Question

Decisions, decisions, decisions. Computers are terrible at them, so as programmers we need to instruct them on how to make good ones. In this lab you will write a program that accepts a date in the form “month/day/year” and prints whether or not the date is valid. For example 5/24/1962 is valid, but 9/31/2000 is not. (September has only 30 days.)

Your program, in order to be correct, should be able to pass these simple (but far from complete!) test cases:

2/29/2000 — (valid)

2/29/2001 — (not valid)

4/30/1984 — (valid)

4/31/1984 — (not valid)

0/12/1234 — (not valid)

13/30/2014 — (not valid)

10/24/2014 — (valid)

It is okay with you allowing leading zeros for the month, or day. This is optional, however.

03/04/2017 — (valid)

07/22/2019 — (valid)

00/12/1234 — (not valid)

Generally speaking, I want to see the following structure in your program. This encourages “separation of concerns”:

1. Obviously, you will be using if-elif-else statements to make decisions in your program.

2. The function main() should print a friendly message and ask for the input of the date in the required format (see above). It then should parse the date into its day, month and year components. It will pass this information to a “date check” function.

3. A “date check” function named is_valid_date(day, month, year) that will take these date components of day, month and year and checks to see if that date is valid.

   The function parameters day, month, and year must be integer values. This function is required to return a Python True or False boolean value (reflecting a valid, or invalid date, respectively) that your main() function will use to print out the correct message about the date’s validity.

4. A function named is_leap_year(year) that calculates leap year needs to be used by your date check function. This formula should be easy to look up.

   The function parameters year must be an integer value. You need to write this function that takes takes a year as a parameter that will then return a Python True or False boolean value (reflecting a leap, or non-leap year, respectively).

Output

Sample output looks like:

This program accepts a date in the form month/day/year and outputs whether or not the date is valid
Please enter a date (mm/dd/yyyy): 2/29/2000
2/29/2000 is valid

or

This program accepts a date in the form month/day/year and outputs whether or not the date is valid
Please enter a date (mm/dd/yyyy): 4/31/1984
4/31/1984 is not valid

Answer 1

PLEASE GIVE IT A THUMBS UP, I SERIOUSLY NEED ONE, IF YOU NEED ANY MODIFICATION THEN LET ME KNOW, I WILL DO IT FOR YOU

def is_leap_year(y):
    if (y % 100 != 0 and y % 400 != 0) or (y % 4 != 0):
        return False
    return True

def is_valid_date(d, m, y):
    if m < 1 or m > 12:
        return False
    if d < 1 or d > 31:
        return False
    if (m == 4 or m == 6 or m == 9 or m == 11) and (d == 31):
        return False
    if m == 2 and d > 28 and (is_leap_year(y)==False):
        return False
    return True


def date_check(l):
    line = l.split("/")
    if len(line) != 3:
        return False
    m = int(line[0])
    d = int(line[1])
    y = int(line[2])
    if(is_valid_date(d,m,y)):
        return True
    return False


def Main():
    print("This program accepts a date in the form month/day/year and outputs whether or not the date is valid")
    date = input("Please enter a date (mm/dd/yyyy):")
    if (date_check(date)):
        print(date + " is valid")
    else:
        print(date + " is not valid")
    


Main()