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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.
I have tried solving this Kata mathmetically without the JavaScript Date object, but failed miserably. Somehow dates inbetween 1850 and 2100 were fine, but anything higher or lower failed.
I wonder if my function was flawed - as I couldn't find any mistakes in it...