Vista - Simply script i suppose

Hi!.
At the first of all tell you i have no idea about scripting and zero idea
about vbs.
I have this script 1 that it copy files name starts "dife" from f unit to g
unit, but
now i'm trying it copy files name with starts "dife" and date of previous
day
(script 2)

Script 1

C:\WINDOWS\system32\robocopy F:\ G:\ Dife*.*

Script 2
for /f "usebackq tokens=1,2,3 delims=/" %%i IN (`DATE /T`) do set
tmpfecha=%%k%%j%%i
for /f "usebackq tokens=1,2,3 delims= " %%i in (`echo %tmpfecha%`) do set
mifecha=%%i%%k%%j
set cont=1
set /a mifecha2=%mifecha%-%cont%
C:\WINDOWS\system32\robocopy F:\ G:\ "Dife*%mifecha2%.*"

This substract one day to mifecha, but if day of mifecha is 20090601 result
of mifecha2 is 20090600 instead of 20090531 or 20090530 depending month. Of
course february only have 28 days.

Any one knows script to control this for windows 2003 server?
Thanks a lot.

Have a look at my reply to your identical post in the Server
newsgroup, then check out this link to see why multiposting is not a
good idea. Use crossposting instead if you wish to increase the size
of your audience. http://www.blakjak.demon.co.uk/mul_crss.htm