Get-Uptime.ps1

function Get-Uptime {
 Param (
 [parameter(ValueFromPipelineByPropertyName)]
 [Alias('name')]
 [string[]]$Computername
 )

 $today = Get-Date
 $array = @()
 $online = @()
 $offline = @()
 
 foreach ($server in $Computername) 
 {
     $ping = Test-Connection -ComputerName $server -Count 1 -Quiet
     if ($ping -eq $true) { $online += $server }
     else { $offline += $server }
 }

 if ($computername)
 {
     foreach ($onlineServer in $online)
     {
         $tempArray = Get-CimInstance -ClassName win32_operatingsystem -computername $onlineServer -ErrorAction SilentlyContinue | select `
         @{label="ComputerName";expression={$_.PSComputerName}},`
         @{label="StartTime";expression={$_.LastBootUpTime}},`
         @{label="Uptime (Days)";expression={(New-TimeSpan -Start $_.LastBootUpTime.ToShortDateString() -End $today.ToShortDateString()).Days}},`
         @{label="Status";expression={$_.Status}}
     }

     if ($tempArray.StartTime -eq $null)
     {
         $temp = @{}
         $temp.ComputerName = $onlineServer
         $temp.StartTime = "-"
         $temp."Uptime (Days)" = "-"
         $temp.Status = "ERROR"
         $tempObject = New-Object PSobject -Property $temp
         $array += $tempObject
     }
 
     else {$array += $tempArray}

     foreach ($serverName in $offline)
     {
         $offlineArray = @{}
         $offlineArray.ComputerName = $serverName
         $offlineArray.StartTime = "-"
         $offlineArray."Uptime (Days)" = "-"
         $offlineArray.Status = "OFFLINE"
         $offlineObject = New-Object PSobject -Property $offlineArray
         $array += $offlineObject
     }
 }

 else
 {
     $tempArray = Get-CimInstance -ClassName win32_operatingsystem -computername $env:COMPUTERNAME | select `
     @{label="ComputerName";expression={$_.PSComputerName}},`
     @{label="StartTime";expression={$_.LastBootUpTime}},`
     @{label="Uptime (Days)";expression={(New-TimeSpan -Start $_.LastBootUpTime.ToShortDateString() -End $today.ToShortDateString()).Days}}
     @{label="Status";expression={$_.Status}}

     if ($tempArray.StartTime -eq $null)
     {
         $temp = @{}
         $temp.ComputerName = $onlineServer
         $temp.StartTime = "-"
         $temp."Uptime (Days)" = "-"
         $temp.Status = "ERROR"
         $tempObject = New-Object PSobject -Property $temp
         $array += $tempObject
     }
 
     else {$array += $tempArray}
 }
 
 foreach ($row in $array) 
 {
     if ($row."Uptime (Days)" -eq "-") {$value = "-"}
     elseif ($row."Uptime (Days)" -ge 30) {$value = "True"}
     elseif ($row."Uptime (Days)" -lt 30) {$value = "False"}
     $row | Add-Member -MemberType NoteProperty -Name MightNeedPatched -Value ($value)
 }
 
 $array | ft ComputerName,StartTime,"Uptime (Days)",Status,MightNeedPatched -AutoSize

}
　
Get-Uptime -Computername #comma sperated computer names here

Get-Uptime function; January PowerShell.org Scripting Games.
7 Requirements + Bonus.