[It takes a few moments for Yoshitsugu to think that through, but eventually it pops into his head. It's been a while since he's interacted with any of the traders who come to Japan to sell their wares, after all... the last time was probably when Hideyoshi was still alive.]

The Western traders refer to their homeland of 'Portugal' as being part of Europe. If you are using the same calendar as they, then...

[A beat, as he works it out, then:]

I come from the year 1600, if I have it right.