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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.
а чё всмысле
It is clearly stated in the description that February has only 28 days as leap years are ignored...
I don't agree with the test case:
// Input: <pre style='display:inline;'>[02-29]</pre> should be invalid but was found valid.because February can has 29 days