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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.
Hi LogaJ, you shouldn't make any assumptions, because kata description clearly states: "Date parameter could be a string or a Date object."
It looks like your code is minipulating the original instances and changing their values around, which was causing the specs to act weird. I've updated the kata to include an initial test case example, so that you can see how the tests are setup.
This is strange. The tests seem to be OK but that error message definitely is not correct. Would you mind adding your solution here and marking it as a spoiler?