Hmm, I suppose it is, in a way. The system has been up and running for 365 days. But 365 days ago reddit was in the middle of getting bought, and we didn't want to freak out Conde Nast. So the site wasn't launched till Feb 07.
Yeah after I posted this I got to searching around and found the post that said the 6 month mark was August 20th... So I guess the go-public birthday is probably more like February 20th.