@echo off

setlocal EnableDelayedExpansion
set i=0
for %%d in (31 28 31 30 31 30 31 31 30 31 30 31) do (
   set /A i+=1
   set days[!i!]=%%d
)
for /F "tokens=2-4 delims=/ " %%a in ("%date%") do (
   set /A dd=10%%a %% 100-1, mm=10%%b %% 100, yy=%%c %% 100, yyMOD4=yy %% 4
)
if %yyMOD4% equ 0 set days[2]=29
if %dd% gtr !days[%mm%]! (
   set /A dd=1, mm+=1
   if !mm! gtr 12 (
      set /A mm=1, yy+=1
   )
)
if %dd% lss 10 set dd=0%dd%
if %mm% lss 10 set mm=0%mm%

set yesterday=%dd%%mm%%yy%
echo %yesterday%

ren test.txt test_%yesterday%.txt