@echo off
rem 假设要删除C盘test文件夹里面的十天前的文件
set TarDir=C:\test

>"%tmp%\MyDel.vbs" echo dt=date()-10
>>"%tmp%\MyDel.vbs" echo s=right(year(dt),4) ^& right("0" ^& month(dt),2) ^&  right("0" ^& day(dt),2)
>>"%tmp%\MyDel.vbs" echo wscript.echo s
for /f %%a in ('cscript /nologo %tmp%\MyDel.vbs') do @set DateFlag=%%a
setlocal enabledelayedexpansion
for %%i in (C:\test\*.*) do (
  set t=%%~ti
  set FileDate=!t:~6,4!!t:~0,2!!t:~3,2!
  if !FileDate! lss %DateFlag% del /f "%%i"
)
endlocal
del "%tmp%\MyDel.vbs"