Get-ServerInfo.ps1

Function Get-ServerInfo {
[CmdletBinding()]
Param()
Begin {
 try {
  $cv = Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion' -ErrorAction 'Stop'
 } catch {
  Throw "Failed to read the registry because $($_.Exception.Message)"
 }
}
Process {
 try {
 if ($cv.InstallationType -match 'Server') {
  [PSCustomObject]@{
   Branch = $(if($cv.ReleaseId){$cv.ReleaseId} else { $cv.CurrentVersion })
   ProductName = $cv.ProductName
   Build = $cv.CurrentBuild
   Revision = $cv.UBR
   Channel = $(if ($cv.ProductName -notmatch '\s\d{4}\s') { 'Semi-Annual Channel (SAC)' } else { 'Long Term Support (LTS)' })
   isSAC = $(if ($cv.ProductName -match '\s\d{4}\s') { $false } else { $true })
   isLTS = $(if ($cv.ProductName -notmatch '\s\d{4}\s') { $false } else { $true })
  } | 
  Add-Member -MemberType ScriptProperty -Name isExpired -Value  {
   $y,$m = $this.Branch -split '(?<=\G.{2})'
   if($this.isSAC -and ((Get-Date) -gt ((Get-Date -Year "20$($y)" -Month "$($m)").AddMonths(18)))) {
     $true 
    } else {
     $false
    }
  } -Force -PassThru -ErrorAction 'Stop'
 }
 } catch {
  Throw "Failed to get server info because $($_.Exception.Message)"
 }
}
End {}
<#
.SYNOPSIS
  Get information about the server branch, channel, build,...

.DESCRIPTION
  Get information about the server:
   branch,
   channel (SAC = Semi Annual Channel or LTS = Long Term Support)
   build
   revision,
   product name
 by reading the registry key 
 HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion
 
.EXAMPLE
  Get-ServerInfo

  Branch      : 1809
  ProductName : Windows Server 2019 Datacenter
  Build       : 17763
  Revision    : 437
  Channel     : Long Term Support (LTS)
  isSAC       : False
  isLTS       : True
  isExpired   : False

.EXAMPLE
  Get-ServerInfo

  Branch      : 1709
  ProductName : Windows Server Datacenter
  Build       : 16299
  Revision    : 1087
  Channel     : Semi-Annual Channel (SAC)
  isSAC       : True
  isLTS       : False
  isExpired   : True

.EXAMPLE
  Get-ServerInfo

  Branch      : 1903
  ProductName : Windows Server Standard
  Build       : 18362
  Revision    : 113
  Channel     : Semi-Annual Channel (SAC)
  isSAC       : True
  isLTS       : False
  isExpired   : False

.EXAMPLE
  Get-ServerInfo

  Branch      : 6.3
  ProductName : Windows Server 2012 R2 Standard
  Build       : 9600
  Revision    : 19356
  Channel     : Long Term Support (LTS)
  isSAC       : False
  isLTS       : True
  isExpired   : False

#>
}