@echo off
echo * ClockSync v1.0
echo * BreakingSecurity.net
echo.
:: Check that we own administrator access level. 
echo [INFO] Checking Access Level...
net session >nul 2>&1
if %errorLevel% == 0 (
	:: We have the necessary rights, go forward
	echo [INFO] Administrative Access confirmed.
) else (
	:: Error, insufficient privileges. Exit program.
	echo [ERROR] Insufficient Access Level. Please restart script with administrative permission.
	echo.
	echo Press any key to exit...
	pause > nul
	exit
)
:: Check command-line parameter.
:: User can specify any number of minutes for the Resync interval.
:: If there is no user-specified parameter, default one is used.
set /A minutes = 10
if not "%1" == "" (
	set /A minutes=%1
)
:loop
:: Synchronize Clock
:: Use /force parameter to bypass "time change too big" error
w32tm /resync /force
if not errorlevel 0 (
	:: If Error, restart time service
    echo [WARNING] Time Service error. Restarting service...
	net stop w32time
    w32tm /unregister
    w32tm /register
    net start w32time
	w32tm /resync /force
	if not errorlevel 0 (
		:: Unknown error, exit program.
		echo [ERROR] Unknown error.
		echo.
		echo Press any key to exit...
		pause > nul
		exit
	)
)
echo.
echo [SUCCESS] Clock successfully synchronized!
echo Date: %date%
echo Time: %time%
echo.
:: Sleep
set /A seconds = %minutes% * 60
echo [INFO] Sleeping for %minutes% minutes until next synchronization...
echo.
ping 127.0.0.1 -n %seconds% > nul
:: Repeat
goto loop