[日期时间] 批处理如何批量修改日期为前缀的文件名？

@echo off
setlocal enabledelayedexpansion
for /f "tokens=1* delims= " %%a in ('dir /b *.xls') do (
    set stamp=%%a
    set year=!stamp:~0,4!
    set month=1!stamp:~4,2!
    if !month! equ 112 (
        set month=101
        set /a year+=1
    ) else (
        set /a month+=1
    )
    ren "%%a %%b" "!year!!month:~-2! %%b"
)
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@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in ('dir /a-d /b *.xls') do (
  set "str=%%a"
  set "str1=!str:~,6!"
  if "!str1:~4,2!"=="12" (set/a str1+=89
  ) else set/a str1+=1
  ren "%%a" "!str1!!str:~6!"
)
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