ADTimeFunction.PS1

function Get-ADTime {
Param(
    [Switch]$IncludeUptime
)
$pdcName = Get-ADForest | Select-Object -ExpandProperty RootDomain | Get-ADDomain | Select-Object -ExpandProperty PDCEmulator
net time \\$pdcName /set /y

$outtab = @()
(Get-ADForest).GlobalCatalogs | sort | % { 
    $rawtime = w32tm /stripchart /computer:$_ /dataonly /samples:1 | Select -Last 1
    $out = "" | Select DC, LocalTime, OffsetFromLocal
    $out.DC = $_
    $out.LocalTime = $rawTime.Split(",")[0].Trim()
    $out.OffsetFromLocal = [float]($rawTime.Split(",")[1].Trim() -replace "s","")
    if ($IncludeUptime) {
	    $lastboot = (Get-CimInstance -ComputerName $_ -ClassName win32_operatingsystem).lastbootuptime
      $uptime = [Math]::Round(((Get-Date) - $lastboot).TotalDays,1)
      $out | Add-Member NoteProperty UpDays $Uptime
    }
    $out
  }
}