Outdated

def main():
    months = {
        "January": 1, "February": 2, "March": 3, "April": 4,
        "May": 5, "June": 6, "July": 7, "August": 8,
        "September": 9, "October": 10, "November": 11, "December": 12
    }

    while True:
        try:
            date = input("Date: ").strip()

            # Format: MM/DD/YYYY
            if "/" in date:
                parts = date.split("/")
                if len(parts) != 3:
                    raise ValueError
                month, day, year = map(int, parts)

            # Format: Month D, YYYY
            elif "," in date:
                month_day, year = date.split(",")
                month_name, day = month_day.strip().split(" ")
                month = months.get(month_name)
                if month is None:
                    raise ValueError
                day = int(day)
                year = int(year.strip())

            else:
                raise ValueError

            # Validate basic bounds
            if not (1 <= month <= 12 and 1 <= day <= 31):
                raise ValueError

            # Print ISO format
            print(f"{year:04}-{month:02}-{day:02}")
            break

        except ValueError:
            continue  # Reprompt on bad input

if __name__ == "__main__":
    main()