@echo off
setlocal

for /f "usebackq delims=" %%i in (
    `@"%systemroot%\system32\mshta.exe" "javascript:try {new ActiveXObject('Scripting.FileSystemObject').GetStandardStream(1).Write(new String(new Enumerator(new ActiveXObject('WbemScripting.SWbemLocator').ConnectServer('.', 'root\\cimv2').ExecQuery('SELECT LocalDateTime FROM Win32_OperatingSystem WHERE Primary = True')).item().LocalDateTime).substr(0, 8 + 6))}; catch (e){}; close();" ^
    1^|more`
) do set sDateTime=%%i

echo %sDateTime%

endlocal
exit /b 0

wmic.exe OS get LocalDateTime

@echo off
for /f "delims=." %%i in ('wmic.exe OS get LocalDateTime ^| find "."') do set sDateTime=%%i
echo %sDateTime%