Solution for the "Date Validation" python coding challenge?

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30mtuckowski

2025. október 9. 18:42

I'm having an issue with the Date Validation challenge in the Intro to Comp. Sci. course.

I'm stuck on the last step, getting a message that says "You changed your code in an unexpected way." I've already tried starting over, but I got the error message again. Can anyone help?

Code is as follows:

day = int(input("Enter a day (1-31): "))
if day < 1 or day > 31:
print("Error. Day must be between 1 and 31.")

month = int(input("Enter a month (1-12): "))

year = int(input("Enter a year: "))

if month < 1 or month > 12:
print("Error. Month must be between 1 and 12.")

if month == 6 and day > 30 or month == 4 and day > 30 or month == 9 and day > 30 or month == 11 and day > 30:
print("Error. Day must be within the month.")

if year <= 999 or year >= 9999:
print("Error. Year must have four digits.")

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JaniceHolz

2025. október 11. 8:56

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I see two unusual things in your code.

`if month == 6 and day > 30 or month == 4 and day > 30 or month == 9 and day > 30 or month == 11 and day > 30:`
is very long. It would be much shorter to combine it as
`if (month == 6 or month == 4 or month == 9 or month == 11) and day > 30:`

`if year <= 999 or year >= 9999:`
is wrong; that will print the error message when year = 9999, even though that is a 4-digit year.
If you change it to
`if year <= 999 or year > 9999:` (or `if year < 1000 or year > 9999:`)
then I think you will pass the challenge.

~ Janice

P.S. I think you will probably get help faster by posting a Question below the video or article preceding the Challenge. I'm happy to share the trick for how to keep leading spaces when posting in the discussion section.
30mtuckowski

2025. október 27. 18:17
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Thank you so much! I completely forgot about posting questions on videos lol. The program worked perfectly! Sorry about not responding earlier.

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Solution for the "Date Validation" python coding challenge?

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