Test-OSVersionSupport.ps1

<#
    .SYNOPSIS
        Check that the Windows OS version is supported
    .DESCRIPTION
        Build a list based on the Windows OS, Edition and Build Number with a pre-defined 'end of life' date
        to assess if the OS on this machine is still supported
    .LINK
        https://gist.github.com/dancing-groot/af52d6e2fea46704f67ffa324c58d2c2
    .NOTES
        Version:  2024.02.15
        Author:   @dancing-groot

        References:
        https://en.wikipedia.org/wiki/Windows_10_version_history#Channels
        https://learn.microsoft.com/en-us/lifecycle/products/windows-10-enterprise-and-education
        https://en.wikipedia.org/wiki/Windows_11_version_history#Channels
        https://learn.microsoft.com/en-us/lifecycle/products/windows-11-enterprise-and-education
        https://en.wikipedia.org/wiki/List_of_Microsoft_Windows_versions#Server_versions
#>
[cmdletBinding()]
param()

#region FUNCTIONS
function Get-WindowsOSList
{
    [CmdletBinding()]
    param()

    $windowsOSList = @()

    # Put in this format so it's easier to add new entries without relying on an external file
    $rawData = @(
    ("Windows 10 Education", "1507", "10240", "2017.05.09"),
    ("Windows 10 Enterprise", "1507", "10240", "2017.05.09"),
    ("Windows 10 LTSC", "1507", "10240", "2025.10.14"),
    ("Windows 10 Pro", "1507", "10240", "2017.05.09"),
    ("Windows 10 Education", "1511", "10586", "2017.10.10"),
    ("Windows 10 Enterprise", "1511", "10586", "2017.10.10"),
    ("Windows 10 Pro", "1511", "10586", "2017.10.10"),
    ("Windows 10 Education", "1607", "14393", "2019.04.09"),
    ("Windows 10 Enterprise", "1607", "14393", "2019.04.09"),
    ("Windows 10 LTSC", "1607", "14393", "2026.10.13"),
    ("Windows 10 Pro", "1607", "14393", "2018.04.10"),
    ("Windows 10 Education", "1703", "15063", "2019.10.08"),
    ("Windows 10 Enterprise", "1703", "15063", "2019.10.08"),
    ("Windows 10 Pro", "1703", "15063", "2018.10.09"),
    ("Windows 10 Education", "1709", "16299", "2020.10.13"),
    ("Windows 10 Enterprise", "1709", "16299", "2020.10.13"),
    ("Windows 10 Pro", "1709", "16299", "2019.04.09"),
    ("Windows 10 Education", "1803", "17134", "2021.05.11"),
    ("Windows 10 Enterprise", "1803", "17134", "2021.05.11"),
    ("Windows 10 Pro", "1803", "17134", "2019.11.12"),
    ("Windows 10 Education", "1809", "17763", "2021.05.11"),
    ("Windows 10 Enterprise", "1809", "17763", "2021.05.11"),
    ("Windows 10 LTSC", "1809", "17763", "2029.01.09"),
    ("Windows 10 Pro", "1809", "17763", "2020.11.10"),
    ("Windows 10 Education", "1903", "18362", "2020.12.08"),
    ("Windows 10 Enterprise", "1903", "18362", "2020.12.08"),
    ("Windows 10 Pro", "1903", "18362", "2020.12.08"),
    ("Windows 10 Education", "1909", "18363", "2022.05.10"),
    ("Windows 10 Enterprise", "1909", "18363", "2022.05.10"),
    ("Windows 10 Pro", "1909", "18363", "2021.05.11"),
    ("Windows 10 Education", "2004", "19041", "2021.12.14"),
    ("Windows 10 Enterprise", "2004", "19041", "2021.12.14"),
    ("Windows 10 Pro", "2004", "19041", "2021.12.14"),
    ("Windows 10 Education", "20H2", "19042", "2023.05.09"),
    ("Windows 10 Enterprise", "20H2", "19042", "2023.05.09"),
    ("Windows 10 Pro", "20H2", "19042", "2022.05.10"),
    ("Windows 10 Education", "21H1", "19043", "2022.12.13"),
    ("Windows 10 Enterprise", "21H1", "19043", "2022.12.13"),
    ("Windows 10 Pro", "21H1", "19043", "2022.12.13"),
    ("Windows 10 Education", "21H2", "19044", "2024.06.11"),
    ("Windows 10 Enterprise", "21H2", "19044", "2024.06.11"),
    ("Windows 10 LTSC", "21H2", "19044", "2027.01.12"),
    ("Windows 10 Pro", "21H2", "19044", "2023.06.13"),
    ("Windows 10 Education", "22H2", "19045", "2025.10.14"),
    ("Windows 10 Enterprise", "22H2", "19045", "2025.10.14"),
    ("Windows 10 Pro", "22H2", "19045", "2025.10.14"),
    ("Windows 11 Education", "21H2", "22000", "2024.10.08"),
    ("Windows 11 Enterprise", "21H2", "22000", "2024.10.08"),
    ("Windows 11 Pro", "21H2", "22000", "2023.10.10"),
    ("Windows 11 Education", "22H2", "22621", "2025.10.14"),
    ("Windows 11 Enterprise", "22H2", "22621", "2025.10.14"),
    ("Windows 11 Pro", "22H2", "22621", "2024.10.08"),
    ("Windows 11 Education", "23H2", "22631", "2026.11.10"),
    ("Windows 11 Enterprise", "23H2", "22631", "2026.11.10"),
    ("Windows 11 Pro", "23H2", "22631", "2025.11.25"),
    ("Windows Server", "2008 R2", "7601", "2020.01.14"),
    ("Windows Server", "2012 R2", "9600", "2020.01.14"),
    ("Windows Server", "2016", "14393", "2027.01.12"),
    ("Windows Server", "2019", "17763", "2029.01.09"),
    ("Windows Server", "2022", "20348", "2031.10.14")
    )

    $rawData | ForEach-Object { $windowsOSList += [PSCustomObject]@{Type = $_[0]; Version = $_[1]; Build = $_[2]; EOL = $_[3] } }

    return $windowsOSList
} # Get-WindowsOSList

function Format-Date
{
    [CmdletBinding()]
    param(
        [ValidatePattern("\d{4}\.\d{1,2}\.\d{1,2}")][string]$Date
    )

    return [DateTime]$Date
} # Format-Date

function Test-OS
{
    [CmdletBinding(DefaultParameterSetName = "Supported")]
    param(
        [Parameter(Mandatory = $true, ParameterSetName = 'Supported')][switch]$Supported,
        [Parameter(Mandatory = $true, ParameterSetName = 'DaysLeft')][switch]$DaysLeft,
        [Parameter(Mandatory = $true, ParameterSetName = 'Detailed')][switch]$Detailed
    )

    try
    {
    $windowsInfo = Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object Caption, BuildNumber, @{Name = "Type"; Expression = "." }
    }
    catch
    {
        $windowsInfo = Get-WmiObject -Class Win32_OperatingSystem | Select-Object Caption, BuildNumber, @{Name = "Type"; Expression = "." }
    }

    switch -Wildcard ($windowsInfo.Caption)
    {
        "*Windows 10*"
        {
            switch -Wildcard ($windowsInfo.Caption)
            {
                "*LTSC" { $WindowsInfo.Type = "Windows 10 LTSC"; break }
                "*Pro*" { $WindowsInfo.Type = "Windows 10 Pro"; break }
                "*Education" { $WindowsInfo.Type = "Windows 10 Education"; break }
                "*Enterprise" { $WindowsInfo.Type = "Windows 10 Enterprise"; break }
            }
        }
        "*Windows 11*" { $WindowsInfo.Type = "Windows 11"; break }
        "*Windows Server*" { $WindowsInfo.Type = "Windows Server"; break }
    }

    $deviceInfo = $Script:Support | Where-Object { $_.Type -eq $windowsInfo.Type -and $_.Build -eq $windowsInfo.BuildNumber }
    if ($null -eq $deviceInfo) { $deviceInfo = @{Type = "NOT DETECTED OR ANCIENT"; Version = "0"; EOL = "0001.01.01"}}

    switch ($true)
    {
        $Supported
        {
            if ((Format-Date -Date $deviceInfo.EOL) -lt (Get-Date)) { return $false } else { return $true }
        }
        
        $DaysLeft
        {
            return ((Format-Date -Date $deviceInfo.EOL) - (Get-Date)).Days
        }

        $Detailed
        {
            return $deviceInfo | Select-Object Type, Version, @{ Name = "End Of Life"; Expression = { (Format-Date -Date $_.EOL).ToString('dd MMMM yyyy') } }, @{ Name = "Days Remaining"; Expression = { ((Format-Date -Date $_.EOL) - (Get-Date)).Days } }
        }
    }
} # Test-OS
#endregion FUNCTIONS

#region DECLARATION
$Support = Get-WindowsOSList
#endregion DECLARATION

#region MAIN
Test-OS -Supported
Test-OS -DaysLeft
Test-OS -Detailed
#endregion MAIN