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From the kata "There are a few assumptions we will accept the year 0, even though there is no year 0 in the Gregorian Calendar."
I'm not sure that rule applies correctly to BC dates. Not having a year 0 would offset the rule by 1 year. The correction wasn't implemented in BC and therefore any testing of it for negative dates is not valid.
This is following the rules and so will not be changed.
Leap Year Definition. A year is a leap year if it is evenly divisible by 4 but not evenly divisible by 100 unless it is also evenly divisible by 400. So 1996 was a leap year. But 1900 was not a leap year because, although it is divisible by 4, it is also divisible by 100 and not by 400. 2000 is a leap year because it is divisible by 400.
This was in the exception, Century years are NOT leap years UNLESS they can be evenly divided by 400.