在Windows批次中减去月份 [英] Subtract month in Windows batch

问题描述

我想进行一次跑步并显示上个月。当我尝试减去月份时，它不会显示月份的最后一天。

I would like to have this run and show the previous month. When I try to subtract the month it makes the last day of the month field not appear.

@echo off

set FirstDay=01

set Month=%date:~4,2% 

set Year=%date:~10,4%



if %Month%==01 set LastDay=31 & goto foundate
if %Month%==02 set LastDay=28 & goto foundate
if %Month%==03 set LastDay=31 & goto foundate
if %Month%==04 set LastDay=30 & goto foundate
if %Month%==05 set LastDay=31 & goto foundate
if %Month%==06 set LastDay=30 & goto foundate
if %Month%==07 set LastDay=31 & goto foundate
if %Month%==08 set LastDay=31 & goto foundate
if %Month%==09 set LastDay=30 & goto foundate
if %Month%==10 set LastDay=31 & goto foundate
if %Month%==11 set LastDay=30 & goto foundate
if %Month%==12 set LastDay=31 & goto foundate



:foundate
echo The year is: %Year%
echo The month is: %Month%
echo First day of this month is: %FirstDay%
echo Last day of this month is: %LastDay%

推荐答案

我已经修改了cyberponk脚本，以解决以下错误

上个月是：-1/2020

I've modified script of cyberponk for following error
Previous month is: -1/2020

if "%'yy'%"=="" set 'yy'=%'aa'%

我已添加为修复程序

if %'mm'% LSS 10 set 'mm'=%'mm':~1,1%

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