Adding Day Of week to file name in batch file

"If you have no problem calling an external script, you can use VBScript to get the day of week very easily:

the VBScript code:

wscript.echo WeekdayName(Weekday(Date))

Calling it and using it in your filename:

for /f ""delims="" %%a in ('cscript /nologo dayofweek.vbs') do @set myvar=%%a
set filename=backup_%myvar%.bak

then later in your script you can use the variable %filename% to access it. If I ran this today for example, it would create a file called backup_Sunday.bak. Ensure the VBscript file is in the same directory as the batch script."