How to Enable or Disable NTP Time Synchronization in Batch Script

@echo off
setlocal

:: Verify Admin Rights
net session >nul 2>&1
if %errorlevel% neq 0 (
    echo [ERROR] Administrator privileges required.
    pause
    exit /b 1
)

echo Enabling NTP Time Synchronization...

:: 1. Ensure the Windows Time Service is set to start automatically
sc config w32time start= auto >nul 2>&1

:: 2. Start the service if not already running
net start w32time >nul 2>&1
:: errorlevel 0 = started successfully, 2 = already running
if %errorlevel% neq 0 if %errorlevel% neq 2 (
    echo [ERROR] Failed to start the Windows Time Service.
    pause
    exit /b 1
)

:: 3. Configure the NTP server peer list
::    0x8 flag = Client mode (standard for NTP client machines)
w32tm /config /manualpeerlist:"pool.ntp.org,0x8 time.windows.com,0x8" /syncfromflags:manual /update >nul 2>&1
if %errorlevel% neq 0 (
    echo [ERROR] Failed to configure NTP peers.
    pause
    exit /b 1
)
echo [OK] NTP peers configured.

:: 4. Force an immediate synchronization with peer rediscovery
w32tm /resync /rediscover >nul 2>&1

if %errorlevel% equ 0 (
    echo [SUCCESS] Time synchronized successfully.
    echo.
    w32tm /query /status 2>nul | findstr /i /c:"Source:" /c:"Last Successful"
) else (
    echo.
    echo [WARNING] Sync attempt failed. The time service is configured
    echo          but the NTP server may be unreachable.
    echo          Verify internet access and that UDP port 123 is not blocked.
)

echo.
pause

@echo off
setlocal

:: Verify Admin
net session >nul 2>&1
if %errorlevel% neq 0 (
    echo [ERROR] Must run as Administrator.
    pause
    exit /b 1
)

echo Disabling NTP Time Synchronization...

:: 1. Stop the Windows Time Service
net stop w32time >nul 2>&1
:: errorlevel 0 = stopped successfully, 2 = was already stopped
if %errorlevel% equ 0 (
    echo [OK] Windows Time Service stopped.
) else if %errorlevel% equ 2 (
    echo [INFO] Windows Time Service was already stopped.
) else (
    echo [WARNING] Could not stop the Windows Time Service.
)

:: 2. Disable the service from starting automatically
sc config w32time start= disabled >nul 2>&1
if %errorlevel% equ 0 (
    echo [OK] Service startup type set to Disabled.
) else (
    echo [WARNING] Could not change service startup type.
)

echo.
echo [SUCCESS] NTP synchronization disabled.
echo The Windows Time Service has been stopped and will not start on boot.
echo.
echo To re-enable, run:
echo   sc config w32time start= auto
echo   net start w32time
echo   w32tm /resync

pause

@echo off
setlocal

echo =============================================
echo       NTP SYNCHRONIZATION STATUS
echo =============================================
echo.

:: 1. Check if the service is running
sc query w32time 2>nul | findstr /i "RUNNING" >nul
if %errorlevel% equ 0 (
    echo Service Status:    RUNNING
) else (
    echo Service Status:    NOT RUNNING
)

:: 2. Display the configured NTP source
echo.
echo Time Source:
w32tm /query /source 2>nul || echo   [Not available - service may be stopped]

:: 3. Display the last sync status
echo.
echo Synchronization Details:
w32tm /query /status 2>nul | findstr /i /c:"Source:" /c:"Last Successful" /c:"Poll Interval"
if %errorlevel% neq 0 echo   [Could not retrieve status - service may be stopped]

:: 4. Display the configured peers
echo.
echo Configured Peers:
w32tm /query /peers 2>nul
if %errorlevel% neq 0 echo   [Could not retrieve peers - service may be stopped]

pause

@echo off
setlocal

:: Verify Admin
net session >nul 2>&1
if %errorlevel% neq 0 (
    echo [ERROR] Administrator privileges required.
    pause
    exit /b 1
)

:: Set sync interval to 1 hour (3600 seconds)
set "interval_seconds=3600"

echo Setting NTP sync interval to %interval_seconds% seconds...

:: 1. Update the SpecialPollInterval in the registry
REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient" /v SpecialPollInterval /t REG_DWORD /d %interval_seconds% /f >nul
if %errorlevel% neq 0 (
    echo [ERROR] Failed to update SpecialPollInterval in the registry.
    pause
    exit /b 1
)

:: 2. Reconfigure peers with the 0x9 flag to enable SpecialPollInterval
::    0x9 = 0x8 (Client mode) + 0x1 (Use SpecialPollInterval)
w32tm /config /manualpeerlist:"pool.ntp.org,0x9 time.windows.com,0x9" /syncfromflags:manual /update >nul 2>&1
if %errorlevel% neq 0 (
    echo [ERROR] Failed to reconfigure NTP peers.
    pause
    exit /b 1
)

:: 3. Restart the service to apply all changes
net stop w32time >nul 2>&1
net start w32time >nul 2>&1

:: 4. Force initial sync
w32tm /resync /rediscover >nul 2>&1

if %errorlevel% equ 0 (
    echo [OK] Sync interval set to %interval_seconds% seconds.
    echo.
    w32tm /query /status 2>nul | findstr /i /c:"Source:" /c:"Poll Interval"
) else (
    echo [WARNING] Configuration saved but initial sync failed.
    echo          The interval will take effect when a time server becomes reachable.
)

pause

:: WRONG - The service must be active for w32tm commands to work
w32tm /resync

:: RISKY - If this one server goes down, sync fails entirely
w32tm /config /manualpeerlist:"my-company-clock.local" /syncfromflags:manual /update

:: WRONG - The registry value alone does nothing without 0x1 peer flags
REG ADD "HKLM\SYSTEM\...\NtpClient" /v SpecialPollInterval /t REG_DWORD /d 3600 /f
net stop w32time & net start w32time