WINBATCH

@Echo Off
set "year=1990"
set "month=01"
if %month% == 01 goto d31
if %month% == 02 goto d28
if %month% == 03 goto d31
if %month% == 04 goto d30
if %month% == 05 goto d31
if %month% == 06 goto d30
if %month% == 07 goto d31
if %month% == 08 goto d31
if %month% == 09 goto d30
if %month% == 10 goto d31
if %month% == 11 goto d30
if %month% == 12 goto d31

:d31
for /d %%i IN (0 1 2) DO (
    for %%j IN (0 1 2 3 4 5 6 7 8 9) DO (
        copy "YYYYMMDD我是陳慶全.txt" "%year%%month%%%i%%j我是陳慶全.txt"
    )
)
del "%year%%month%00我是陳慶全.txt"
copy "YYYYMMDD我是陳慶全.txt" "%year%%month%30我是陳慶全.txt"
copy "YYYYMMDD我是陳慶全.txt" "%year%%month%31我是陳慶全.txt"

:d30
for /d %%i IN (0 1 2) DO (
    for %%j IN (0 1 2 3 4 5 6 7 8 9) DO (
        copy "YYYYMMDD我是陳慶全.txt" "%year%%month%%%i%%j我是陳慶全.txt"
    )
)
del "%year%%month%00我是陳慶全.txt"
copy "YYYYMMDD我是陳慶全.txt" "%year%%month%30我是陳慶全.txt"

:d28
for /d %%i IN (0 1 2) DO (
    for %%j IN (0 1 2 3 4 5 6 7 8 9) DO (
        copy "YYYYMMDD我是陳慶全.txt" "%year%%month%%%i%%j我是陳慶全.txt"
    )
)
del "%year%%month%00我是陳慶全.txt"
del "%year%%month%29我是陳慶全.txt"