Rename files to the file date

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This Windows batch file is useful for organizing image files from a digital camera or other source, but can have many other uses.  It simply renames the file(s) to match their create date.  For example, if you took a picture today at 1:40pm and the image file is called IMG_0777.jpg, this utility will rename the file to 20081121_134000.jpg.  Works with multiple files, and will recurse sub-directories with the /s option.

Cut-n-paste the following into notepad and save it as a .BAT file:
@echo off
 setlocal enabledelayedexpansion
 set filespec=%*
 if "%filespec%"=="" goto :help
 for /f "delims=" %%F in ('dir/a-d/b/od %filespec%') do (
   set fn=%%~tF
   set/a hour=0x!fn:~11,2!
   if !hour! GTR 10 set/a hour=(!hour!-6^) %% 12
   if "!fn:~17,2!"=="PM" set/a hour+=12
   if !hour! LSS 10 set hour=0!hour!
   set root=%%~dpF
   set ext=%%~xF
   set nxt=00
   set fn=!fn:~6,4!!fn:~0,2!!fn:~3,2!_!hour!!fn:~14,2!
   if exist "!root!!fn!!nxt!!ext!" for /L %%I in (59,-1,1) do (
     set dup=0%%I
     if not exist "!root!!fn!!dup:~-2!!ext!" set nxt=!dup:~-2!
   @echo ren "%%F" "!fn!!nxt!!ext!"
         ren "%%F" "!fn!!nxt!!ext!"
 dir !root!*!ext! | find/v "Volume"
 goto :end
@echo  Renames files to the date and time the file was created, 
@echo  preserving the file extention:  YYYYMMDD_HHMMSS.ext
@echo  Synatx:  %0 filespec [/s]
@echo  A filespec (such as *.jpg) must be specified.
@echo  /s will recurse sub-folders and rename files matching the filespec.
@echo  Example:  %0  E:\DCIM\*.jpg  /s

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