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

A version using MSHTA and javascript. Change %jsfunc% to whateve jscript function you want to call

@echo off
::Invoke a javascript function using mhta

set jsfunc=new Date().getDay()
set dialog="about:"

for /f "tokens=* delims=" %%p in ('mshta.exe %dialog%') do set ndow=%%p

::get dow string from array of strings  
for /f "tokens=%ndow%"  %%d in ("Mon Tue Wed Thu Fri Sat Sun") do set dow=%%d 

echo dow is : %ndow%  %dow%
pause