Question

What would the Windows command line script be to rename a folder from the current month, to the current month – 3, using the format YYYY-MM ?

e.g.:

c:\myfiles\myFolder\

should become:

c:\myfiles\2009-01\

Answer 1

For my locale, I need something different.

Also you need to deal with single-digit months, I suppose.

setlocal
@REM example:  Thu 06-11-2009
set stamp=%DATE%

@REM get the year
set year=%stamp:~10,4%
@REM example: 2009

@REM get the month
set month=%stamp:~4,2%
@REM example:  06

@REM subtract 3 months
set /a month=%month%-3
@REM example:  3

@REM test if negative (we rolled back beyond January 1st)
if %month% LSS 1  (
  set /a month=%month%+12
  @REM example: 8
  set /a year=%year%-1
  @REM example: 2008
)

@REM prepend with zero for single-digit month numbers
set month=0%month%

@REM take last 2 digits of THAT
set month=%month:~-2%

set newFolder=%year%-%month%

@REM move %1 %newFolder%
endlocal