[日期时间] 批处理如何根据日期判断删除日志文件夹，尤其是跨年操作？

@echo off&setlocal enabledelayedexpansion
set old=&set new=
for /f "delims=" %%i in ('dir /b /od /ad c:\log|findstr "^[0-9][0-9][0-9][0-9][0-9][0-9]$"') do (
  if defined new set "old=!new!"
  set "new=%%i"
)
rd /s /q c:\log\%old%
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schtasks /create /tn rd_per_1st /tr "c:\log\test.bat" /sc monthly /d 1 /f
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@echo off
set/a riqi=%date:~,4%*12+1%date:~5,2%-101,year=riqi/12,month=riqi-year*12+100
if %month%==100 set/a year-=1,month=112
rd /s /q "C:/LOG/%year%%month:~1,2%"
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@echo off
set/a riqi=%date:~,4%*100+%date:~5,2%-1,n=riqi%%100
if %n%==0 set/a riqi-=88
rd /s /q "C:/LOG/%riqi%"
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