Please add a better explanation about date format, i can`t realize that year can be less than 1000 until i do my attempt.

You need to add sample test case and some random test cases in javascript version.

From the the last sentence of description i understand that we are always have an square matrix, then when i do my attempt i realized that can be rectangular.
Also would be useful to add some sample tests.

You need to add some random test cases

Thanks

I feel that something is missing, it need something more to be a kata, but i don't know what.

i think you must remove the explanation about remainder operator (%) use in the description.

You need some random test cases.

Youn need to add tests for large numbers

Javascript version of Kata should include more test cases, better if are random