"Wikipedia will tell you more than you want to know about the Islamic calendar"
*zing* (/me makes motion over the top of my head, in reference to "this guy didn't get it" or else he posted that as a way of acting a bit clueless for humor, not sure which)
I think the "another 1000 years" reference was a snide reference to the backwards thinking related to 'establishing a caliphate' and the way much of Islam treats their women (and children), and christians, and homosexuals, and basically anyone who isn't a Moslem, etc.
At least, that's how _I_ saw it (and it was funny, because it was based on the truth)