Answer to http://powershell.org/wp/2016/01/02/january-2016-scripting-games-puzzle/

Get-Uptime.ps1

<#
.Synopsis
   Gets uptime information
.EXAMPLE
   Get-Uptime -ComputerName URANUS
.INPUTS
   String[]
.OUTPUTS
   CUSTOM.UptimeInfo
.NOTES
    The MightNeedPatched property is not displayed by default.
.LINK
    http://powershell.org/wp/2016/01/02/january-2016-scripting-games-puzzle/
#>
function Get-Uptime
{
    [CmdletBinding()]
    [OutputType([psobject])]
    Param
    (
        # Computer(s) to query for Uptime
        [Parameter(ValueFromPipeline=$true,
                   Position=0)]
        [string[]]$ComputerName = 'localhost'
    )

    Begin
    {
        Update-TypeData -TypeName CUSTOM.UptimeInfo -DefaultDisplayPropertySet ComputerName, StartTime, 'Uptime (Days)', Status -Force
    }
    Process
    {
        foreach ( $Computer in $ComputerName ) {
            if ( $Computer -eq '.' ) { $Computer = 'localhost' }
            $properties = @{
                ComputerName = $Computer
                StartTime = $null
                'Uptime (Days)' = $null
                Status = $null
                MightNeedPatched = $null
            }

            if ( Test-Connection -ComputerName $Computer -Quiet -Count 1 ) {
                Try {
                    $wmi = gwmi -Class Win32_OperatingSystem -ComputerName $Computer
                    $properties.ComputerName = $wmi.PSComputerName
                    $Properties.StartTime = $wmi.ConvertToDateTime($wmi.LastBootUpTime)
                    $Properties.'Uptime (Days)' = [math]::round((( Get-Date ) - $Properties.StartTime).TotalDays,1)
                    $Properties.Status = 'OK'
                    $Properties.MightNeedPatched = ($Properties.'Uptime (Days)' -gt 30)
                }
                Catch {
                    $properties.Status = 'ERROR'
                }
            } else {
                $properties.Status = 'OFFLINE'
            }
            $row = New-Object -TypeName psobject -Property $properties
            $row.PSTypeNames.Insert(0,'CUSTOM.UptimeInfo')
            Return $row
        }
    }
}