China DOS Union

With guidance from all you experts,
@echo off
for /f "tokens=1-3 delims=\" %%i in ('echo %date:~0,10%') do md d:\%%i%%j%%k
I found a way to create, under a specified path, a folder named with the current date, but after trying many methods I still can't create a folder named with yesterday's date ;), does any expert have a good trick? Please give me some pointers:
Thanks!

@echo off & setlocal enabledelayedexpansion
for /f "tokens=1-3 delims=\" %%i in ('echo %date:~0,10%') do set /a yesterday=%%k-1 && md d:\%%i%%j!yesterday!

You'll have to think about the cross-month issue yourself;

Actually, for this kind of cross-month and date problem, vbs is much more powerful

So once it crosses into another month there's no way?
Is there anything more intelligent?