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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.
description says: "Date parameter could be a string or a Date object."
A similar little error here:
NoMethodError: undefined method `match' for #
The code passes for all the following cases: '2013 12 25', '12 25 1950', '25 December 1875', '2012 12 25', '2019 12 25'.