lengmoke

@echo off
setlocal EnableDelayedExpansion
for /f %%i in (a.txt) do (
    set str=%%i
    set str=20!str:~2,2!年!str:~4,2!月--20!str:~10,2!年!str:~12,2!月--20!str:~18,2!年!str:~20,2!月
    echo !str:年0=年!
)COPY