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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.
The random tests are using ancient time periods which requires arcane knowledge about all the documented time zone and clock changes, which is, obviously, library-dependent, hence implicitly forcing a specific library to be used in the solution.
Also, testing times in far future is even more dangerous: we do not know the possible timezone changes in the future, hence even the currently used library will be suspect (unless it can keep updating the time adjustments till eternity).