That's an extremely weak argument. Ultimately, it's about the numerical values. Where you set the reference point is secondary as long as you can convert. We could also set your birthday as the zero point. I'm not a Christian and I have to live with BC/CE too. I'm not saying that there is no Eurocentric perspective or that European understanding of history is not shaped by it. But we can reflect on this and correct it. Postcolonial criticism should not go so far as to see the BC/CE system as a structural mechanism of oppression. That's just ridiculous. You'd be better off dealing with concrete economic oppression instead of peddling this Foucault/Spivak/Said nonsense! Sorry for being so blunt, but it upsets me every time. I mean, what's the alternative here? Should we switch to the Mayan calendar now so that it's not so Eurocentric? That's ridiculous. A little Hegelianism (or Laoziism, for that matter) wouldn't hurt you!