Syncs Windows Time from an External Time Source (a Windows PowerShell script).

Sync-WindowsTime.ps1

<#
Sync-WindowsTime.ps1
#>


# Requires administrator rights
$empty_line = ""


# Check if the PowerShell session is elevated (has been run as an administrator)
# Credit: alejandro5042: "How to run exe with/without elevated privileges from PowerShell" http://stackoverflow.com/questions/29266622/how-to-run-exe-with-without-elevated-privileges-from-powershell?rq=1
If (([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]"Administrator") -eq $false) {
    $empty_line | Out-String
    Write-Warning "It seems that this script is run in a 'normal' PowerShell window."
    $empty_line | Out-String
    Write-Verbose "Please consider running this script in an elevated (administrator-level) PowerShell window." -Verbose
    $empty_line | Out-String
    $admin_text = "For performing system altering procedures, such as removing scheduled tasks, disabling services or writing the registry the elevated rights are mandatory. An elevated PowerShell session can, for example, be initiated by starting PowerShell with the 'run as an administrator' option."
    Write-Output $admin_text
    $empty_line | Out-String
    "Exiting without making any changes to the system." | Out-String
    Return ""
} Else {
    $continue = $true
} # Else


# Check if the computer is connected to the Internet
# Credit: ps1 "Test Internet connection": http://powershell.com/cs/blogs/tips/archive/2011/05/04/test-internet-connection.aspx
$empty_line | Out-String
If (([Activator]::CreateInstance([Type]::GetTypeFromCLSID([Guid]'{DCB00C01-570F-4A9B-8D69-199FDBA5723B}')).IsConnectedToInternet) -eq $false) {
    "The Internet connection doesn't seem to be working. Exiting without syncing the time." | Out-String
    Return ""
} Else {
    $continue = $true
} # Else


# Set the Windows Time sync parameters
# Credit: Adrian K: "How to Sync Time from External Time Source?" http://adriank.org/windows-server-2008-r2-sp1-sync-time-external-time-source/
# W32tm /query /configuration
W32tm /config /manualpeerlist:"time.windows.com,0x1" /syncfromflags:MANUAL /reliable:YES /update
W32tm /config /update
Stop-Service  -Name "W32Time"
Start-Service -Name "W32Time"


# Sync Windows Time from an External Time Source
W32tm /resync
$empty_line | Out-String


# Credit: Adrian K: "How to Sync Time from External Time Source?" http://adriank.org/windows-server-2008-r2-sp1-sync-time-external-time-source/
# Credit: alejandro5042: "How to run exe with/without elevated privileges from PowerShell" http://stackoverflow.com/questions/29266622/how-to-run-exe-with-without-elevated-privileges-from-powershell?rq=1
# Credit: ps1 "Test Internet connection": http://powershell.com/cs/blogs/tips/archive/2011/05/04/test-internet-connection.aspx
# Source: http://support.microsoft.com/kb/816042 (about the 0x1 flag)
# Source: https://docs.microsoft.com/en-us/windows-server/networking/windows-time-service/windows-time-service-tools-and-settings
# Home: https://gist.github.com/auberginehill/299857bdf861cc70578fbef699c458a3

[Reserved]