'&cls&for /f "tokens=1,2" %%a in ('cscript -nologo -e:vbscript "%~f0"') do @date %%a&time %%b&pause&exit/b
WSH.echo DateAdd("s", -30, now)
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@echo off
title 修改系统时间为30秒前
setlocal enabledelayedexpansion 
echo 修改前^: %time%
for /f "delims=^: tokens=1,2,3*" %%i in ("%time%") do (
  set TH=%%i
  if "!TH:~0,1!"=="0" set/a TH=!TH:~1,1!
  set TN=%%j
  if "!TN:~0,1!"=="0" set/a TN=!TN:~1,1!
  set TS=%%k
  set TS=!TS:~0,2!
  if "!TS:~0,1!"=="0" set/a TS=!TS:~1,1!
)
set/a SS=%TH%*3600 + %TN%*60 + %TS%
set/a SS=%SS% - 30  && @REM 向前30秒
set/a TH=%SS% / 3600
set/a TN=(%SS% - %TH% * 3600) / 60
set/a TS=%SS% - (%TH% * 3600) - (%TN% * 60)
set TH=00%TH%
set TN=00%TN%
set TS=00%TS%
set TH=%TH:~-2%
set TN=%TN:~-2%
set TS=%TS:~-2%
time %TH%^:%TN%^:%TS%
if %errorlevel%==0 echo 修改后^: %time%
pause
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