Board Thread:General Discussion/@comment-1526346-20170916141829/@comment-9605025-20170917202104

If you are looking for a clear-but answer, I think Banarama's answer makes the most sense. I don't know why Wikipedia uses that format but it would definitely have the benefit of being easily sortable even if the dates are treated as strings. I would imagine this would be desirable considering you are trying to group events by decade.

That being said, the considerations mentioned by the other users are all very good points to consider.