Well, really we should use the World Calendar, as specified by the League of Nations, or the Hijri since we&#x27;re discussing Islam, or good &#x27;ol ISO 8601 as this is Hacker News.<p>Heh, yeah, it all does become a little silly.<p>The important thing is communication. Using Christian dates is needlessly upsetting when discussing world religions. Upsetting people disrupts communication, so I avoid it.