batch file rename date

I can't post a link at the mo. Because on mobile but I have written an article here on how to do such things.   Using %date%a variable is pretty unreliable as the date format can be all sorts of things, and at the moment your says to take 4 chars off the beginning and then change any /adding chars to -.  It wont add 0's when it is 1 March say and if the date doesnt have week day at start more issues...

So personally I nearly always use a one line vbscript in the batch file.  Really easy to do and 100% reliable as VBscript does dates natively.

If you click on my dragon-it link you should be able to see the article details.  There are examples in there to get you any date and time format you want.

Steve

@qlemo.  I get an error when trying to run your batch file:
error:
The following usage of the path operator in batch-parameter
substitution is invalid: %~xa"

@TDLewis.  Thanks for  your reply. When I try your method:

@echo off
set today=for /f "tokens=2-4 delims=/ " %%a in ('date /T') do set year=%%c
for /f "tokens=2-4 delims=/ " %%a in ('date /T') do set month=%%a
for /f "tokens=2-4 delims=/ " %%a in ('date /T') do set day=%%b
set today=%year%%month%%day%
for %%a in ("filename.txt.txt") do ren "%%~a" "%%~na%today:/=%%%~xa"

The file gets renamed but not with the year.  I get the following
filename1226.txt    I need it to be renamed to filename20121226.txt for today's date.

@tdlewis when I run the command date /T
I get:
 Wed 12/26/2012

@tdlewis:  
When I add the four lines in to the batch file:
echo year: %year%
echo month: %month%
echo day: %day%
echo today: %today%

I get back
year:
month: 12
today: 1226

that worked, fantastic!. Thanks.

You see my point then perhaps about why not to use date /T or %date% .... different machine, different user, language, date format (ddd dd/mm/yyyy, mm/dd/yyyy etc. And it breaks.

Dragon is correct about the fragile usage of %date% and date /t. In a restricted environment it works as expected, but it might not work on other machines.

My code was only missing one out of 3 percent signs:

@echo off
REM %date% is ddd, mm/dd/yyyy
set yyyymmdd=%date:~-4%%date:~-10,2%%date:~-7,2%
for %%a in ("filename.txt") do ren "%%~a" "%%~na%yyyymmdd%%%~xa"

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