[日期时间] 【已解决】批处理删除按照“年月”为名称建立文件夹遇到08月09月时的问题，谢谢

set year=%date:~0,4%
set month=%date:~5,2%
set day=%date:~8,2%
set mydate=%year%%month%%day%
set mymonth=%year%%month%
set filename=oracle9备份%mydate%
set sfilepath=备份\\%mymonth%
E:
cd \ 
rem -------在每个月的1号删除前面2个月的备份--------------
if %day%==01 goto :del_file
echo exit
:del_file
if %month% leq 2  set /a delyear=%year%-1  
if %month% gtr 2  set /a delyear=%year%
if %month% leq 2  set /a delmonth=%month%+10
if %month% gtr 2  set /a delmonth=%month%-2
set delforder=%delyear%%delmonth%
if %day%==01 rd /Q /S 备份\\%delforder%
echo exit
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