Outdated

Outdated

This Python program is an implementation to CS50’s Introduction to Programming with Python Week 3 - Outdated Problem Set, named outdated.py, helps you convert dates from the month-day-year (MM/DD/YYYY) format or month day, year format (e.g., September 8, 1636) to the international standard format, which is year-month-day (YYYY-MM-DD). This standard format ensures that dates are consistently sorted and unambiguous, regardless of the country.

How to Run the Program

1. Open your terminal.

2. Navigate to the directory where you have saved the outdated.py file.

   cd path/to/your/directory
   

3. Run the program using the Python interpreter:

   python outdated.py
   

4. The program will prompt you to enter a date in one of the supported formats. You can enter dates in either MM/DD/YYYY format (e.g., 9/8/1636) or month day, year format (e.g., September 8, 1636).

5. After entering the date, the program will process the input and display the date in the standard YYYY-MM-DD format.

Program Code

# outdated.py

def main():
    month_names = [
        "January", "February", "March", "April",
        "May", "June", "July", "August",
        "September", "October", "November", "December"
    ]

    while True:
        date = input("Date: ").strip()
        if "/" in date:
            splitted_date = date.split("/")
            if len(splitted_date) != 3:
                continue
            if not splitted_date[0].isdigit():
                continue
            month = int(splitted_date[0])
            day = int(splitted_date[1])
            year = int(splitted_date[2])
            if month < 1 or month > 12 or day < 1 or day > 31:
                continue
            print(f"{year:04}-{month:02}-{day:02}")
            break
        elif " " in date:
            splitted_date = date.split(" ")
            if len(splitted_date) != 3:
                continue
            if splitted_date[0] not in month_names:
                continue
            month = month_names.index(splitted_date[0]) + 1
            day = int(splitted_date[1].rstrip(","))
            year = int(splitted_date[2])
            if month < 1 or month > 12 or day < 1 or day > 31:
                continue
            print(f"{year:04}-{month:02}-{day:02}")
            break


if __name__ == "__main__":
    main()

How to Test

1. Run the program as mentioned in the "How to Run the Program" section.
2. Follow the prompts to enter various dates in both supported formats.
3. After processing the input, the program will display the inputted date in the standard YYYY-MM-DD format.

Sample Test Cases

1. Input:

   9/8/1636
   

   Result:

   1636-09-08
   

2. Input:

   September 8, 1636
   

   Result:

   1636-09-08
   

3. Input:

   23/6/1912
   

   Result: (The program will prompt for input again)

4. Input:

   December 80, 1980
   

   Result: (The program will prompt for input again)

Additional Notes

Make sure to save the outdated.py file in the same directory where you are running the program. If you encounter any issues with the program not being found or not running as expected, ensure you are in the correct directory and have saved the file with the correct name.