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Greetings San! You're asking for a batch file solution that would better be solved with a HLL or an Excel spreadsheet. Both would deal with 'week 33' that you typed. Week 33 conforms to ISO 8601 Date and Time Standards which I believe you are looking for rather than a calendar date week of say Janua...

If you just want to log each time a batch file is run then you might try something like this:
echo File %0 run on %date% at %time%>>my_log.txt

Post back and re-phrase your question if your problem is not answered.

Best wishes!

I use Robocopy for such tasks but you may be interested in having a look at the information the link below provides.

http://www.xxcopy.com/xxgroup/m08/msg08387.htm

Best wishes!

The lines below work for me with limited testing. Remove the word ECHO if $$$test.txt gives you the desired results.

Best wishes all.

@echo off
for /f "delims=" %%f in (
'dir /b *.*') do (
set name=%%~nxf
ECHO ren "%%~nxf" "a%%~nxf"
)>>$$$test.txt
set name=