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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.
Since this kata specifically tells you to not just compare the day, it should have tests that include date objects from different timezones so that you can experience that 10 pm in the given object might be past midnight, i.e. the next day in your timezone. Most answers just compare the day and still pass.
On the other hand, then ve are not talking 8th kyu anymore...