解答： @echo off for %%i in (*.dat) do call :goren %%i goto end
:goren set /p firstln=%1 set year=%firstln:~4,1%
if /i %year% GTR 0 (set month=0%firstln:~0,1% set day=%firstln:~1,2%) else ( set month=%firstln:~0,2% set day=%firstln:~2,2% ) ren %1 c01-%month%%day%.cvs goto end
