CS50 Python作业outdated.py代码求助：无效输入未被拦截

我正在完成CS50 Python课程的Problem Set 3作业，目标是实现outdated.py程序：接收两种格式的公元日期（如9/8/1636或September 8, 1636），转换为YYYY-MM-DD格式输出，无效输入需重新提示。

目前我的代码如下：

months = [
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December"
]

def get_date():
    while True:
        date = input("Date: ").title().strip()
        try:
            month, day, year = date.replace("/", " ").replace(",", " ").split()

            if month in months and 1 <= int(day) <= 31:
                month_number = months.index(month) + 1
                print(year, str(month_number).zfill(2), day.zfill(2), sep="-")
                break

            if 1 <= int(month) <= 12 and 1 <= int(day) <= 31:
                print(year, month.zfill(2), day.zfill(2), sep="-")
                break

        except ValueError:
            pass

get_date()

我希望自行排查问题而非直接复制答案，但有两个测试用例未通过：

• 输入October/9/1701未被拦截，程序未按要求重新提示
• 输入September 8 1636未被拦截，程序未按要求重新提示

测试反馈详情：

:) outdated.py exists
:) input of 9/8/1636 outputs 1636-09-08
:) input of September 8, 1636 outputs 1636-09-08
:) input of 10/9/1701 outputs 1701-10-09
:) input of October 9, 1701 outputs 1701-10-09
:) input of " 9/8/1636 " outputs 1636-09-08
:) input of 23/6/1912 results in reprompt
:) input of 10 December, 1815 results in reprompt
:( input of October/9/1701 results in reprompt
    expected program to reject input, but it did not
:) input of 1/50/2000 results in reprompt
:) input of December 80, 1980 results in reprompt
:( input of September 8 1636 results in reprompt
    expected program to reject input, but it did not

内容的提问来源于stack exchange，提问作者kevzoz