But they aren’t really the same. That’s another part of the reason these other terms got invented. The church kept nudging things, maybe Christ was born this, oh wait no this, no wait this one. It’s actually the Christian world that decided it needed a way to define eras that the church couldn’t screw with.
I don’t care about AD in our laws you pointlessly insulting troll. It’s besides the point. The simple fact is people can use whatever notation they want, and nobody is forcing anybody to do anything.
Now really, grow up. The fact that you need to throw insults on this prove you know the facts don’t back you. You’re on the wrong horse. And you know it, but you’re too stubborn to admit it. So you stamp your feet like a child.