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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.
Using datetime can be problematic because it's the name of both the package and the class.
I'd suggest you try:
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
From the description:
I assume that means that the resulting incremented number should have the same amount of digits.
It's easy to miss details like that.