[quote=@DarkwolfX37]
<Snipped quote by Etcetera>

Actually for historians. Nobody uses it commonly other than people who looked into it. (Example: me) I've yet to meet another person who knew about the change personally.
[/quote]

I knew about it when I was quite a bit younger--I was reading a history book and it mentioned those time periods, so I searched about it. It's surprising all the random useful things I picked up when I was little.