Just for you, Phi:
Founded before September 8, 1868 > koryu
Founded on or after September 8, 1868 > gendai
Well ... yes ... but ...
Kawasaki, Japan, September 8th, 1868.
In the garden behind the dōjō.
Hiroshi: "Well, don't you think, we should found a new style? I would really like to be soke."
Daisuke: "Not today so! Not today Hiroshi san. Let's wait until tomorrow and ad a 'dō' ..."