[数值计算] 批处理怎样自动记时关机？

@echo for each os in getobject _ >bt.vbs
@echo ("winmgmts:\\.\root\cimv2:win32_operatingsystem").instances_ >>bt.vbs
@echo wscript.echo os.lastbootuptime:next >>bt.vbs & cscript //nologo bt.vbs & del bt.vbs 
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@echo off
if not exist date.txt goto 1
for /f "delims=&" %%i in (date.txt) do (
    if %%i==%date% goto 3
)
goto 1

:3
if not exist shutdown.txt goto 1
for /f "delims=:. tokens=1,2" %%i in (shutdown.txt) do (
    set a=%%i
    set b=%%j
)
for /f "delims=:. tokens=1,2" %%a in ('echo %time%') do (
    set c=%%a
    set d=%%b
)

set /a b+=20
if %b% geq 60 (
    set /a b-=60
    set /a a+=1
)
if %a% gtr %c% goto 2
if %c% equ %a% goto re
goto 1

:re
if %b% gtr %d% goto 2
goto 1



:1
@echo off
echo %date%>date.txt
for /f "delims=:. tokens=1,2" %%i in ('echo %time%') do (
    set a=%%i
    set b=%%j
)
set /a b+=45
if %b% geq 60 (
    set /a b-=60
    set /a a+=1
)
at %a%:%b% shutdown -s -t 3
echo %a%:%b%>shutdown.txt
exit

:2
shutdown -s -t 3
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