Subtract dates in batch

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---

-----------------------------------------example----------------------------------------
set backdate=2
set yy=yy
set mm=mm
set dd=dd
call :GETDATE "%DATE%"
call :SUBTRACTDAYS %backdate%
-----------------------------------------body--------------------------------------------

:GETDATE
set dt=%~1
set tok=1-3
if "%dt:~0,1%" GTR "9" set tok=2-4
set yyyy=
for /f "tokens=%tok% delims=.:/-, " %%a in ('echo %~1') do (
   for /f "skip=1 tokens=2-4 delims=/-,()." %%x in ('echo.^|date') do 
     set %%x=%%a&set %%y=%%b&set %%z=%%c
)
if not "%yyyy%"=="" set yy=%yyyy%
if 1%yy% LSS 1000 (if %yy% LSS 70 (set yy=20%yy%) else (set yy=19%yy%))
if 1%mm% LSS 100 set mm=0%mm%
if 1%dd% LSS 100 set dd=0%dd%
goto :EOF

:SUBTRACTDAYS
set dayCnt=%1
if "%dayCnt%"=="" set dayCnt=1
REM Substract your days here
set /A dd=1%dd% - 100 - %dayCnt%
set /A mm=1%mm% - 100

:CHKDAY
if /I %dd% GTR 0 goto DONESUBTRACT
set /A mm=%mm% - 1
if /I %mm% GTR 0 goto ADJUSTDAY
set /A mm=12
set /A yy=%yy% - 1
:ADJUSTDAY
if %mm%==1 goto SET31
if %mm%==2 goto LEAPCHK
if %mm%==3 goto SET31
if %mm%==4 goto SET30
if %mm%==5 goto SET31
if %mm%==6 goto SET30
if %mm%==7 goto SET31
if %mm%==8 goto SET31
if %mm%==9 goto SET30
if %mm%==10 goto SET31
if %mm%==11 goto SET30
REM ** Month 12 falls through

:SET31
set /A dd=31 + %dd%
goto CHKDAY

:SET30
set /A dd=30 + %dd%

goto CHKDAY

:LEAPCHK

set /A tt=%yy% %% 4

if not %tt%==0 goto SET28

set /A tt=%yy% %% 100

if not %tt%==0 goto SET29

set /A tt=%yy% %% 400

if %tt%==0 goto SET29

:SET28

set /A dd=28 + %dd%

goto CHKDAY

:SET29

set /A dd=29 + %dd%

goto CHKDAY

:DONESUBTRACT

if /I %mm% LSS 10 set mm=0%mm%
if /I %dd% LSS 10 set dd=0%dd%
goto :EOF