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Silver member 【26933062】, if you see this, please help improve it!!! Thanks

When testing that day, a case was missed, that is, now it is June, so we should delete the files and folders before 200801!

But the current situation is that the things before 200701 are deleted! This is incorrect

It seems to be the reason for this section of the command, help analyze it (it seems that the date conversion was also done for the situation like if %mm% gtr 0)

if %mm% leq 0 set /a nn=1
set /a m=(12+mm)%%12,y=yy-nn
if %m% equ 0 set m=12
set m=0%m%
set yy=%y%%m:~-2%




Dear experts, please help, thanks

Originally posted by 26933062 at 2008-5-23 04:10 PM:
The experience is: a large number of practices, and read more others' posts
To run a bat in other positions, more issues need to be considered. The following code is not tested...
:

@echo off&setlocal enabledelayedexpansi ... 


This is the final P

Hehe, I figured it out by myself. Just add one more case before if %mm% leq 0 set /a nn=1. Add: if %mm% gtr 0 set /a nn=0

Originally posted by easonL at 2008-5-26 15:39:
Hehe, I figured it out myself.
Just add another case before if %mm% leq 0 set /a nn=1.

Add:
if %mm% gtr 0 set /a nn=0

That's incorrect.
Modify here:
for /f "tokens=1,2 delims=:-\/. " %%a in ("%date%") do (
set /a yy=%%a,mm=100%%b%%100-5
)

Originally posted by 26933062 at 2008-5-26 03:42 PM:

That's not right,
Modify here
for /f "tokens=1,2 delims=:-\/. " %%a in ("%date%") do (
set /a yy=%%a,mm=100%%b%%100-5
)

Ah? You don't seem to have changed anything. Comparing with the original, I can't see it, heh heh

Silver member 【26933062】Big shot, and by the way, why is my modification like that incorrect? Please give a little analysis, please!

It seems there is indeed an error in the calculation part. Let me think about it.

That's right! What problem are you having now?

There is a mistake! Let me describe the problem:

If it's June now, then we should delete the files and folders before 200801, right?

But it's not like that now. The result is that only the files and folders before 200701 are deleted.

There seems to be a problem with the time calculation! You can take a look

Wait a minute, I'll double - check it carefully!

@echo off

::下面是假设当前日期为2008年6月,可自行修改测试

set date=2008/6

::::::::::::::::::::::::::::::

for /f "tokens=1,2 delims=:-\/. " %%a in ("%date%") do (

   set /a yy=%%a,mm=100%%b%%100-5

)

if %mm% leq 0 set /a nn=1

set /a m=(12+mm)%%12,y=yy-nn

if %m% equ 0 set m=12

set m=0%m%

set yy=%y%%m:~-2%

echo.&echo 删除 %yy% 以前的文件（含%yy%）

echo.&pause

How is that possible?
You test the following code...
:

@echo off

::The following is assuming the current date is June 2008, you can modify it yourself for testing

set date=2008/6

::::::::::::::::::::::::::::::

for /f "tokens=1,2 delims=:-\/. " %%a in ("%date%") do (

   set /a yy=%%a,mm=100%%b%%100-5

)

if %mm% leq 0 set /a nn=1

set /a m=(12+mm)%%12,y=yy-nn

if %m% equ 0 set m=12

set m=0%m%

set yy=%y%%m:~-2%

echo.&echo Delete files before %yy% (including %yy%)

echo.&pause

Swe sweat~~~~~~~~~~
Why is the test result different from just now! It should be no problem!
I'm really sorry! I wasted your time

But it's really strange ah, I'll take a look at what happened just now by myself