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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Fixed. Thank you for reporting.
I fixed this kata (hopefully).
The reason this solution is now marked invalid is an off-by-one error in
while( day >= m_days_in_month[month] ).Results differ, had to hardcode test value, see comments.
My results for (1804289383) matches