@echo off
setlocal enabledelayedexpansion
for /f "tokens=1,2,3 delims=-" %%i in ('echo %date%') do (
set d=%%i%%j%%k
set /a d1=!d!-30
for /f "tokens=*" %%a in ('dir /b /s D:\back') do (
set var=%%~ta
set var1=!var:~0,10!
if "!var1!" LEQ "!d1!" (
del "%%a" /f /s /q
rd "%%a" /s /q
)
)
)
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