設置變量時出現無效的數字錯誤

Question

我正在使用this thread的代碼獲取明天的日期。這是因爲如下：

@echo off 

set /a d=%date:~0,2% 
set /a m=%date:~3,2% 
set /a y=%date:~6,4% 

:loop 
    set /a d+=1 

    if %d% gtr 31 (
    set d=1 
    set /a m+=1 

    if %m% gtr 12 (
     set m=1 
     set /a y+=1 
    ) 
) 
xcopy /d:%m%-%d%-%y% /l . .. >nul 2>&1 || goto loop 

echo %d%/%m%/%y% 

但是我收到以下錯誤：雖然在後的文本，它說

Invalid number. Numeric constants are either decimal (17), hexadecimal (0x11), or octal (021).

：

When assigning values to variables, we use using SET /A (rather than just SET) to overcome the problem of attempting to perform octal arithmetic on '08' and '09' later on. This is because leading zeros are trimmed off during arithmetic assignment.

Answer 1

假設，你有前導零日期和月份：

 
set /a d=1%date:~0,2%-100 
set /a m=1%date:~3,2%-100 
set /a y=%date:~6,4%