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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.
Reverse engineer a convention-breaking (C#) implicit interface. So pretty the opposite of what you would be lookign for in a kata.
Diasllowing 00:00 as a valid time is just an unecessary side-constraint (and the kata-description lacks clearness anyway).
Why do people think not naming variables or avoiding linebreaks that definitly should be there is a good practice?
Without any need you are expected to treat 0 as a special case as it lacks the spaces of all other non-negative inputs. That's pretty arbitrary and (if considered good) should at least be properly stated in the instructions.