Need Patched property
                    if($sysuptime.days -ge 30){$mightNeedPatched = $true}
                    else{$mightNeedPatched = $false}
                }

                catch{
                    $status = "ERROR"
                }

                
            }
            else{
                $status = "OFFLINE"
            }

            # Save data in the object
                $obj = [pscustomobject][ordered]@{
                    ComputerName = $computer
                    StartTime = $LastBootTime
                    'Uptime(Days)' = $sysuptime.Days
                    Status = $status
                    MightNeedPatched = $mightNeedPatched
                    }
                
                $obj
        }
    }
    End
    {
    }
}