echo │ 3.数字与字母不可混用；数字行或字母行首尾均无 │
echo │ │
echo │ 任何符号，其间用逗号分隔；请严格按照本格式填写！ │
echo │ │
echo ╰────────────────────────────╯
echo.
echo 返回上一步请按 1 退出请按 0
echo ──────────────────────────────
echo 每天都备份请按 A
echo.
set copydate=
set /p copydate= 请输入备份日期：
if "%copydate%"=="" goto input_date
if "%copydate%"=="," goto input_date
if "%copydate%"=="0" exit
if "%copydate%"=="1" goto input_destination
if "%copydate%"=="1," goto input_time
if /i "%copydate%"=="a" goto all_date
:: 检查日期输入是否正确
set num=0
set char=%copydate%
for /f "tokens=1 delims=," %%i in ("%char%") do (
echo "%%i"|findstr /i "M T W Th F S Su">nul && goto check_alphabetical_date|| goto check_numerical_date
)
:check_alphabetical_date
call :check_alp
