What problem occurred in this valid date c programme

Question

https://code.sololearn.com/cF2XTke52Jq8/?ref=app

Answer 1

Here is your code made to work.

https://code.sololearn.com/cwwZ1wtiQyoW/?ref=app

Pleae try to write your code more neatly

Answer 2

It is always showing invalid date????

Answer 3

You can try my response now. For date 15/03/1999 it outputs valid date