Setting a windows batch file variable to the day of the week

Question

I have a windows batch file that runs daily. Wish to log data into a file and want to rotate it (i.e. having at most the last 7 days worth of data).

Looked into the

Answer 1

I Improved Aacini Answer to make it Echo Full day of week Name

So here's my Code

@echo off
for /F "skip=1 tokens=2-4 delims=(-/)" %%A in ('date ^< NUL') do (
   for /F "tokens=1-3 delims=/" %%a in ("%date%") do (
      set %%A=%%a
      set %%B=%%b
      set %%C=%%c
   )
)
set /A mm=10%mm% %% 100, dd=10%dd% %% 100
if %mm% lss 3 set /A mm+=12, yy-=1
set /A a=yy/100, b=a/4, c=4-a+b, e=36525*(yy+4716)/100, f=306*(mm+1)/10,dow=(c+dd+e+f-1523)%%7 + 1
for /F "tokens=%dow%" %%a in ("Sunday Monday Tuesday Wednesday Thursday Friday Saturday ") do set dow=%%a
echo Today is %dow%>"Today is %dow%.txt"
echo Today is %dow%
Pause>Nul

REM Sun Mon Tue Wed Thu Fri Sat
REM Sunday Monday Tuesday Wednesday Thursday Friday Saturday