Make a folder name %prevMonth%"-"%prevYear=%"-01" using batch (.bat) files

Question

I want to create a folder naming it to the previous month. But my code does not seem to work. Here is my code.

@echo off

for /F "tokens=1,3 delims=-" %%a in ("%date%") do (
   set prevYear=%%a
   set month=%%b
)
if "%month:~0,1%" equ "0" set month=%month:~1%
set /A prevMonth=month-1
if "%prevMonth%" equ "0" (
   set /A prevMonth=12, prevYear-=1
)
if %prevMonth% lss 10 set prevMonth=0!prevMonth!

mkdir %prevMonth%"-"%prevYear%"-01"

Any help please.

EDIT: Base on comment.

What output are you getting? `%prevYear=%` is not a valid variable name; it should be `%prevYear%`. — SomethingDark, Oct 18 '17 at 02:12
You're setting variables inside of `for` loops, which means you need to use delayed expansion. — SomethingDark, Oct 18 '17 at 02:31
@SomethingDark i tried setting delayed expansion but it still wont work. I will be reading your link now. — simple guy, Oct 18 '17 at 02:39

score 1 · Accepted Answer · answered Oct 18 '17 at 02:25

1

Here'e an alternative using PowerShell:

@Echo Off
For /F UseBackQ %%A In (
    `PowerShell "(Get-Date).AddMonths(-1).ToString('yyy-MM')"`
) Do If Not Exist "%%A-01\" MD "%%A-01"

answered Oct 18 '17 at 02:25

Compo

36,585
5
27
39

Make a folder name %prevMonth%"-"%prevYear=%"-01" using batch (.bat) files

1 Answers1